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• spring security : Failed to load ApplicationContext with pre-post-annotations="enabled"

  - by thogau

  I am using spring 3.0.1 + spring-security 3.0.2 and I am trying to use features like @PreAuthorize and @PostFilter annotations. When running in units tests using @RunWith(SpringJUnit4ClassRunner.class) or in a main(String[] args) method my application context fails to start if enable pre-post-annotations and use org.springframework.security.acls.AclPermissionEvaluator : <!-- Enable method level security--> <security:global-method-security pre-post-annotations="enabled"> <security:expression-handler ref="expressionHandler"/> </security:global-method-security> <bean id="expressionHandler" class="org.springframework.security.access.expression.method.DefaultMethodSecurityExpressionHandler"> <property name="permissionEvaluator" ref="aclPermissionEvaluator"/> </bean> <bean id="aclPermissionEvaluator" class="org.springframework.security.acls.AclPermissionEvaluator"> <constructor-arg ref="aclService"/> </bean> <!-- Enable stereotype support --> <context:annotation-config /> <context:component-scan base-package="com.rreps.core" /> <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <list> <value>classpath:applicationContext.properties</value> </list> </property> </bean> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc.driver}" /> <property name="jdbcUrl" value="${jdbc.url}" /> <property name="user" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <property name="initialPoolSize" value="10" /> <property name="minPoolSize" value="5" /> <property name="maxPoolSize" value="25" /> <property name="acquireRetryAttempts" value="10" /> <property name="acquireIncrement" value="5" /> <property name="idleConnectionTestPeriod" value="3600" /> <property name="maxIdleTime" value="10800" /> <property name="maxConnectionAge" value="14400" /> <property name="preferredTestQuery" value="SELECT 1;" /> <property name="testConnectionOnCheckin" value="false" /> </bean> <bean id="auditedSessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="configLocation" value="classpath:hibernate.cfg.xml" /> <property name="hibernateProperties"> <value> hibernate.dialect=${hibernate.dialect} hibernate.query.substitutions=true 'Y', false 'N' hibernate.cache.use_second_level_cache=true hibernate.cache.provider_class=net.sf.ehcache.hibernate.SingletonEhCacheProvider hibernate.hbm2ddl.auto=update hibernate.c3p0.acquire_increment=5 hibernate.c3p0.idle_test_period=3600 hibernate.c3p0.timeout=10800 hibernate.c3p0.max_size=25 hibernate.c3p0.min_size=1 hibernate.show_sql=false hibernate.validator.autoregister_listeners=false </value> </property> <!-- validation is performed by "hand" (see http://opensource.atlassian.com/projects/hibernate/browse/HV-281) <property name="eventListeners"> <map> <entry key="pre-insert" value-ref="beanValidationEventListener" /> <entry key="pre-update" value-ref="beanValidationEventListener" /> </map> </property> --> <property name="entityInterceptor"> <bean class="com.rreps.core.dao.hibernate.interceptor.TrackingInterceptor" /> </property> </bean> <bean id="simpleSessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="configLocation" value="classpath:hibernate.cfg.xml" /> <property name="hibernateProperties"> <value> hibernate.dialect=${hibernate.dialect} hibernate.query.substitutions=true 'Y', false 'N' hibernate.cache.use_second_level_cache=true hibernate.cache.provider_class=net.sf.ehcache.hibernate.SingletonEhCacheProvider hibernate.hbm2ddl.auto=update hibernate.c3p0.acquire_increment=5 hibernate.c3p0.idle_test_period=3600 hibernate.c3p0.timeout=10800 hibernate.c3p0.max_size=25 hibernate.c3p0.min_size=1 hibernate.show_sql=false hibernate.validator.autoregister_listeners=false </value> </property> <!-- property name="eventListeners"> <map> <entry key="pre-insert" value-ref="beanValidationEventListener" /> <entry key="pre-update" value-ref="beanValidationEventListener" /> </map> </property--> </bean> <bean id="sequenceSessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="configLocation" value="classpath:hibernate.cfg.xml" /> <property name="hibernateProperties"> <value> hibernate.dialect=${hibernate.dialect} hibernate.query.substitutions=true 'Y', false 'N' hibernate.cache.use_second_level_cache=true hibernate.cache.provider_class=net.sf.ehcache.hibernate.SingletonEhCacheProvider hibernate.hbm2ddl.auto=update hibernate.c3p0.acquire_increment=5 hibernate.c3p0.idle_test_period=3600 hibernate.c3p0.timeout=10800 hibernate.c3p0.max_size=25 hibernate.c3p0.min_size=1 hibernate.show_sql=false hibernate.validator.autoregister_listeners=false </value> </property> </bean> <bean id="validationFactory" class="javax.validation.Validation" factory-method="buildDefaultValidatorFactory" /> <!-- bean id="beanValidationEventListener" class="org.hibernate.cfg.beanvalidation.BeanValidationEventListener"> <constructor-arg index="0" ref="validationFactory" /> <constructor-arg index="1"> <props/> </constructor-arg> </bean--> <!-- Enable @Transactional support --> <tx:annotation-driven transaction-manager="transactionManager"/> <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="auditedSessionFactory" /> </bean> <security:authentication-manager alias="authenticationManager"> <security:authentication-provider user-service-ref="userDetailsService" /> </security:authentication-manager> <bean id="userDetailsService" class="com.rreps.core.service.impl.UserDetailsServiceImpl" /> <!-- ACL stuff --> <bean id="aclCache" class="org.springframework.security.acls.domain.EhCacheBasedAclCache"> <constructor-arg> <bean class="org.springframework.cache.ehcache.EhCacheFactoryBean"> <property name="cacheManager"> <bean class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"/> </property> <property name="cacheName" value="aclCache"/> </bean> </constructor-arg> </bean> <bean id="lookupStrategy" class="org.springframework.security.acls.jdbc.BasicLookupStrategy"> <constructor-arg ref="dataSource"/> <constructor-arg ref="aclCache"/> <constructor-arg> <bean class="org.springframework.security.acls.domain.AclAuthorizationStrategyImpl"> <constructor-arg> <list> <bean class="org.springframework.security.core.authority.GrantedAuthorityImpl"> <constructor-arg value="ROLE_ADMINISTRATEUR"/> </bean> <bean class="org.springframework.security.core.authority.GrantedAuthorityImpl"> <constructor-arg value="ROLE_ADMINISTRATEUR"/> </bean> <bean class="org.springframework.security.core.authority.GrantedAuthorityImpl"> <constructor-arg value="ROLE_ADMINISTRATEUR"/> </bean> </list> </constructor-arg> </bean> </constructor-arg> <constructor-arg> <bean class="org.springframework.security.acls.domain.ConsoleAuditLogger"/> </constructor-arg> </bean> <bean id="aclService" class="com.rreps.core.service.impl.MysqlJdbcMutableAclService"> <constructor-arg ref="dataSource"/> <constructor-arg ref="lookupStrategy"/> <constructor-arg ref="aclCache"/> </bean> The strange thing is that the context starts normally when deployed in a webapp and @PreAuthorize and @PostFilter annotations are working fine as well... Any idea what is wrong? Here is the end of the stacktrace : ... 55 more Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [applicationContext-core.xml]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.transaction.config.internalTransactionAdvisor': Cannot resolve reference to bean 'org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0' while setting bean property 'transactionAttributeSource'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0': Initialization of bean failed; nested exception is java.lang.NullPointerException at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:450) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:290) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:287) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:189) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:322) ... 67 more Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.transaction.config.internalTransactionAdvisor': Cannot resolve reference to bean 'org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0' while setting bean property 'transactionAttributeSource'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0': Initialization of bean failed; nested exception is java.lang.NullPointerException at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:328) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:106) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1308) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1067) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:511) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:450) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:290) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:287) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) at org.springframework.aop.framework.autoproxy.BeanFactoryAdvisorRetrievalHelper.findAdvisorBeans(BeanFactoryAdvisorRetrievalHelper.java:86) at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findCandidateAdvisors(AbstractAdvisorAutoProxyCreator.java:100) at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findEligibleAdvisors(AbstractAdvisorAutoProxyCreator.java:86) at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.getAdvicesAndAdvisorsForBean(AbstractAdvisorAutoProxyCreator.java:68) at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:359) at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:322) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:404) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1409) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ... 73 more Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0': Initialization of bean failed; nested exception is java.lang.NullPointerException at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:450) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:290) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:287) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:189) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:322) ... 91 more Caused by: java.lang.NullPointerException at org.springframework.security.access.method.DelegatingMethodSecurityMetadataSource.getAttributes(DelegatingMethodSecurityMetadataSource.java:52) at org.springframework.security.access.intercept.aopalliance.MethodSecurityMetadataSourceAdvisor$MethodSecurityMetadataSourcePointcut.matches(MethodSecurityMetadataSourceAdvisor.java:129) at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:215) at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:252) at org.springframework.aop.support.AopUtils.findAdvisorsThatCanApply(AopUtils.java:284) at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findAdvisorsThatCanApply(AbstractAdvisorAutoProxyCreator.java:117) at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findEligibleAdvisors(AbstractAdvisorAutoProxyCreator.java:87) at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.getAdvicesAndAdvisorsForBean(AbstractAdvisorAutoProxyCreator.java:68) at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:359) at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:322) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:404) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1409) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ... 97 more

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• DropDownList and SelectListItem Array Item Updates in MVC

  - by Rick Strahl

  So I ran into an interesting behavior today as I deployed my first MVC 4 app tonight. I have a list form that has a filter drop down that allows selection of categories. This list is static and rarely changes so rather than loading these items from the database each time I load the items once and then cache the actual SelectListItem[] array in a static property. However, when we put the site online tonight we immediately noticed that the drop down list was coming up with pre-set values that randomly changed. Didn't take me long to trace this back to the cached list of SelectListItem[]. Clearly the list was getting updated - apparently through the model binding process in the selection postback. To clarify the scenario here's the drop down list definition in the Razor View:@Html.DropDownListFor(mod => mod.QueryParameters.Category, Model.CategoryList, "All Categories") where Model.CategoryList gets set with:[HttpPost] [CompressContent] public ActionResult List(MessageListViewModel model) { InitializeViewModel(model); busEntry entryBus = new busEntry(); var entries = entryBus.GetEntryList(model.QueryParameters); model.Entries = entries; model.DisplayMode = ApplicationDisplayModes.Standard; model.CategoryList = AppUtils.GetCachedCategoryList(); return View(model); } The AppUtils.GetCachedCategoryList() method gets the cached list or loads the list on the first access. The code to load up the list is housed in a Web utility class. The method looks like this:/// <summary> /// Returns a static category list that is cached /// </summary> /// <returns></returns> public static SelectListItem[] GetCachedCategoryList() { if (_CategoryList != null) return _CategoryList; lock (_SyncLock) { if (_CategoryList != null) return _CategoryList; var catBus = new busCategory(); var categories = catBus.GetCategories().ToList(); // Turn list into a SelectItem list var catList= categories .Select(cat => new SelectListItem() { Text = cat.Name, Value = cat.Id.ToString() }) .ToList(); catList.Insert(0, new SelectListItem() { Value = ((int)SpecialCategories.AllCategoriesButRealEstate).ToString(), Text = "All Categories except Real Estate" }); catList.Insert(1, new SelectListItem() { Value = "-1", Text = "--------------------------------" }); _CategoryList = catList.ToArray(); } return _CategoryList; } private static SelectListItem[] _CategoryList ; This seemed normal enough to me - I've been doing stuff like this forever caching smallish lists in memory to avoid an extra trip to the database. This list is used in various places throughout the application - for the list display and also when adding new items and setting up for notifications etc.. Watch that ModelBinder! However, it turns out that this code is clearly causing a problem. It appears that the model binder on the [HttpPost] method is actually updating the list that's bound to and changing the actual entry item in the list and setting its selected value. If you look at the code above I'm not setting the SelectListItem.Selected value anywhere - the only place this value can get set is through ModelBinding. Sure enough when stepping through the code I see that when an item is selected the actual model - model.CategoryList[x].Selected - reflects that. This is bad on several levels: First it's obviously affecting the application behavior - nobody wants to see their drop down list values jump all over the place randomly. But it's also a problem because the array is getting updated by multiple ASP.NET threads which likely would lead to odd crashes from time to time. Not good! In retrospect the modelbinding behavior makes perfect sense. The actual items and the Selected property is the ModelBinder's way of keeping track of one or more selected values. So while I assumed the list to be read-only, the ModelBinder is actually updating it on a post back producing the rather surprising results. Totally missed this during testing and is another one of those little - "Did you know?" moments. So, is there a way around this? Yes but it's maybe not quite obvious. I can't change the behavior of the ModelBinder, but I can certainly change the way that the list is generated. Rather than returning the cached list, I can return a brand new cloned list from the cached items like this:/// <summary> /// Returns a static category list that is cached /// </summary> /// <returns></returns> public static SelectListItem[] GetCachedCategoryList() { if (_CategoryList != null) { // Have to create new instances via projection // to avoid ModelBinding updates to affect this // globally return _CategoryList .Select(cat => new SelectListItem() { Value = cat.Value, Text = cat.Text }) .ToArray(); } …}  The key is that newly created instances of SelectListItems are returned not just filtered instances of the original list. The key here is 'new instances' so that the ModelBinding updates do not update the actual static instance. The code above uses LINQ and a projection into new SelectListItem instances to create this array of fresh instances. And this code works correctly - no more cross-talk between users. Unfortunately this code is also less efficient - it has to reselect the items and uses extra memory for the new array. Knowing what I know now I probably would have not cached the list and just take the hit to read from the database. If there is even a possibility of thread clashes I'm very wary of creating code like this. But since the method already exists and handles this load in one place this fix was easy enough to put in. Live and learn. It's little things like this that can cause some interesting head scratchers sometimes…© Rick Strahl, West Wind Technologies, 2005-2012Posted in MVC  ASP.NET  .NET   Tweet !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();

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• Securing an ASP.NET MVC 2 Application

  - by rajbk

  This post attempts to look at some of the methods that can be used to secure an ASP.NET MVC 2 Application called Northwind Traders Human Resources.  The sample code for the project is attached at the bottom of this post. We are going to use a slightly modified Northwind database. The screen capture from SQL server management studio shows the change. I added a new column called Salary, inserted some random salaries for the employees and then turned off AllowNulls.   The reporting relationship for Northwind Employees is shown below.   The requirements for our application are as follows: Employees can see their LastName, FirstName, Title, Address and Salary Employees are allowed to edit only their Address information Employees can see the LastName, FirstName, Title, Address and Salary of their immediate reports Employees cannot see records of non immediate reports.  Employees are allowed to edit only the Salary and Title information of their immediate reports. Employees are not allowed to edit the Address of an immediate report Employees should be authenticated into the system. Employees by default get the “Employee” role. If a user has direct reports, they will also get assigned a “Manager” role. We use a very basic empId/pwd scheme of EmployeeID (1-9) and password test$1. You should never do this in an actual application. The application should protect from Cross Site Request Forgery (CSRF). For example, Michael could trick Steven, who is already logged on to the HR website, to load a page which contains a malicious request. where without Steven’s knowledge, a form on the site posts information back to the Northwind HR website using Steven’s credentials. Michael could use this technique to give himself a raise :-) UI Notes The layout of our app looks like so: When Nancy (EmpID 1) signs on, she sees the default page with her details and is allowed to edit her address. If Nancy attempts to view the record of employee Andrew who has an employeeID of 2 (Employees/Edit/2), she will get a “Not Authorized” error page. When Andrew (EmpID 2) signs on, he can edit the address field of his record and change the title and salary of employees that directly report to him. Implementation Notes All controllers inherit from a BaseController. The BaseController currently only has error handling code. When a user signs on, we check to see if they are in a Manager role. We then create a FormsAuthenticationTicket, encrypt it (including the roles that the employee belongs to) and add it to a cookie. private void SetAuthenticationCookie(int employeeID, List<string> roles) { HttpCookiesSection cookieSection = (HttpCookiesSection) ConfigurationManager.GetSection("system.web/httpCookies"); AuthenticationSection authenticationSection = (AuthenticationSection) ConfigurationManager.GetSection("system.web/authentication"); FormsAuthenticationTicket authTicket = new FormsAuthenticationTicket( 1, employeeID.ToString(), DateTime.Now, DateTime.Now.AddMinutes(authenticationSection.Forms.Timeout.TotalMinutes), false, string.Join("|", roles.ToArray())); String encryptedTicket = FormsAuthentication.Encrypt(authTicket); HttpCookie authCookie = new HttpCookie(FormsAuthentication.FormsCookieName, encryptedTicket); if (cookieSection.RequireSSL || authenticationSection.Forms.RequireSSL) { authCookie.Secure = true; } HttpContext.Current.Response.Cookies.Add(authCookie); } We read this cookie back in Global.asax and set the Context.User to be a new GenericPrincipal with the roles we assigned earlier. protected void Application_AuthenticateRequest(Object sender, EventArgs e){ if (Context.User != null) { string cookieName = FormsAuthentication.FormsCookieName; HttpCookie authCookie = Context.Request.Cookies[cookieName]; if (authCookie == null) return; FormsAuthenticationTicket authTicket = FormsAuthentication.Decrypt(authCookie.Value); string[] roles = authTicket.UserData.Split(new char[] { '|' }); FormsIdentity fi = (FormsIdentity)(Context.User.Identity); Context.User = new System.Security.Principal.GenericPrincipal(fi, roles); }} We ensure that a user has permissions to view a record by creating a custom attribute AuthorizeToViewID that inherits from ActionFilterAttribute. public class AuthorizeToViewIDAttribute : ActionFilterAttribute{ IEmployeeRepository employeeRepository = new EmployeeRepository(); public override void OnActionExecuting(ActionExecutingContext filterContext) { if (filterContext.ActionParameters.ContainsKey("id") && filterContext.ActionParameters["id"] != null) { if (employeeRepository.IsAuthorizedToView((int)filterContext.ActionParameters["id"])) { return; } } throw new UnauthorizedAccessException("The record does not exist or you do not have permission to access it"); }} We add the AuthorizeToView attribute to any Action method that requires authorization. [HttpPost][Authorize(Order = 1)]//To prevent CSRF[ValidateAntiForgeryToken(Salt = Globals.EditSalt, Order = 2)]//See AuthorizeToViewIDAttribute class[AuthorizeToViewID(Order = 3)] [ActionName("Edit")]public ActionResult Update(int id){ var employeeToEdit = employeeRepository.GetEmployee(id); if (employeeToEdit != null) { //Employees can edit only their address //A manager can edit the title and salary of their subordinate string[] whiteList = (employeeToEdit.IsSubordinate) ? new string[] { "Title", "Salary" } : new string[] { "Address" }; if (TryUpdateModel(employeeToEdit, whiteList)) { employeeRepository.Save(employeeToEdit); return RedirectToAction("Details", new { id = id }); } else { ModelState.AddModelError("", "Please correct the following errors."); } } return View(employeeToEdit);} The Authorize attribute is added to ensure that only authorized users can execute that Action. We use the TryUpdateModel with a white list to ensure that (a) an employee is able to edit only their Address and (b) that a manager is able to edit only the Title and Salary of a subordinate. This works in conjunction with the AuthorizeToViewIDAttribute. The ValidateAntiForgeryToken attribute is added (with a salt) to avoid CSRF. The Order on the attributes specify the order in which the attributes are executed. The Edit View uses the AntiForgeryToken helper to render the hidden token: ......<% using (Html.BeginForm()) {%><%=Html.AntiForgeryToken(NorthwindHR.Models.Globals.EditSalt)%><%= Html.ValidationSummary(true, "Please correct the errors and try again.") %><div class="editor-label"> <%= Html.LabelFor(model => model.LastName) %></div><div class="editor-field">...... The application uses View specific models for ease of model binding. public class EmployeeViewModel{ public int EmployeeID; [Required] [DisplayName("Last Name")] public string LastName { get; set; } [Required] [DisplayName("First Name")] public string FirstName { get; set; } [Required] [DisplayName("Title")] public string Title { get; set; } [Required] [DisplayName("Address")] public string Address { get; set; } [Required] [DisplayName("Salary")] [Range(500, double.MaxValue)] public decimal Salary { get; set; } public bool IsSubordinate { get; set; }} To help with displaying readonly/editable fields, we use a helper method. //Simple extension method to display a TextboxFor or DisplayFor based on the isEditable variablepublic static MvcHtmlString TextBoxOrLabelFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, bool isEditable){ if (isEditable) { return htmlHelper.TextBoxFor(expression); } else { return htmlHelper.DisplayFor(expression); }} The helper method is used in the view like so: <%=Html.TextBoxOrLabelFor(model => model.Title, Model.IsSubordinate)%> As mentioned in this post, there is a much easier way to update properties on an object. Download Demo Project VS 2008, ASP.NET MVC 2 RTM Remember to change the connectionString to point to your Northwind DB NorthwindHR.zip Feedback and bugs are always welcome :-)

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• Validation in Silverlight

  - by Timmy Kokke

  Getting started with the basics Validation in Silverlight can get very complex pretty easy. The DataGrid control is the only control that does data validation automatically, but often you want to validate your own entry form. Values a user may enter in this form can be restricted by the customer and have to fit an exact fit to a list of requirements or you just want to prevent problems when saving the data to the database. Showing a message to the user when a value is entered is pretty straight forward as I’ll show you in the following example.     This (default) Silverlight textbox is data-bound to a simple data class. It has to be bound in “Two-way” mode to be sure the source value is updated when the target value changes. The INotifyPropertyChanged interface must be implemented by the data class to get the notification system to work. When the property changes a simple check is performed and when it doesn’t match some criteria an ValidationException is thrown. The ValidatesOnExceptions binding attribute is set to True to tell the textbox it should handle the thrown ValidationException. Let’s have a look at some code now. The xaml should contain something like below. The most important part is inside the binding. In this case the Text property is bound to the “Name” property in TwoWay mode. It is also told to validate on exceptions. This property is false by default.   <StackPanel Orientation="Horizontal"> <TextBox Width="150" x:Name="Name" Text="{Binding Path=Name, Mode=TwoWay, ValidatesOnExceptions=True}"/> <TextBlock Text="Name"/> </StackPanel>   The data class in this first example is a very simplified person class with only one property: string Name. The INotifyPropertyChanged interface is implemented and the PropertyChanged event is fired when the Name property changes. When the property changes a check is performed to see if the new string is null or empty. If this is the case a ValidationException is thrown explaining that the entered value is invalid.   public class PersonData:INotifyPropertyChanged { private string _name; public string Name { get { return _name; } set { if (_name != value) { if(string.IsNullOrEmpty(value)) throw new ValidationException("Name is required"); _name = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("Name")); } } } public event PropertyChangedEventHandler PropertyChanged=delegate { }; } The last thing that has to be done is letting binding an instance of the PersonData class to the DataContext of the control. This is done in the code behind file. public partial class Demo1 : UserControl { public Demo1() { InitializeComponent(); this.DataContext = new PersonData() {Name = "Johnny Walker"}; } }   Error Summary In many cases you would have more than one entry control. A summary of errors would be nice in such case. With a few changes to the xaml an error summary, like below, can be added.           First, add a namespace to the xaml so the control can be used. Add the following line to the header of the .xaml file. xmlns:Controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.Input"   Next, add the control to the layout. To get the result as in the image showed earlier, add the control right above the StackPanel from the first example. It’s got a small margin to separate it from the textbox a little.   <Controls:ValidationSummary Margin="8"/>   The ValidationSummary control has to be notified that an ValidationException occurred. This can be done with a small change to the xaml too. Add the NotifyOnValidationError to the binding expression. By default this value is set to false, so nothing would be notified. Set the property to true to get it to work.   <TextBox Width="150" x:Name="Name" Text="{Binding Name, Mode=TwoWay, ValidatesOnExceptions=True, NotifyOnValidationError=True}"/>   Data annotation Validating data in the setter is one option, but not my personal favorite. It’s the easiest way if you have a single required value you want to check, but often you want to validate more. Besides, I don’t consider it best practice to write logic in setters. The way used by frameworks like WCF Ria Services is the use of attributes on the properties. Instead of throwing exceptions you have to call the static method ValidateProperty on the Validator class. This call stays always the same for a particular property, not even when you change the attributes on the property. To mark a property “Required” you can use the RequiredAttribute. This is what the Name property is going to look like:   [Required] public string Name { get { return _name; } set { if (_name != value) { Validator.ValidateProperty(value, new ValidationContext(this, null, null){ MemberName = "Name" }); _name = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("Name")); } } }   The ValidateProperty method takes the new value for the property and an instance of ValidationContext. The properties passed to the constructor of the ValidationContextclass are very straight forward. This part is the same every time. The only thing that changes is the MemberName property of the ValidationContext. Property has to hold the name of the property you want to validate. It’s the same value you provide the PropertyChangedEventArgs with. The System.ComponentModel.DataAnnotation contains eight different validation attributes including a base class to create your own. They are: RequiredAttribute Specifies that a value must be provided. RangeAttribute The provide value must fall in the specified range. RegularExpressionAttribute Validates is the value matches the regular expression. StringLengthAttribute Checks if the number of characters in a string falls between a minimum and maximum amount. CustomValidationAttribute Use a custom method to validate the value. DataTypeAttribute Specify a data type using an enum or a custom data type. EnumDataTypeAttribute Makes sure the value is found in a enum. ValidationAttribute A base class for custom validation attributes All of these will ensure that an validation exception is thrown, except the DataTypeAttribute. This attribute is used to provide some additional information about the property. You can use this information in your own code.   [Required] [Range(0,125,ErrorMessage = "Value is not a valid age")] public int Age {   It’s no problem to stack different validation attributes together. For example, when an Age is required and must fall in the range from 0 to 125:   [Required, StringLength(255,MinimumLength = 3)] public string Name {   Or in one row like this, for a required Name with at least 3 characters and a maximum of 255:   Delayed validation Having properties marked as required can be very useful. The only downside to the technique described earlier is that you have to change the value in order to get it validated. What if you start out with empty an empty entry form? All fields are empty and thus won’t be validated. With this small trick you can validate at the moment the user click the submit button.   <TextBox Width="150" x:Name="NameField" Text="{Binding Name, Mode=TwoWay, ValidatesOnExceptions=True, NotifyOnValidationError=True, UpdateSourceTrigger=Explicit}"/>   By default, when a TwoWay bound control looses focus the value is updated. When you added validation like I’ve shown you earlier, the value is validated. To overcome this, you have to tell the binding update explicitly by setting the UpdateSourceTrigger binding property to Explicit:   private void SubmitButtonClick(object sender, RoutedEventArgs e) { NameField.GetBindingExpression(TextBox.TextProperty).UpdateSource(); }   This way, the binding is in two direction but the source is only updated, thus validated, when you tell it to. In the code behind you have to call the UpdateSource method on the binding expression, which you can get from the TextBox.   Conclusion Data validation is something you’ll probably want on almost every entry form. I always thought it was hard to do, but it wasn’t. If you can throw an exception you can do validation. If you want to know anything more in depth about something I talked about in this article let me know. I might write an entire post to that.

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• Can't run Eclipse after installing ADT Plugin

  - by user89439

  So, I've installed the ADT Plugin, run a HelloWorld, restart my computer and after that the Eclipse can't run. A message appear: "An error has ocurred. See the log file: /home/todi (...)" Here is the log file: !SESSION 2011-07-26 22:51:59.381 ----------------------------------------------- eclipse.buildId=I20110613-1736 java.version=1.6.0_26 java.vendor=Sun Microsystems Inc. BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=pt_BR Framework arguments: -product org.eclipse.epp.package.java.product Command-line arguments: -os win32 -ws win32 -arch x86 -product org.eclipse.epp.package.java.product !ENTRY org.eclipse.update.configurator 4 0 2011-07-26 22:57:34.135 !MESSAGE Could not rename configuration temp file !ENTRY org.eclipse.update.configurator 4 0 2011-07-26 22:57:34.157 !MESSAGE Unable to save configuration file "C:\Program Files\eclipse\configuration\org.eclipse.update\platform.xml.tmp" !STACK 0 java.io.IOException: Unable to save configuration file "C:\Program Files\eclipse\configuration\org.eclipse.update\platform.xml.tmp" at org.eclipse.update.internal.configurator.PlatformConfiguration.save(PlatformConfiguration.java:690) at org.eclipse.update.internal.configurator.PlatformConfiguration.save(PlatformConfiguration.java:574) at org.eclipse.update.internal.configurator.PlatformConfiguration.startup(PlatformConfiguration.java:714) at org.eclipse.update.internal.configurator.ConfigurationActivator.getPlatformConfiguration(ConfigurationActivator.java:404) at org.eclipse.update.internal.configurator.ConfigurationActivator.initialize(ConfigurationActivator.java:136) at org.eclipse.update.internal.configurator.ConfigurationActivator.start(ConfigurationActivator.java:69) at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:711) at java.security.AccessController.doPrivileged(Native Method) at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:702) at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:683) at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381) at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:299) at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:440) at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:268) at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:462) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216) at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:400) at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:476) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107) at java.lang.ClassLoader.loadClass(Unknown Source) at org.eclipse.osgi.internal.loader.BundleLoader.loadClass(BundleLoader.java:345) at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:229) at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1207) at org.eclipse.equinox.internal.ds.model.ServiceComponent.createInstance(ServiceComponent.java:480) at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.createInstance(ServiceComponentProp.java:271) at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.build(ServiceComponentProp.java:332) at org.eclipse.equinox.internal.ds.InstanceProcess.buildComponent(InstanceProcess.java:588) at org.eclipse.equinox.internal.ds.ServiceReg.getService(ServiceReg.java:53) at org.eclipse.osgi.internal.serviceregistry.ServiceUse$1.run(ServiceUse.java:138) at java.security.AccessController.doPrivileged(Native Method) at org.eclipse.osgi.internal.serviceregistry.ServiceUse.getService(ServiceUse.java:136) at org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:468) at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.getService(ServiceRegistry.java:467) at org.eclipse.osgi.framework.internal.core.BundleContextImpl.getService(BundleContextImpl.java:594) at org.osgi.util.tracker.ServiceTracker.addingService(ServiceTracker.java:450) at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:980) at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:1) at org.osgi.util.tracker.AbstractTracked.trackAdding(AbstractTracked.java:262) at org.osgi.util.tracker.AbstractTracked.trackInitial(AbstractTracked.java:185) at org.osgi.util.tracker.ServiceTracker.open(ServiceTracker.java:348) at org.osgi.util.tracker.ServiceTracker.open(ServiceTracker.java:283) at org.eclipse.core.internal.runtime.InternalPlatform.getBundleGroupProviders(InternalPlatform.java:225) at org.eclipse.core.runtime.Platform.getBundleGroupProviders(Platform.java:1261) at org.eclipse.ui.internal.ide.IDEWorkbenchPlugin.getFeatureInfos(IDEWorkbenchPlugin.java:291) at org.eclipse.ui.internal.ide.WorkbenchActionBuilder.makeFeatureDependentActions(WorkbenchActionBuilder.java:1217) at org.eclipse.ui.internal.ide.WorkbenchActionBuilder.makeActions(WorkbenchActionBuilder.java:1026) at org.eclipse.ui.application.ActionBarAdvisor.fillActionBars(ActionBarAdvisor.java:147) at org.eclipse.ui.internal.ide.WorkbenchActionBuilder.fillActionBars(WorkbenchActionBuilder.java:341) at org.eclipse.ui.internal.WorkbenchWindow.fillActionBars(WorkbenchWindow.java:3564) at org.eclipse.ui.internal.WorkbenchWindow.(WorkbenchWindow.java:419) at org.eclipse.ui.internal.tweaklets.Workbench3xImplementation.createWorkbenchWindow(Workbench3xImplementation.java:31) at org.eclipse.ui.internal.Workbench.newWorkbenchWindow(Workbench.java:1920) at org.eclipse.ui.internal.Workbench.access$14(Workbench.java:1918) at org.eclipse.ui.internal.Workbench$68.runWithException(Workbench.java:3658) at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4140) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757) at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803) at org.eclipse.ui.internal.Workbench$33.runWithException(Workbench.java:1595) at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4140) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410) !ENTRY org.eclipse.equinox.p2.operations 4 0 2011-07-27 00:15:28.049 !MESSAGE Operation details !SUBENTRY 1 org.eclipse.equinox.p2.director 4 1 2011-07-27 00:15:28.049 !MESSAGE Cannot complete the install because some dependencies are not satisfiable !SUBENTRY 2 org.eclipse.equinox.p2.director 4 0 2011-07-27 00:15:28.049 !MESSAGE org.eclipse.linuxtools.callgraph.feature.group [0.0.2.201106060936] cannot be installed in this environment because its filter is not applicable. !ENTRY org.eclipse.equinox.p2.operations 4 0 2011-07-27 00:15:28.644 !MESSAGE Operation details !SUBENTRY 1 org.eclipse.equinox.p2.director 4 1 2011-07-27 00:15:28.644 !MESSAGE Cannot complete the install because some dependencies are not satisfiable !SUBENTRY 2 org.eclipse.equinox.p2.director 4 0 2011-07-27 00:15:28.644 !MESSAGE org.eclipse.linuxtools.callgraph.feature.group [0.0.2.201106060936] cannot be installed in this environment because its filter is not applicable. !ENTRY org.eclipse.equinox.p2.operations 4 0 2011-07-27 00:27:35.152 !MESSAGE Operation details !SUBENTRY 1 org.eclipse.equinox.p2.director 4 1 2011-07-27 00:27:35.158 !MESSAGE Cannot complete the install because some dependencies are not satisfiable !SUBENTRY 2 org.eclipse.equinox.p2.director 4 0 2011-07-27 00:27:35.159 !MESSAGE org.eclipse.linuxtools.callgraph.feature.group [0.0.2.201106060936] cannot be installed in this environment because its filter is not applicable. !ENTRY org.eclipse.equinox.p2.operations 4 0 2011-07-27 00:27:35.215 !MESSAGE Operation details !SUBENTRY 1 org.eclipse.equinox.p2.director 4 1 2011-07-27 00:27:35.216 !MESSAGE Cannot complete the install because some dependencies are not satisfiable !SUBENTRY 2 org.eclipse.equinox.p2.director 4 0 2011-07-27 00:27:35.216 !MESSAGE org.eclipse.linuxtools.callgraph.feature.group [0.0.2.201106060936] cannot be installed in this environment because its filter is not applicable. !ENTRY org.eclipse.equinox.p2.operations 4 0 2011-07-27 01:07:17.988 !MESSAGE Operation details !SUBENTRY 1 org.eclipse.equinox.p2.director 4 1 2011-07-27 01:07:18.006 !MESSAGE Cannot complete the install because some dependencies are not satisfiable !SUBENTRY 2 org.eclipse.equinox.p2.director 4 0 2011-07-27 01:07:18.006 !MESSAGE org.eclipse.linuxtools.callgraph.feature.group [0.0.2.201106060936] cannot be installed in this environment because its filter is not applicable. !ENTRY org.eclipse.equinox.p2.operations 4 0 2011-07-27 01:07:19.847 !MESSAGE Operation details !SUBENTRY 1 org.eclipse.equinox.p2.director 4 1 2011-07-27 01:07:19.848 !MESSAGE Cannot complete the install because some dependencies are not satisfiable !SUBENTRY 2 org.eclipse.equinox.p2.director 4 0 2011-07-27 01:07:19.848 !MESSAGE org.eclipse.linuxtools.callgraph.feature.group [0.0.2.201106060936] cannot be installed in this environment because its filter is not applicable. I don't understand how the path windows like has appeared... if anyone knows how to solve this, I'll appreciate! Thank you for all your answers! Best regards, Alexandre Ferreira.

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• SQL SERVER – How to Recover SQL Database Data Deleted by Accident

  - by Pinal Dave

  In Repair a SQL Server database using a transaction log explorer, I showed how to use ApexSQL Log, a SQL Server transaction log viewer, to recover a SQL Server database after a disaster. In this blog, I’ll show you how to use another SQL Server disaster recovery tool from ApexSQL in a situation when data is accidentally deleted. You can download ApexSQL Recover here, install, and play along. With a good SQL Server disaster recovery strategy, data recovery is not a problem. You have a reliable full database backup with valid data, a full database backup and subsequent differential database backups, or a full database backup and a chain of transaction log backups. But not all situations are ideal. Here we’ll address some sub-optimal scenarios, where you can still successfully recover data. If you have only a full database backup This is the least optimal SQL Server disaster recovery strategy, as it doesn’t ensure minimal data loss. For example, data was deleted on Wednesday. Your last full database backup was created on Sunday, three days before the records were deleted. By using the full database backup created on Sunday, you will be able to recover SQL database records that existed in the table on Sunday. If there were any records inserted into the table on Monday or Tuesday, they will be lost forever. The same goes for records modified in this period. This method will not bring back modified records, only the old records that existed on Sunday. If you restore this full database backup, all your changes (intentional and accidental) will be lost and the database will be reverted to the state it had on Sunday. What you have to do is compare the records that were in the table on Sunday to the records on Wednesday, create a synchronization script, and execute it against the Wednesday database. If you have a full database backup followed by differential database backups Let’s say the situation is the same as in the example above, only you create a differential database backup every night. Use the full database backup created on Sunday, and the last differential database backup (created on Tuesday). In this scenario, you will lose only the data inserted and updated after the differential backup created on Tuesday. If you have a full database backup and a chain of transaction log backups This is the SQL Server disaster recovery strategy that provides minimal data loss. With a full chain of transaction logs, you can recover the SQL database to an exact point in time. To provide optimal results, you have to know exactly when the records were deleted, because restoring to a later point will not bring back the records. This method requires restoring the full database backup first. If you have any differential log backup created after the last full database backup, restore the most recent one. Then, restore transaction log backups, one by one, it the order they were created starting with the first created after the restored differential database backup. Now, the table will be in the state before the records were deleted. You have to identify the deleted records, script them and run the script against the original database. Although this method is reliable, it is time-consuming and requires a lot of space on disk. How to easily recover deleted records? The following solution enables you to recover SQL database records even if you have no full or differential database backups and no transaction log backups. To understand how ApexSQL Recover works, I’ll explain what happens when table data is deleted. Table data is stored in data pages. When you delete table records, they are not immediately deleted from the data pages, but marked to be overwritten by new records. Such records are not shown as existing anymore, but ApexSQL Recover can read them and create undo script for them. How long will deleted records stay in the MDF file? It depends on many factors, as time passes it’s less likely that the records will not be overwritten. The more transactions occur after the deletion, the more chances the records will be overwritten and permanently lost. Therefore, it’s recommended to create a copy of the database MDF and LDF files immediately (if you cannot take your database offline until the issue is solved) and run ApexSQL Recover on them. Note that a full database backup will not help here, as the records marked for overwriting are not included in the backup. First, I’ll delete some records from the Person.EmailAddress table in the AdventureWorks database.   I can delete these records in SQL Server Management Studio, or execute a script such as DELETE FROM Person.EmailAddress WHERE BusinessEntityID BETWEEN 70 AND 80 Then, I’ll start ApexSQL Recover and select From DELETE operation in the Recovery tab.   In the Select the database to recover step, first select the SQL Server instance. If it’s not shown in the drop-down list, click the Server icon right to the Server drop-down list and browse for the SQL Server instance, or type the instance name manually. Specify the authentication type and select the database in the Database drop-down list.   In the next step, you’re prompted to add additional data sources. As this can be a tricky step, especially for new users, ApexSQL Recover offers help via the Help me decide option.   The Help me decide option guides you through a series of questions about the database transaction log and advises what files to add. If you know that you have no transaction log backups or detached transaction logs, or the online transaction log file has been truncated after the data was deleted, select No additional transaction logs are available. If you know that you have transaction log backups that contain the delete transactions you want to recover, click Add transaction logs. The online transaction log is listed and selected automatically.   Click Add if to add transaction log backups. It would be best if you have a full transaction log chain, as explained above. The next step for this option is to specify the time range.   Selecting a small time range for the time of deletion will create the recovery script just for the accidentally deleted records. A wide time range might script the records deleted on purpose, and you don’t want that. If needed, you can check the script generated and manually remove such records. After that, for all data sources options, the next step is to select the tables. Be careful here, if you deleted some data from other tables on purpose, and don’t want to recover them, don’t select all tables, as ApexSQL Recover will create the INSERT script for them too.   The next step offers two options: to create a recovery script that will insert the deleted records back into the Person.EmailAddress table, or to create a new database, create the Person.EmailAddress table in it, and insert the deleted records. I’ll select the first one.   The recovery process is completed and 11 records are found and scripted, as expected.   To see the script, click View script. ApexSQL Recover has its own script editor, where you can review, modify, and execute the recovery script. The insert into statements look like: INSERT INTO Person.EmailAddress( BusinessEntityID, EmailAddressID, EmailAddress, rowguid, ModifiedDate) VALUES( 70, 70, N'[email protected]' COLLATE SQL_Latin1_General_CP1_CI_AS, 'd62c5b4e-c91f-403f-b630-7b7e0fda70ce', '20030109 00:00:00.000' ); To execute the script, click Execute in the menu.   If you want to check whether the records are really back, execute SELECT * FROM Person.EmailAddress WHERE BusinessEntityID BETWEEN 70 AND 80 As shown, ApexSQL Recover recovers SQL database data after accidental deletes even without the database backup that contains the deleted data and relevant transaction log backups. ApexSQL Recover reads the deleted data from the database data file, so this method can be used even for databases in the Simple recovery model. Besides recovering SQL database records from a DELETE statement, ApexSQL Recover can help when the records are lost due to a DROP TABLE, or TRUNCATE statement, as well as repair a corrupted MDF file that cannot be attached to as SQL Server instance. You can find more information about how to recover SQL database lost data and repair a SQL Server database on ApexSQL Solution center. There are solutions for various situations when data needs to be recovered. Reference: Pinal Dave (http://blog.sqlauthority.com)Filed under: PostADay, SQL, SQL Authority, SQL Backup and Restore, SQL Query, SQL Server, SQL Tips and Tricks, T SQL

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• Jetty 7 + MySQL Config [java.lang.ClassNotFoundException: org.mortbay.jetty.webapp.WebAppContext]

  - by Scott Chang

  I've been trying to get a c3p0 db connection pool configured for Jetty, but I keep getting a ClassNotFoundException: 2010-03-14 19:32:12.028:WARN::Failed startup of context WebAppContext@fccada@fccada/phpMyAdmin,file:/usr/local/jetty/webapps/phpMyAdmin/,file:/usr/local/jetty/webapps/phpMyAdmin/ java.lang.ClassNotFoundException: org.mortbay.jetty.webapp.WebAppContext at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:313) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:266) at org.eclipse.jetty.util.Loader.loadClass(Loader.java:90) at org.eclipse.jetty.xml.XmlConfiguration.nodeClass(XmlConfiguration.java:224) at org.eclipse.jetty.xml.XmlConfiguration.configure(XmlConfiguration.java:187) at org.eclipse.jetty.webapp.JettyWebXmlConfiguration.configure(JettyWebXmlConfiguration.java:77) at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:975) at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:586) at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:349) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55) at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:165) at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:162) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55) at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:165) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55) at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:92) at org.eclipse.jetty.server.Server.doStart(Server.java:228) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55) at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:990) at java.security.AccessController.doPrivileged(Native Method) at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:955) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.eclipse.jetty.start.Main.invokeMain(Main.java:394) at org.eclipse.jetty.start.Main.start(Main.java:546) at org.eclipse.jetty.start.Main.parseCommandLine(Main.java:208) at org.eclipse.jetty.start.Main.main(Main.java:75) I'm new to Jetty and I want to ultimately get phpMyAdmin and WordPress to run on it through Quercus and a JDBC connection. Here are my web.xml and jetty-web.xml files in my WEB-INF directory. jetty-web.xml: <?xml version="1.0"?> <!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting//DTD Configure//EN" "http://jetty.mortbay.org/configure.dtd"> <Configure class="org.mortbay.jetty.webapp.WebAppContext"> <New id="mysql" class="org.mortbay.jetty.plus.naming.Resource"> <Arg>jdbc/mysql</Arg> <Arg> <New class="com.mchange.v2.c3p0.ComboPooledDataSource"> <Set name="Url">jdbc:mysql://localhost:3306/mysql</Set> <Set name="User">user</Set> <Set name="Password">pw</Set> </New> </Arg> </New> </Configure> web.xml: <?xml version="1.0"?> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN" "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd"> <web-app> <description>Caucho Technology's PHP Implementation</description> <resource-ref> <description>My DataSource Reference</description> <res-ref-name>jdbc/mysql</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref> <servlet> <servlet-name>Quercus Servlet</servlet-name> <servlet-class>com.caucho.quercus.servlet.QuercusServlet</servlet-class> <!-- Specifies the encoding Quercus should use to read in PHP scripts. --> <init-param> <param-name>script-encoding</param-name> <param-value>UTF-8</param-value> </init-param> <!-- Tells Quercus to use the following JDBC database and to ignore the arguments of mysql_connect(). --> <init-param> <param-name>database</param-name> <param-value>jdbc/mysql</param-value> </init-param> <init-param> <param-name>ini-file</param-name> <param-value>WEB-INF/php.ini</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>Quercus Servlet</servlet-name> <url-pattern>*.php</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.php</welcome-file> </welcome-file-list> </web-app> I'm guessing that I'm missing a few jars or something. Currently I have placed the following jars in my WEB-INF/lib directory: c3p0-0.9.1.2.jar commons-dbcp-1.4.jar commons-pool-1.5.4.jar mysql-connector-java-5.1.12-bin.jar I have also tried to put these jars in JETTY-HOME/lib/ext, but to no avail... Someone please tell me what is wrong with my configuration. I'm sick of digging through Jetty's crappy documentation.

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• How can I get penetration depth from Minkowski Portal Refinement / Xenocollide?

  - by Raven Dreamer

  I recently got an implementation of Minkowski Portal Refinement (MPR) successfully detecting collision. Even better, my implementation returns a good estimate (local minimum) direction for the minimum penetration depth. So I took a stab at adjusting the algorithm to return the penetration depth in an arbitrary direction, and was modestly successful - my altered method works splendidly for face-edge collision resolution! What it doesn't currently do, is correctly provide the minimum penetration depth for edge-edge scenarios, such as the case on the right: What I perceive to be happening, is that my current method returns the minimum penetration depth to the nearest vertex - which works fine when the collision is actually occurring on the plane of that vertex, but not when the collision happens along an edge. Is there a way I can alter my method to return the penetration depth to the point of collision, rather than the nearest vertex? Here's the method that's supposed to return the minimum penetration distance along a specific direction: public static Vector3 CalcMinDistance(List<Vector3> shape1, List<Vector3> shape2, Vector3 dir) { //holding variables Vector3 n = Vector3.zero; Vector3 swap = Vector3.zero; // v0 = center of Minkowski sum v0 = Vector3.zero; // Avoid case where centers overlap -- any direction is fine in this case //if (v0 == Vector3.zero) return Vector3.zero; //always pass in a valid direction. // v1 = support in direction of origin n = -dir; //get the differnce of the minkowski sum Vector3 v11 = GetSupport(shape1, -n); Vector3 v12 = GetSupport(shape2, n); v1 = v12 - v11; //if the support point is not in the direction of the origin if (v1.Dot(n) <= 0) { //Debug.Log("Could find no points this direction"); return Vector3.zero; } // v2 - support perpendicular to v1,v0 n = v1.Cross(v0); if (n == Vector3.zero) { //v1 and v0 are parallel, which means //the direction leads directly to an endpoint n = v1 - v0; //shortest distance is just n //Debug.Log("2 point return"); return n; } //get the new support point Vector3 v21 = GetSupport(shape1, -n); Vector3 v22 = GetSupport(shape2, n); v2 = v22 - v21; if (v2.Dot(n) <= 0) { //can't reach the origin in this direction, ergo, no collision //Debug.Log("Could not reach edge?"); return Vector2.zero; } // Determine whether origin is on + or - side of plane (v1,v0,v2) //tests linesegments v0v1 and v0v2 n = (v1 - v0).Cross(v2 - v0); float dist = n.Dot(v0); // If the origin is on the - side of the plane, reverse the direction of the plane if (dist > 0) { //swap the winding order of v1 and v2 swap = v1; v1 = v2; v2 = swap; //swap the winding order of v11 and v12 swap = v12; v12 = v11; v11 = swap; //swap the winding order of v11 and v12 swap = v22; v22 = v21; v21 = swap; //and swap the plane normal n = -n; } /// // Phase One: Identify a portal while (true) { // Obtain the support point in a direction perpendicular to the existing plane // Note: This point is guaranteed to lie off the plane Vector3 v31 = GetSupport(shape1, -n); Vector3 v32 = GetSupport(shape2, n); v3 = v32 - v31; if (v3.Dot(n) <= 0) { //can't enclose the origin within our tetrahedron //Debug.Log("Could not reach edge after portal?"); return Vector3.zero; } // If origin is outside (v1,v0,v3), then eliminate v2 and loop if (v1.Cross(v3).Dot(v0) < 0) { //failed to enclose the origin, adjust points; v2 = v3; v21 = v31; v22 = v32; n = (v1 - v0).Cross(v3 - v0); continue; } // If origin is outside (v3,v0,v2), then eliminate v1 and loop if (v3.Cross(v2).Dot(v0) < 0) { //failed to enclose the origin, adjust points; v1 = v3; v11 = v31; v12 = v32; n = (v3 - v0).Cross(v2 - v0); continue; } bool hit = false; /// // Phase Two: Refine the portal int phase2 = 0; // We are now inside of a wedge... while (phase2 < 20) { phase2++; // Compute normal of the wedge face n = (v2 - v1).Cross(v3 - v1); n.Normalize(); // Compute distance from origin to wedge face float d = n.Dot(v1); // If the origin is inside the wedge, we have a hit if (d > 0 ) { //Debug.Log("Do plane test here"); float T = n.Dot(v2) / n.Dot(dir); Vector3 pointInPlane = (dir * T); return pointInPlane; } // Find the support point in the direction of the wedge face Vector3 v41 = GetSupport(shape1, -n); Vector3 v42 = GetSupport(shape2, n); v4 = v42 - v41; float delta = (v4 - v3).Dot(n); float separation = -(v4.Dot(n)); if (delta <= kCollideEpsilon || separation >= 0) { //Debug.Log("Non-convergance detected"); //Debug.Log("Do plane test here"); return Vector3.zero; } // Compute the tetrahedron dividing face (v4,v0,v1) float d1 = v4.Cross(v1).Dot(v0); // Compute the tetrahedron dividing face (v4,v0,v2) float d2 = v4.Cross(v2).Dot(v0); // Compute the tetrahedron dividing face (v4,v0,v3) float d3 = v4.Cross(v3).Dot(v0); if (d1 < 0) { if (d2 < 0) { // Inside d1 & inside d2 ==> eliminate v1 v1 = v4; v11 = v41; v12 = v42; } else { // Inside d1 & outside d2 ==> eliminate v3 v3 = v4; v31 = v41; v32 = v42; } } else { if (d3 < 0) { // Outside d1 & inside d3 ==> eliminate v2 v2 = v4; v21 = v41; v22 = v42; } else { // Outside d1 & outside d3 ==> eliminate v1 v1 = v4; v11 = v41; v12 = v42; } } } return Vector3.zero; } }

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• JSF Portlets in Liferay on JBoss

  - by JBirch

  I'm currently looking at working with and deploying JSF portlets into Liferay 6.0.5, sitting on JBoss 5.1.0. I ran into a lot of trouble trying to port some JSF-y/Seam-y/EJB-y stuff I had lying around, so I thought I'd start simple and work my way up. I could generate generic portlets using the NetBeans Maven archetype for Liferay portlets absolutely fine, but it's rather irrelevant because I wanted JSF portlets I took an example JSF portlet from http://www.liferay.com/downloads/liferay-portal/community-plugins/-/software_catalog/products/5546866 and attempted to deploy into a clean, vanilla installation of Liferay 6.0.5/JBoss 5.1.0 to no avail. The log messages are reproduced at the end of this. This particular example was actually tested for GlassFish and Tomcat, so it's not particularly helpful considering I'm deplying into JBoss. I tried ripping it apart and removing the jsf implementation contained within as there is a jsf implementation shipped with JBoss (Mojarra 1.2_12, in this case). 03:16:17,173 INFO [PortletAutoDeployListener] Copying portlets for /usr/local/[REDACTED]/liferay/liferay-portal-6.0.5/deploy/richfaces-sun-jsf1.2-facelets-portlet-1.2.war Expanding: /usr/local/[REDACTED]/liferay/liferay-portal-6.0.5/deploy/richfaces-sun-jsf1.2-facelets-portlet-1.2.war into /tmp/20110201031617188 Copying 1 file to /tmp/20110201031617188/WEB-INF Copying 1 file to /tmp/20110201031617188/WEB-INF/classes Copying 1 file to /tmp/20110201031617188/WEB-INF/classes Copying 47 files to /usr/local/[REDACTED]/liferay/liferay-portal-6.0.5/jboss-5.1.0/server/default/deploy/richfaces-sun-jsf1.2-facelets-portlet.war Copying 1 file to /usr/local/[REDACTED]/liferay/liferay-portal-6.0.5/jboss-5.1.0/server/default/deploy/richfaces-sun-jsf1.2-facelets-portlet.war Deleting directory /tmp/20110201031617188 03:16:20,075 INFO [PortletAutoDeployListener] Portlets for /usr/local/[REDACTED]/liferay/liferay-portal-6.0.5/deploy/richfaces-sun-jsf1.2-facelets-portlet-1.2.war copied successfully. Deployment will start in a few seconds. 03:16:23,632 INFO [TomcatDeployment] deploy, ctxPath=/richfaces-sun-jsf1.2-facelets-portlet 03:16:24,446 INFO [PortletHotDeployListener] Registering portlets for richfaces-sun-jsf1.2-facelets-portlet 03:16:24,492 INFO [faces] Init GenericFacesPortlet for portlet 1 03:16:24,495 INFO [faces] Bridge class name is org.jboss.portletbridge.AjaxPortletBridge 03:16:24,509 INFO [faces] The bridge does not support doHeaders method 03:16:24,510 INFO [faces] GenericFacesPortlet for portlet 1 initialized 03:16:24,555 INFO [PortletHotDeployListener] 1 portlet for richfaces-sun-jsf1.2-facelets-portlet is available for use 03:16:24,627 SEVERE [webapp] Initialization of the JSF runtime either failed or did not occurr. Review the server''s log for details. java.lang.InstantiationException: org.jboss.portletbridge.context.FacesContextFactoryImpl at java.lang.Class.newInstance0(Class.java:340) at java.lang.Class.newInstance(Class.java:308) at javax.faces.FactoryFinder.getImplGivenPreviousImpl(FactoryFinder.java:537) at javax.faces.FactoryFinder.getImplementationInstance(FactoryFinder.java:394) at javax.faces.FactoryFinder.access$400(FactoryFinder.java:135) at javax.faces.FactoryFinder$FactoryManager.getFactory(FactoryFinder.java:717) at javax.faces.FactoryFinder.getFactory(FactoryFinder.java:239) at javax.faces.webapp.FacesServlet.init(FacesServlet.java:164) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1048) at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:950) at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4122) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4421) at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeployInternal(TomcatDeployment.java:310) at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeploy(TomcatDeployment.java:142) at org.jboss.web.deployers.AbstractWarDeployment.start(AbstractWarDeployment.java:461) at org.jboss.web.deployers.WebModule.startModule(WebModule.java:118) at org.jboss.web.deployers.WebModule.start(WebModule.java:97) at sun.reflect.GeneratedMethodAccessor286.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:157) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96) at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:668) at org.jboss.system.microcontainer.ServiceProxy.invoke(ServiceProxy.java:206) at $Proxy38.start(Unknown Source) at org.jboss.system.microcontainer.StartStopLifecycleAction.installAction(StartStopLifecycleAction.java:42) at org.jboss.system.microcontainer.StartStopLifecycleAction.installAction(StartStopLifecycleAction.java:37) at org.jboss.dependency.plugins.action.SimpleControllerContextAction.simpleInstallAction(SimpleControllerContextAction.java:62) at org.jboss.dependency.plugins.action.AccessControllerContextAction.install(AccessControllerContextAction.java:71) at org.jboss.dependency.plugins.AbstractControllerContextActions.install(AbstractControllerContextActions.java:51) at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:348) at org.jboss.system.microcontainer.ServiceControllerContext.install(ServiceControllerContext.java:286) at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1631) at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:934) at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1082) at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:984) at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:822) at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:553) at org.jboss.system.ServiceController.doChange(ServiceController.java:688) at org.jboss.system.ServiceController.start(ServiceController.java:460) at org.jboss.system.deployers.ServiceDeployer.start(ServiceDeployer.java:163) at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:99) at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:46) at org.jboss.deployers.spi.deployer.helpers.AbstractSimpleRealDeployer.internalDeploy(AbstractSimpleRealDeployer.java:62) at org.jboss.deployers.spi.deployer.helpers.AbstractRealDeployer.deploy(AbstractRealDeployer.java:50) at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(DeployerWrapper.java:171) at org.jboss.deployers.plugins.deployers.DeployersImpl.doDeploy(DeployersImpl.java:1439) at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1157) at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1178) at org.jboss.deployers.plugins.deployers.DeployersImpl.install(DeployersImpl.java:1098) at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:348) at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1631) at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:934) at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1082) at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:984) at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:822) at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:553) at org.jboss.deployers.plugins.deployers.DeployersImpl.process(DeployersImpl.java:781) at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeployerImpl.java:702) at org.jboss.system.server.profileservice.repository.MainDeployerAdapter.process(MainDeployerAdapter.java:117) at org.jboss.system.server.profileservice.hotdeploy.HDScanner.scan(HDScanner.java:362) at org.jboss.system.server.profileservice.hotdeploy.HDScanner.run(HDScanner.java:255) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:181) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:205) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) at java.lang.Thread.run(Thread.java:619) 03:16:24,629 INFO [2-facelets-portlet]] Marking servlet FacesServlet as unavailable 03:16:24,630 ERROR [2-facelets-portlet]] Servlet /richfaces-sun-jsf1.2-facelets-portlet threw load() exception javax.servlet.UnavailableException: Initialization of the JSF runtime either failed or did not occurr. Review the server''s log for details. at javax.faces.webapp.FacesServlet.init(FacesServlet.java:172) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1048) at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:950) at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4122) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4421) at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeployInternal(TomcatDeployment.java:310) at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeploy(TomcatDeployment.java:142) at org.jboss.web.deployers.AbstractWarDeployment.start(AbstractWarDeployment.java:461) at org.jboss.web.deployers.WebModule.startModule(WebModule.java:118) at org.jboss.web.deployers.WebModule.start(WebModule.java:97) at sun.reflect.GeneratedMethodAccessor286.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:157) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96) at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:668) at org.jboss.system.microcontainer.ServiceProxy.invoke(ServiceProxy.java:206) at $Proxy38.start(Unknown Source) at org.jboss.system.microcontainer.StartStopLifecycleAction.installAction(StartStopLifecycleAction.java:42) at org.jboss.system.microcontainer.StartStopLifecycleAction.installAction(StartStopLifecycleAction.java:37) at org.jboss.dependency.plugins.action.SimpleControllerContextAction.simpleInstallAction(SimpleControllerContextAction.java:62) at org.jboss.dependency.plugins.action.AccessControllerContextAction.install(AccessControllerContextAction.java:71) at org.jboss.dependency.plugins.AbstractControllerContextActions.install(AbstractControllerContextActions.java:51) at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:348) at org.jboss.system.microcontainer.ServiceControllerContext.install(ServiceControllerContext.java:286) at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1631) at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:934) at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1082) at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:984) at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:822) at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:553) at org.jboss.system.ServiceController.doChange(ServiceController.java:688) at org.jboss.system.ServiceController.start(ServiceController.java:460) at org.jboss.system.deployers.ServiceDeployer.start(ServiceDeployer.java:163) at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:99) at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:46) at org.jboss.deployers.spi.deployer.helpers.AbstractSimpleRealDeployer.internalDeploy(AbstractSimpleRealDeployer.java:62) at org.jboss.deployers.spi.deployer.helpers.AbstractRealDeployer.deploy(AbstractRealDeployer.java:50) at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(DeployerWrapper.java:171) at org.jboss.deployers.plugins.deployers.DeployersImpl.doDeploy(DeployersImpl.java:1439) at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1157) at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1178) at org.jboss.deployers.plugins.deployers.DeployersImpl.install(DeployersImpl.java:1098) at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:348) at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1631) at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:934) at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1082) at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:984) at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:822) at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:553) at org.jboss.deployers.plugins.deployers.DeployersImpl.process(DeployersImpl.java:781) at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeployerImpl.java:702) at org.jboss.system.server.profileservice.repository.MainDeployerAdapter.process(MainDeployerAdapter.java:117) at org.jboss.system.server.profileservice.hotdeploy.HDScanner.scan(HDScanner.java:362) at org.jboss.system.server.profileservice.hotdeploy.HDScanner.run(HDScanner.java:255) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:181) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:205) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) at java.lang.Thread.run(Thread.java:619)

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• trying to override getView in a SimpleCursorAdapter gives NullPointerException

  - by Dimitry Hristov

  Would very much appreciate any help or hint on were to go next. I'm trying to change the content of a row in ListView programmatically. In one row there are 3 TextView and a ProgressBar. I want to animate the ProgressBar if the 'result' column of the current row is zero. After reading some tutorials and docs, I came to the conclusion that LayoutInflater has to be used and getView() - overriden. Maybe I am wrong on this. If I return row = inflater.inflate(R.layout.row, null); from the function, it gives NullPointerException. Here is the code: private final class mySimpleCursorAdapter extends SimpleCursorAdapter { private Cursor localCursor; private Context localContext; public mySimpleCursorAdapter(Context context, int layout, Cursor c, String[] from, int[] to) { super(context, layout, c, from, to); this.localCursor = c; this.localContext = context; } /** * 1. ListView asks adapter "give me a view" (getView) for each item of the list * 2. A new View is returned and displayed */ public View getView(int position, View convertView, ViewGroup parent) { View row = super.getView(position, convertView, parent); LayoutInflater inflater = (LayoutInflater)localContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); String result = localCursor.getString(2); int resInt = Integer.parseInt(result); Log.d(TAG, "row " + row); // if 'result' column form the TABLE is 0, do something useful: if(resInt == 0) { ProgressBar progress = (ProgressBar) row.findViewById(R.id.update_progress); progress.setIndeterminate(true); TextView edit1 = (TextView)row.findViewById(R.id.row_id); TextView edit2 = (TextView)row.findViewById(R.id.request); TextView edit3 = (TextView)row.findViewById(R.id.result); edit1.setText("1"); edit2.setText("2"); edit3.setText("3"); row = inflater.inflate(R.layout.row, null); } return row; } here is the Stack Trace: 03-08 03:15:29.639: ERROR/AndroidRuntime(619): java.lang.NullPointerException 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.SimpleCursorAdapter.bindView(SimpleCursorAdapter.java:149) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.CursorAdapter.getView(CursorAdapter.java:186) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at com.dhristov.test1.test1$mySimpleCursorAdapter.getView(test1.java:105) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.AbsListView.obtainView(AbsListView.java:1256) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.ListView.makeAndAddView(ListView.java:1668) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.ListView.fillDown(ListView.java:637) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.ListView.fillSpecific(ListView.java:1224) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.ListView.layoutChildren(ListView.java:1499) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.AbsListView.onLayout(AbsListView.java:1113) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.View.layout(View.java:6830) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:998) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.onLayout(LinearLayout.java:918) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.View.layout(View.java:6830) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:998) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.onLayout(LinearLayout.java:918) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.View.layout(View.java:6830) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.FrameLayout.onLayout(FrameLayout.java:333) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.View.layout(View.java:6830) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:998) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.LinearLayout.onLayout(LinearLayout.java:918) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.View.layout(View.java:6830) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.widget.FrameLayout.onLayout(FrameLayout.java:333) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.View.layout(View.java:6830) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.ViewRoot.performTraversals(ViewRoot.java:996) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.view.ViewRoot.handleMessage(ViewRoot.java:1633) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.os.Handler.dispatchMessage(Handler.java:99) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.os.Looper.loop(Looper.java:123) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at android.app.ActivityThread.main(ActivityThread.java:4363) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at java.lang.reflect.Method.invokeNative(Native Method) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at java.lang.reflect.Method.invoke(Method.java:521) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 03-08 03:15:29.639: ERROR/AndroidRuntime(619): at dalvik.system.NativeStart.main(Native Method)

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• Android: how to hide and then show View with animation effect?

  - by tomash

  I have similar question like this one: http://stackoverflow.com/questions/2079074/update-layout-with-the-animation Basically: I have one vertical LinearLayout View with edittext, button and then list. I'd like to hide exittext after pressing button to make more space for list (button will go up). On second press edittext should be visible again. Edittext and button have "wrap_content" height. I'd like to hide and show edittext with animation. I succeeded to animate hiding by overloading Animation's applyTransformation: final float edittextheight= edittext.getHeight(); [....] @Override protected void applyTransformation(float interpolatedTime, Transformation t) { super.applyTransformation(interpolatedTime, t); android.view.ViewGroup.LayoutParams lp = edittext.getLayoutParams(); lp.height = (int)(edittextheight*(1.0-interpolatedTime)); edittext.setLayoutParams(lp); } Problem: I don't know how to calculate height to animate showing - edittext.getHeight(); returns 0 when widget is hidden and in layout definition I'm using "wrap_content". Help?

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• IE dropdown z-index bug

  - by Justine

  I'm having a problem with a dropdown menu under IE (6 and 7). http://www.amaconsulting.pl/promocje.html As you can see, the dropdown hides behind the main content area in IE. It's a known bug and general advice is to set a z-index for header and content areas, so IE knows their "place", explained in the article here: http://bit.ly/coSPcI I've set the z-index of .header div to 20 and .featured, .content, .primary, .main to 1, trying to find the right div to fix the problem. While the dropdown stopped hiding behind the .featured div, it still hides behind the main content divs (either .primary or .main, .secondary is fine). The z-indexes for these divs are set in a separate stylesheet, ie.css, in case someone'll be looking for them. If someone could provide some advice, I'd be very grateful.

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• Launch market place with id of an application that doesn't exist in the android market place

  - by Gaurav

  Hi, I am creating an application that checks the installation of a package and then launches the market-place with its id. When I try to launch market place with id of an application say com.mybrowser.android by throwing an intent android.intent.action.VIEW with url: market://details?id=com.mybrowser.android, the market place application does launches but crashes after launch. Note: the application com.mybrowser.android doesn't exists in the market-place. MyApplication is my application. $ adb logcat I/ActivityManager( 1030): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=myapp.testapp/.MyApplication } I/ActivityManager( 1030): Start proc myapp.testapp for activity myapp.testapp/.MyApplication: pid=3858 uid=10047 gids={1015, 3003} I/MyApplication( 3858): [ Activity CREATED ] I/MyApplication( 3858): [ Activity STARTED ] I/MyApplication( 3858): onResume D/dalvikvm( 1109): GC freed 6571 objects / 423480 bytes in 73ms I/MyApplication( 3858): Pressed OK button I/MyApplication( 3858): Broadcasting Intent: android.intent.action.VIEW, data: market://details?id=com.mybrowser.android I/ActivityManager( 1030): Starting activity: Intent { act=android.intent.action.VIEW dat=market://details?id=com.mybrowser.android flg=0x10000000 cmp=com.android.ven ding/.AssetInfoActivity } I/MyApplication( 3858): onPause I/ActivityManager( 1030): Start proc com.android.vending for activity com.android.vending/.AssetInfoActivity: pid=3865 uid=10023 gids={3003} I/ActivityThread( 3865): Publishing provider com.android.vending.SuggestionsProvider: com.android.vending.SuggestionsProvider D/dalvikvm( 1030): GREF has increased to 701 I/vending ( 3865): com.android.vending.api.RadioHttpClient$1.handleMessage(): Handle DATA_STATE_CHANGED event: NetworkInfo: type: WIFI[], state: CONNECTED/CO NNECTED, reason: (unspecified), extra: (none), roaming: false, failover: false, isAvailable: true I/ActivityManager( 1030): Displayed activity com.android.vending/.AssetInfoActivity: 609 ms (total 7678 ms) D/dalvikvm( 1030): GC freed 10458 objects / 676440 bytes in 128ms I/MyApplication( 3858): [ Activity STOPPED ] D/dalvikvm( 3865): GC freed 3538 objects / 254008 bytes in 84ms W/dalvikvm( 3865): threadid=19: thread exiting with uncaught exception (group=0x4001b180) E/AndroidRuntime( 3865): Uncaught handler: thread AsyncTask #1 exiting due to uncaught exception E/AndroidRuntime( 3865): java.lang.RuntimeException: An error occured while executing doInBackground() E/AndroidRuntime( 3865): at android.os.AsyncTask$3.done(AsyncTask.java:200) E/AndroidRuntime( 3865): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) E/AndroidRuntime( 3865): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) E/AndroidRuntime( 3865): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) E/AndroidRuntime( 3865): at java.util.concurrent.FutureTask.run(FutureTask.java:137) E/AndroidRuntime( 3865): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068) E/AndroidRuntime( 3865): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561) E/AndroidRuntime( 3865): at java.lang.Thread.run(Thread.java:1096) E/AndroidRuntime( 3865): Caused by: java.lang.NullPointerException E/AndroidRuntime( 3865): at com.android.vending.AssetItemAdapter$ReloadLocalAssetInformationTask.doInBackground(AssetItemAdapter.java:845) E/AndroidRuntime( 3865): at com.android.vending.AssetItemAdapter$ReloadLocalAssetInformationTask.doInBackground(AssetItemAdapter.java:831) E/AndroidRuntime( 3865): at android.os.AsyncTask$2.call(AsyncTask.java:185) E/AndroidRuntime( 3865): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) E/AndroidRuntime( 3865): ... 4 more I/Process ( 1030): Sending signal. PID: 3865 SIG: 3 I/dalvikvm( 3865): threadid=7: reacting to signal 3 I/dalvikvm( 3865): Wrote stack trace to '/data/anr/traces.txt' I/DumpStateReceiver( 1030): Added state dump to 1 crashes D/AndroidRuntime( 3865): Shutting down VM W/dalvikvm( 3865): threadid=3: thread exiting with uncaught exception (group=0x4001b180) E/AndroidRuntime( 3865): Uncaught handler: thread main exiting due to uncaught exception E/AndroidRuntime( 3865): java.lang.NullPointerException E/AndroidRuntime( 3865): at com.android.vending.controller.AssetInfoActivityController.getIdDeferToLocal(AssetInfoActivityController.java:637) E/AndroidRuntime( 3865): at com.android.vending.AssetInfoActivity.displayAssetInfo(AssetInfoActivity.java:556) E/AndroidRuntime( 3865): at com.android.vending.AssetInfoActivity.access$800(AssetInfoActivity.java:74) E/AndroidRuntime( 3865): at com.android.vending.AssetInfoActivity$LoadAssetInfoAction$1.run(AssetInfoActivity.java:917) E/AndroidRuntime( 3865): at android.os.Handler.handleCallback(Handler.java:587) E/AndroidRuntime( 3865): at android.os.Handler.dispatchMessage(Handler.java:92) E/AndroidRuntime( 3865): at android.os.Looper.loop(Looper.java:123) E/AndroidRuntime( 3865): at android.app.ActivityThread.main(ActivityThread.java:4363) E/AndroidRuntime( 3865): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime( 3865): at java.lang.reflect.Method.invoke(Method.java:521) E/AndroidRuntime( 3865): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) E/AndroidRuntime( 3865): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) E/AndroidRuntime( 3865): at dalvik.system.NativeStart.main(Native Method) I/Process ( 1030): Sending signal. PID: 3865 SIG: 3 W/ActivityManager( 1030): Process com.android.vending has crashed too many times: killing! D/ActivityManager( 1030): Force finishing activity com.android.vending/.AssetInfoActivity I/dalvikvm( 3865): threadid=7: reacting to signal 3 D/ActivityManager( 1030): Force removing process ProcessRecord{44e48548 3865:com.android.vending/10023} (com.android.vending/10023) However, when I try to launch the market place for a package that exists in the market place say com.opera.mini.android, everything works. Log for this case: D/dalvikvm( 966): GC freed 2781 objects / 195056 bytes in 99ms I/MyApplication( 1165): Pressed OK button I/MyApplication( 1165): Broadcasting Intent: android.intent.action.VIEW, data: market://details?id=com.opera.mini.android I/ActivityManager( 78): Starting activity: Intent { act=android.intent.action.VIEW dat=market://details?id=com.opera.mini.android flg=0x10000000 cmp=com.android.vending/.AssetInfoActivity } I/AndroidRuntime( 1165): AndroidRuntime onExit calling exit(0) I/WindowManager( 78): WIN DEATH: Window{44c72308 myapp.testapp/myapp.testapp.MyApplication paused=true} I/ActivityManager( 78): Process myapp.testapp (pid 1165) has died. I/WindowManager( 78): WIN DEATH: Window{44c72958 myapp.testapp/myapp.testapp.MyApplication paused=false} D/dalvikvm( 78): GC freed 31778 objects / 1796368 bytes in 142ms I/ActivityManager( 78): Displayed activity com.android.vending/.AssetInfoActivity: 214 ms (total 22866 ms) W/KeyCharacterMap( 978): No keyboard for id 65540 W/KeyCharacterMap( 978): Using default keymap: /system/usr/keychars/qwerty.kcm.bin V/RenderScript_jni( 966): surfaceCreated V/RenderScript_jni( 966): surfaceChanged V/RenderScript( 966): setSurface 480 762 0x573430 D/ViewFlipper( 966): updateRunning() mVisible=true, mStarted=true, mUserPresent=true, mRunning=true D/dalvikvm( 978): GC freed 10065 objects / 624440 bytes in 95ms Any ideas? Thanks in advance!

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• How to programmatically disable onClick handler on Android AppWidget Button

  - by Gaks

  I have a Button on appwidget, that I need to 'enable'/'disable' programmatically from a Service. First idea was to call setBoolean(R.id.buttonid, "setClickable", false) to disable it, but apparently you can't call setClickable remotely. Another idea was was remove the text label from it with rv.setTextViewText(R.id.buttonid, "") and then remove the click handler by rv.setOnClickPendingIntent(R.id.buttonid, null). Unfortunately passing null to it causes NullPointerException in in android.app.ActivityThread.handleServiceArgs Is there some other way to programmatically disable/enable appwidget Button? I could just call rv.setViewVisibility(R.id.buttonid, View.GONE) to hide the button completely instead of disabling it. This would however completely break whole widget layout and I would like to avoid it. The solution I'm using now is hiding the button with setViewVisibility and showing other blank button instead to the keep appwidget layout as it was before.

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• How can I make www.mywebapp.com/bin return a 404 in ASP.NET MVC?

  - by Freewalker

  I'm using ASP.NET MVC to develop a web application, deploying to IIS 7. I've hidden my Files and Views directories with web.config files in those directories (they just return a normal 404). However, I haven't been able to get the web.config method to work in hiding my bin directory. When I access www.mywebapp.com/bin, I instead get a too-revealing page with this message: HTTP Error 404.8 - Not Found The request filtering module is configured to deny a path in the URL that contains a hiddenSegment section. The page reveals part of my directory structure. I just want it to return my 404 page like the Files and Views directories do. How can I get this behavior?

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• setup L2TP on Ubuntu 10.10

  - by luca

  I'm following this guide to setup a VPS on my Ubuntu VPS: http://riobard.com/blog/2010-04-30-l2tp-over-ipsec-ubuntu/ My config files are setup as in that guide, openswan version is 2.6.26 I think.. It doesn't work, I can show you my auth.log (on the VPS): Feb 18 06:11:07 maverick pluto[6909]: packet from 93.36.127.12:500: received Vendor ID payload [RFC 3947] method set to=109 Feb 18 06:11:07 maverick pluto[6909]: packet from 93.36.127.12:500: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike] method set to=110 Feb 18 06:11:07 maverick pluto[6909]: packet from 93.36.127.12:500: ignoring unknown Vendor ID payload [8f8d83826d246b6fc7a8a6a428c11de8] Feb 18 06:11:07 maverick pluto[6909]: packet from 93.36.127.12:500: ignoring unknown Vendor ID payload [439b59f8ba676c4c7737ae22eab8f582] Feb 18 06:11:07 maverick pluto[6909]: packet from 93.36.127.12:500: ignoring unknown Vendor ID payload [4d1e0e136deafa34c4f3ea9f02ec7285] Feb 18 06:11:07 maverick pluto[6909]: packet from 93.36.127.12:500: ignoring unknown Vendor ID payload [80d0bb3def54565ee84645d4c85ce3ee] Feb 18 06:11:07 maverick pluto[6909]: packet from 93.36.127.12:500: ignoring unknown Vendor ID payload [9909b64eed937c6573de52ace952fa6b] Feb 18 06:11:07 maverick pluto[6909]: packet from 93.36.127.12:500: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-03] meth=108, but already using method 110 Feb 18 06:11:07 maverick pluto[6909]: packet from 93.36.127.12:500: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-02] meth=107, but already using method 110 Feb 18 06:11:07 maverick pluto[6909]: packet from 93.36.127.12:500: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-02_n] meth=106, but already using method 110 Feb 18 06:11:07 maverick pluto[6909]: packet from 93.36.127.12:500: received Vendor ID payload [Dead Peer Detection] Feb 18 06:11:07 maverick pluto[6909]: "L2TP-PSK-NAT"[7] 93.36.127.12 #7: responding to Main Mode from unknown peer 93.36.127.12 Feb 18 06:11:07 maverick pluto[6909]: "L2TP-PSK-NAT"[7] 93.36.127.12 #7: transition from state STATE_MAIN_R0 to state STATE_MAIN_R1 Feb 18 06:11:07 maverick pluto[6909]: "L2TP-PSK-NAT"[7] 93.36.127.12 #7: STATE_MAIN_R1: sent MR1, expecting MI2 Feb 18 06:11:07 maverick pluto[6909]: "L2TP-PSK-NAT"[7] 93.36.127.12 #7: NAT-Traversal: Result using draft-ietf-ipsec-nat-t-ike (MacOS X): peer is NATed Feb 18 06:11:07 maverick pluto[6909]: "L2TP-PSK-NAT"[7] 93.36.127.12 #7: transition from state STATE_MAIN_R1 to state STATE_MAIN_R2 Feb 18 06:11:07 maverick pluto[6909]: "L2TP-PSK-NAT"[7] 93.36.127.12 #7: STATE_MAIN_R2: sent MR2, expecting MI3 Feb 18 06:11:07 maverick pluto[6909]: "L2TP-PSK-NAT"[7] 93.36.127.12 #7: Main mode peer ID is ID_IPV4_ADDR: '10.0.1.8' Feb 18 06:11:07 maverick pluto[6909]: "L2TP-PSK-NAT"[7] 93.36.127.12 #7: switched from "L2TP-PSK-NAT" to "L2TP-PSK-NAT" Feb 18 06:11:07 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #7: deleting connection "L2TP-PSK-NAT" instance with peer 93.36.127.12 {isakmp=#0/ipsec=#0} Feb 18 06:11:07 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #7: transition from state STATE_MAIN_R2 to state STATE_MAIN_R3 Feb 18 06:11:07 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #7: new NAT mapping for #7, was 93.36.127.12:500, now 93.36.127.12:36810 Feb 18 06:11:07 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #7: STATE_MAIN_R3: sent MR3, ISAKMP SA established {auth=OAKLEY_PRESHARED_KEY cipher=oakley_3des_cbc_192 prf=oakley_sha group=modp1024} Feb 18 06:11:07 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #7: ignoring informational payload, type IPSEC_INITIAL_CONTACT msgid=00000000 Feb 18 06:11:07 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #7: received and ignored informational message Feb 18 06:11:08 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #7: the peer proposed: 69.147.233.173/32:17/1701 -> 10.0.1.8/32:17/0 Feb 18 06:11:08 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #8: responding to Quick Mode proposal {msgid:183463cf} Feb 18 06:11:08 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #8: us: 69.147.233.173<69.147.233.173>[+S=C]:17/1701 Feb 18 06:11:08 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #8: them: 93.36.127.12[10.0.1.8,+S=C]:17/64111===10.0.1.8/32 Feb 18 06:11:08 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #8: transition from state STATE_QUICK_R0 to state STATE_QUICK_R1 Feb 18 06:11:08 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #8: STATE_QUICK_R1: sent QR1, inbound IPsec SA installed, expecting QI2 Feb 18 06:11:08 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #8: transition from state STATE_QUICK_R1 to state STATE_QUICK_R2 Feb 18 06:11:08 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #8: STATE_QUICK_R2: IPsec SA established transport mode {ESP=>0x0b1cf725 <0x0b719671 xfrm=AES_128-HMAC_SHA1 NATOA=none NATD=93.36.127.12:36810 DPD=none} Feb 18 06:11:28 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #7: received Delete SA(0x0b1cf725) payload: deleting IPSEC State #8 Feb 18 06:11:28 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #7: netlink recvfrom() of response to our XFRM_MSG_DELPOLICY message for policy eroute_connection delete was too long: 100 > 36 Feb 18 06:11:28 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #7: netlink recvfrom() of response to our XFRM_MSG_DELPOLICY message for policy [email protected] was too long: 168 > 36 Feb 18 06:11:28 maverick pluto[6909]: | raw_eroute result=0 Feb 18 06:11:28 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #7: received and ignored informational message Feb 18 06:11:28 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12 #7: received Delete SA payload: deleting ISAKMP State #7 Feb 18 06:11:28 maverick pluto[6909]: "L2TP-PSK-NAT"[8] 93.36.127.12: deleting connection "L2TP-PSK-NAT" instance with peer 93.36.127.12 {isakmp=#0/ipsec=#0} Feb 18 06:11:28 maverick pluto[6909]: packet from 93.36.127.12:36810: received and ignored informational message and my system log on OSX (from where I'm connecting): Feb 18 13:11:09 luca-ciorias-MacBook-Pro pppd[68656]: pppd 2.4.2 (Apple version 412.3) started by luca, uid 501 Feb 18 13:11:09 luca-ciorias-MacBook-Pro pppd[68656]: L2TP connecting to server '69.147.233.173' (69.147.233.173)... Feb 18 13:11:09 luca-ciorias-MacBook-Pro pppd[68656]: IPSec connection started Feb 18 13:11:09 luca-ciorias-MacBook-Pro racoon[68453]: Connecting. Feb 18 13:11:09 luca-ciorias-MacBook-Pro racoon[68453]: IKE Packet: transmit success. (Initiator, Main-Mode message 1). Feb 18 13:11:09 luca-ciorias-MacBook-Pro racoon[68453]: IKE Packet: receive success. (Initiator, Main-Mode message 2). Feb 18 13:11:09 luca-ciorias-MacBook-Pro racoon[68453]: IKE Packet: transmit success. (Initiator, Main-Mode message 3). Feb 18 13:11:09 luca-ciorias-MacBook-Pro racoon[68453]: IKE Packet: receive success. (Initiator, Main-Mode message 4). Feb 18 13:11:09 luca-ciorias-MacBook-Pro racoon[68453]: IKE Packet: transmit success. (Initiator, Main-Mode message 5). Feb 18 13:11:09 luca-ciorias-MacBook-Pro racoon[68453]: IKEv1 Phase1 AUTH: success. (Initiator, Main-Mode Message 6). Feb 18 13:11:09 luca-ciorias-MacBook-Pro racoon[68453]: IKE Packet: receive success. (Initiator, Main-Mode message 6). Feb 18 13:11:09 luca-ciorias-MacBook-Pro racoon[68453]: IKEv1 Phase1 Initiator: success. (Initiator, Main-Mode). Feb 18 13:11:09 luca-ciorias-MacBook-Pro racoon[68453]: IKE Packet: transmit success. (Information message). Feb 18 13:11:09 luca-ciorias-MacBook-Pro racoon[68453]: IKEv1 Information-Notice: transmit success. (ISAKMP-SA). Feb 18 13:11:10 luca-ciorias-MacBook-Pro racoon[68453]: IKE Packet: transmit success. (Initiator, Quick-Mode message 1). Feb 18 13:11:10 luca-ciorias-MacBook-Pro racoon[68453]: IKE Packet: receive success. (Initiator, Quick-Mode message 2). Feb 18 13:11:10 luca-ciorias-MacBook-Pro racoon[68453]: IKE Packet: transmit success. (Initiator, Quick-Mode message 3). Feb 18 13:11:10 luca-ciorias-MacBook-Pro racoon[68453]: IKEv1 Phase2 Initiator: success. (Initiator, Quick-Mode). Feb 18 13:11:10 luca-ciorias-MacBook-Pro racoon[68453]: Connected. Feb 18 13:11:10 luca-ciorias-MacBook-Pro pppd[68656]: IPSec connection established Feb 18 13:11:30 luca-ciorias-MacBook-Pro pppd[68656]: L2TP cannot connect to the server Feb 18 13:11:30 luca-ciorias-MacBook-Pro configd[20]: SCNCController: Disconnecting. (Connection tried to negotiate for, 22 seconds). Feb 18 13:11:30 luca-ciorias-MacBook-Pro racoon[68453]: IKE Packet: transmit success. (Information message). Feb 18 13:11:30 luca-ciorias-MacBook-Pro racoon[68453]: IKEv1 Information-Notice: transmit success. (Delete IPSEC-SA). Feb 18 13:11:30 luca-ciorias-MacBook-Pro racoon[68453]: IKE Packet: transmit success. (Information message). Feb 18 13:11:30 luca-ciorias-MacBook-Pro racoon[68453]: IKEv1 Information-Notice: transmit success. (Delete ISAKMP-SA). Feb 18 13:11:31 luca-ciorias-MacBook-Pro racoon[68453]: Disconnecting. (Connection was up for, 20.157953 seconds).

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• Highlight Row in GridView with Colored Columns

  - by Vincent Maverick Durano

  I wrote a blog post a while back before here that demonstrate how to highlight a GridView row on mouseover and as you can see its very easy to highlight rows in GridView. One of my colleague uses the same technique for implemeting gridview row highlighting but the problem is that if a Column has background color on it that cell will not be highlighted anymore. To make it more clear then let's build up a sample application. ASPX:   1: <asp:GridView runat="server" id="GridView1" onrowcreated="GridView1_RowCreated" 2: onrowdatabound="GridView1_RowDataBound"> 3: </asp:GridView>   CODE BEHIND:   1: private DataTable FillData() { 2:   3: DataTable dt = new DataTable(); 4: DataRow dr = null; 5:   6: //Create DataTable columns 7: dt.Columns.Add(new DataColumn("RowNumber", typeof(string))); 8: dt.Columns.Add(new DataColumn("Col1", typeof(string))); 9: dt.Columns.Add(new DataColumn("Col2", typeof(string))); 10: dt.Columns.Add(new DataColumn("Col3", typeof(string))); 11:   12: //Create Row for each columns 13: dr = dt.NewRow(); 14: dr["RowNumber"] = 1; 15: dr["Col1"] = "A"; 16: dr["Col2"] = "B"; 17: dr["Col3"] = "C"; 18: dt.Rows.Add(dr); 19:   20: dr = dt.NewRow(); 21: dr["RowNumber"] = 2; 22: dr["Col1"] = "AA"; 23: dr["Col2"] = "BB"; 24: dr["Col3"] = "CC"; 25: dt.Rows.Add(dr); 26:   27: dr = dt.NewRow(); 28: dr["RowNumber"] = 3; 29: dr["Col1"] = "A"; 30: dr["Col2"] = "B"; 31: dr["Col3"] = "CC"; 32: dt.Rows.Add(dr); 33:   34: dr = dt.NewRow(); 35: dr["RowNumber"] = 4; 36: dr["Col1"] = "A"; 37: dr["Col2"] = "B"; 38: dr["Col3"] = "CC"; 39: dt.Rows.Add(dr); 40:   41: dr = dt.NewRow(); 42: dr["RowNumber"] = 5; 43: dr["Col1"] = "A"; 44: dr["Col2"] = "B"; 45: dr["Col3"] = "CC"; 46: dt.Rows.Add(dr); 47:   48: return dt; 49: } 50:   51: protected void Page_Load(object sender, EventArgs e) { 52: if (!IsPostBack) { 53: GridView1.DataSource = FillData(); 54: GridView1.DataBind(); 55: } 56: }   As you can see there's nothing fancy in the code above. It just contain a method that fills a DataTable with a dummy data on it. Now here's the code for row highlighting:   1: protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e) { 2: //Set Background Color for Columns 1 and 3 3: e.Row.Cells[1].BackColor = System.Drawing.Color.Beige; 4: e.Row.Cells[3].BackColor = System.Drawing.Color.Red; 5:   6: //Attach onmouseover and onmouseout for row highlighting 7: e.Row.Attributes.Add("onmouseover", "this.style.backgroundColor='Blue'"); 8: e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=''"); 9: }   Running the code above will show something like this in the browser: On initial load: On mouseover of GridView row:   Noticed that Col1 and Col3 are not highlighted. Why? the reason is that Col1 and Col3 cells has background color set on it and we only highlight the rows (TR) and not the columns (TD) that's why on mouseover only the rows will be highlighted. To fix the issue we will create a javascript method that would remove the background color of the columns when highlighting a row and on mouseout set back the original color that is set on Col1 and Col3. Here are the codes below: JavaScript   1: <script type="text/javascript"> 2: function HighLightRow(rowIndex, colIndex,colIndex2, flag) { 3: var gv = document.getElementById("<%= GridView1.ClientID %>"); 4: var selRow = gv.rows[rowIndex]; 5: if (rowIndex > 0) { 6: if (flag == "sel") { 7: gv.rows[rowIndex].style.backgroundColor = 'Blue'; 8: gv.rows[rowIndex].style.color = "White"; 9: gv.rows[rowIndex].cells[colIndex].style.backgroundColor = ''; 10: gv.rows[rowIndex].cells[colIndex2].style.backgroundColor = ''; 11: } 12: else { 13: gv.rows[rowIndex].style.backgroundColor = ''; 14: gv.rows[rowIndex].style.color = "Black"; 15: gv.rows[rowIndex].cells[colIndex].style.backgroundColor = 'Beige'; 16: gv.rows[rowIndex].cells[colIndex2].style.backgroundColor = 'Red'; 17: } 18: } 19: } 20: </script>   The HighLightRow method is a javascript function that accepts four (4) parameters which are the rowIndex,colIndex,colIndex2 and the flag. The rowIndex is the current row index of the selected row in GridView. The colIndex is the index of Col1 and colIndex2 is the index of col3. We are passing these index because these columns has background color on it and we need to toggle its backgroundcolor when highlighting the row in GridView. Finally the flag is something that would determine if its selected or not. Now here's the code for calling the JavaScript function above.     1: protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e) { 2:   3: //Set Background Color for Columns 1 and 3 4: e.Row.Cells[1].BackColor = System.Drawing.Color.Beige; 5: e.Row.Cells[3].BackColor = System.Drawing.Color.Red; 6:   7: //Attach onmouseover and onmouseout for row highlighting 8: //and call the HighLightRow method with the required parameters 9: int index = e.Row.RowIndex + 1; 10: e.Row.Attributes.Add("onmouseover", "HighLightRow(" + index + "," + 1 + "," + 3 + ",'sel')"); 11: e.Row.Attributes.Add("onmouseout", "HighLightRow(" + index + "," + 1 + "," + 3 + ",'dsel')"); 12: 13: }   Running the code above will display something like this: On initial load:   On mouseover of GridView row:   That's it! I hope someone find this post useful!

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• Using Unity – Part 6

  - by nmarun

  This is the last of the ‘Unity’ series and I’ll be talking about generics here. If you’ve been following the previous articles, you must have noticed that I’m just adding more and more ‘Product’ classes to the project. I’ll change that trend in this blog where I’ll be adding an ICaller interface and a Caller class. 1: public interface ICaller<T> where T : IProduct 2: { 3: string CallMethod<T>(string typeName); 4: } 5:  6: public class Caller<T> : ICaller<T> where T:IProduct 7: { 8: public string CallMethod<T>(string typeName) 9: { 10: //... 11: } 12: } We’ll fill-in the implementation of the CallMethod in a few, but first, here’s what we’re going to do: create an instance of the Caller class pass it the IProduct as a generic parameter in the CallMethod method, we’ll use Unity to dynamically create an instance of IProduct implemented object I need to add the config information for ICaller and Caller types. 1: <typeAlias alias="ICaller`1" type="ProductModel.ICaller`1, ProductModel" /> 2: <typeAlias alias="Caller`1" type="ProductModel.Caller`1, ProductModel" /> The .NET Framework’s convention to express generic types is ICaller`1, where the digit following the "`" matches the number of types contained in the generic type. So a generic type that contains 4 types contained in the generic type would be declared as: 1: <typeAlias alias="Caller`4" type="ProductModel.Caller`4, ProductModel" /> On my .aspx page, I have the following UI design: 1: <asp:RadioButton ID="LegacyProduct" Text="Product" runat="server" GroupName="ProductWeb" 2: AutoPostBack="true" OnCheckedChanged="RadioButton_CheckedChanged" /> 3: <br /> 4: <asp:RadioButton ID="NewProduct" Text="Product 2" runat="server" GroupName="ProductWeb" 5: AutoPostBack="true" OnCheckedChanged="RadioButton_CheckedChanged" /> 6: <br /> 7: <asp:RadioButton ID="ComplexProduct" Text="Product 3" runat="server" GroupName="ProductWeb" 8: AutoPostBack="true" OnCheckedChanged="RadioButton_CheckedChanged" /> 9: <br /> 10: <asp:RadioButton ID="ArrayConstructor" Text="Product 4" runat="server" GroupName="ProductWeb" 11: AutoPostBack="true" OnCheckedChanged="RadioButton_CheckedChanged" /> Things to note here are that all these radio buttons belong to the same GroupName => only one of these four can be clicked. Next, all four controls postback to the same ‘OnCheckedChanged’ event and lastly the ID’s point to named types of IProduct (already added to the web.config file). 1: <type type="IProduct" mapTo="Product" name="LegacyProduct" /> 2:  3: <type type="IProduct" mapTo="Product2" name="NewProduct" /> 4:  5: <type type="IProduct" mapTo="Product3" name="ComplexProduct"> 6: ... 7: </type> 8:  9: <type type="IProduct" mapTo="Product4" name="ArrayConstructor"> 10: ... 11: </type> In my calling code, I see which radio button was clicked, pass that as an argument to the CallMethod method. 1: protected void RadioButton_CheckedChanged(object sender, EventArgs e) 2: { 3: string typeName = ((RadioButton)sender).ID; 4: ICaller<IProduct> caller = unityContainer.Resolve<ICaller<IProduct>>(); 5: productDetailsLabel.Text = caller.CallMethod<IProduct>(typeName); 6: } What’s basically happening here is that the ID of the control gets passed on to the typeName which will be one of “LegacyProduct”, “NewProduct”, “ComplexProduct” or “ArrayConstructor”. I then create an instance of an ICaller and pass the typeName to it. Now, we’ll fill in the blank for the CallMethod method (sorry for the naming guys). 1: public string CallMethod<T>(string typeName) 2: { 3: IUnityContainer unityContainer = HttpContext.Current.Application["UnityContainer"] as IUnityContainer; 4: T productInstance = unityContainer.Resolve<T>(typeName); 5: return ((IProduct)productInstance).WriteProductDetails(); 6: } This is where I’ll resolve the IProduct by passing the type name and calling the WriteProductDetails() method. With all things in place, when I run the application and choose different radio buttons, the output should look something like below:          Basically this is how generics come to play in Unity. Please see the code I’ve used for this here. This marks the end of the ‘Unity’ series. I’ll definitely post any updates that I find, but for now I don’t have anything planned.

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• IEnumerable.GetEnumerator() and IEnumerable<T>.GetEnumerator()

  - by Dylan Lin

  Hi, In the .net framework, there's a generic IEnumerable<T> interface which inherits from the not-generic IEnumerable, and they both have a GetEnumerator() method. The only differents between these two GetEnumerator() is the return type. Now I have a similar design, but when I compile the code, the compiler said: MyInterface<T>.GetItem()' hides inherited member 'MyInterface.GetItem()'. Use the new keyword if hiding was intended. The MyInterface<T>.GetItem() returns a concrete type T, while MyInterface.GetItem() returns type System.Object. So I think if the BCL team guys compile the .net framework, they will get the same warning. I think having compiler warnings is not good, what do you think? And how can I solve this problem? I mean I want to get the concrete type T when calling the MyInterface<T>.GetItem() not just a instance of type System.Object. Thanks in advance! :-)

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• Why do I get a null pointer exception from TabWidget?

  - by rushinge

  I'm writing an android program in which I have an activity that uses tabs. The Activity public class UnitActivity extends TabActivity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TabHost tabHost = getTabHost(); TabSpec spec; Resources res = getResources(); LayoutInflater.from(this).inflate(R.layout.unit_view, tabHost.getTabContentView(), true); spec = tabHost.newTabSpec("controls"); spec.setIndicator("Control", res.getDrawable(R.drawable.ic_tab_equalizer)); spec.setContent(R.id.txtview); tabHost.addTab(spec); } } The XML referenced by R.layout.unit_view <?xml version="1.0" encoding="utf-8"?> <TabHost xmlns:android="http://schemas.android.com/apk/res/android" android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent"> <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="5dp"> <TabWidget android:id="@android:id/tabs" android:layout_width="fill_parent" android:layout_height="wrap_content"/> <FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="5dp"> <TextView android:id="@+id/txtview" android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="bottom" android:text="nullpointer this!" /> </FrameLayout> </LinearLayout> </TabHost> As far as I can see I'm doing the same thing I see in the tabs1 api sample from the android sdk. I've tried "getLayoutInflator()" instead of "LayoutInflator.from(this)" with the same result. If I replace the LayoutInflater line with "setContentView(R.layout.unit_view)" my program doesn't crash with a null pointer exception but my content is completely blank and empty. I get the tab and that's it. I've checked to make sure R.layout.unit_view and tabHost are not null when it runs the LayoutInflater line and they seem to be fine. They're defenitely not null. I've also checked to make sure LayoutInflater.from(this) returns a valid layout inflater object and it does. The logcat indicating the error says E/AndroidRuntime( 541): java.lang.NullPointerException E/AndroidRuntime( 541): at android.widget.TabWidget.dispatchDraw(TabWidget.java:206) E/AndroidRuntime( 541): at android.view.ViewGroup.drawChild(ViewGroup.java:1529) E/AndroidRuntime( 541): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) E/AndroidRuntime( 541): at android.view.ViewGroup.drawChild(ViewGroup.java:1529) E/AndroidRuntime( 541): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) E/AndroidRuntime( 541): at android.view.ViewGroup.drawChild(ViewGroup.java:1529) E/AndroidRuntime( 541): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) E/AndroidRuntime( 541): at android.view.ViewGroup.drawChild(ViewGroup.java:1529) E/AndroidRuntime( 541): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) E/AndroidRuntime( 541): at android.view.ViewGroup.drawChild(ViewGroup.java:1529) E/AndroidRuntime( 541): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) E/AndroidRuntime( 541): at android.view.ViewGroup.drawChild(ViewGroup.java:1529) E/AndroidRuntime( 541): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) E/AndroidRuntime( 541): at android.view.View.draw(View.java:6538) E/AndroidRuntime( 541): at android.widget.FrameLayout.draw(FrameLayout.java:352) E/AndroidRuntime( 541): at android.view.ViewGroup.drawChild(ViewGroup.java:1531) E/AndroidRuntime( 541): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) E/AndroidRuntime( 541): at android.view.ViewGroup.drawChild(ViewGroup.java:1529) E/AndroidRuntime( 541): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) E/AndroidRuntime( 541): at android.view.View.draw(View.java:6538) E/AndroidRuntime( 541): at android.widget.FrameLayout.draw(FrameLayout.java:352) E/AndroidRuntime( 541): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1830) E/AndroidRuntime( 541): at android.view.ViewRoot.draw(ViewRoot.java:1349) E/AndroidRuntime( 541): at android.view.ViewRoot.performTraversals(ViewRoot.java:1114) E/AndroidRuntime( 541): at android.view.ViewRoot.handleMessage(ViewRoot.java:1633) E/AndroidRuntime( 541): at android.os.Handler.dispatchMessage(Handler.java:99) E/AndroidRuntime( 541): at android.os.Looper.loop(Looper.java:123) E/AndroidRuntime( 541): at android.app.ActivityThread.main(ActivityThread.java:4363) E/AndroidRuntime( 541): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime( 541): at java.lang.reflect.Method.invoke(Method.java:521) E/AndroidRuntime( 541): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) E/AndroidRuntime( 541): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) E/AndroidRuntime( 541): at dalvik.system.NativeStart.main(Native Method) I/Process ( 61): Sending signal. PID: 541 SIG: 3 I/dalvikvm( 541): threadid=7: reacting to signal 3 I/dalvikvm( 541): Wrote stack trace to '/data/anr/traces.txt' Anybody have any idea how I can get this content into a tab without crashing my application? My actual program is more complex and has more than one tab but I simplified it down to this in an attempt to find out why it's crashing but it still crashes and I don't know why. If I don't use LayoutInflator my program doesn't crash but I don't get any content either, just tabs.

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• Using Table-Valued Parameters in SQL Server

  - by Jesse

  I work with stored procedures in SQL Server pretty frequently and have often found myself with a need to pass in a list of values at run-time. Quite often this list contains a set of ids on which the stored procedure needs to operate the size and contents of which are not known at design time. In the past I’ve taken the collection of ids (which are usually integers), converted them to a string representation where each value is separated by a comma and passed that string into a VARCHAR parameter of a stored procedure. The body of the stored procedure would then need to parse that string into a table variable which could be easily consumed with set-based logic within the rest of the stored procedure. This approach works pretty well but the VARCHAR variable has always felt like an un-wanted “middle man” in this scenario. Of course, I could use a BULK INSERT operation to load the list of ids into a temporary table that the stored procedure could use, but that approach seems heavy-handed in situations where the list of values is usually going to contain only a few dozen values. Fortunately SQL Server 2008 introduced the concept of table-valued parameters which effectively eliminates the need for the clumsy middle man VARCHAR parameter. Example: Customer Transaction Summary Report Let’s say we have a report that can summarize the the transactions that we’ve conducted with customers over a period of time. The report returns a pretty simple dataset containing one row per customer with some key metrics about how much business that customer has conducted over the date range for which the report is being run. Sometimes the report is run for a single customer, sometimes it’s run for all customers, and sometimes it’s run for a handful of customers (i.e. a salesman runs it for the customers that fall into his sales territory). This report can be invoked from a website on-demand, or it can be scheduled for periodic delivery to certain users via SQL Server Reporting Services. Because the report can be created from different places and the query to generate the report is complex it’s been packed into a stored procedure that accepts three parameters: @startDate – The beginning of the date range for which the report should be run. @endDate – The end of the date range for which the report should be run. @customerIds – The customer Ids for which the report should be run. Obviously, the @startDate and @endDate parameters are DATETIME variables. The @customerIds parameter, however, needs to contain a list of the identity values (primary key) from the Customers table representing the customers that were selected for this particular run of the report. In prior versions of SQL Server we might have made this parameter a VARCHAR variable, but with SQL Server 2008 we can make it into a table-valued parameter. Defining And Using The Table Type In order to use a table-valued parameter, we first need to tell SQL Server about what the table will look like. We do this by creating a user defined type. For the purposes of this stored procedure we need a very simple type to model a table variable with a single integer column. We can create a generic type called ‘IntegerListTableType’ like this: CREATE TYPE IntegerListTableType AS TABLE (Value INT NOT NULL) Once defined, we can use this new type to define the @customerIds parameter in the signature of our stored procedure. The parameter list for the stored procedure definition might look like: 1: CREATE PROCEDURE dbo.rpt_CustomerTransactionSummary 2: @starDate datetime, 3: @endDate datetime, 4: @customerIds IntegerListTableTableType READONLY   Note the ‘READONLY’ statement following the declaration of the @customerIds parameter. SQL Server requires any table-valued parameter be marked as ‘READONLY’ and no DML (INSERT/UPDATE/DELETE) statements can be performed on a table-valued parameter within the routine in which it’s used. Aside from the DML restriction, however, you can do pretty much anything with a table-valued parameter as you could with a normal TABLE variable. With the user defined type and stored procedure defined as above, we could invoke like this: 1: DECLARE @cusomterIdList IntegerListTableType 2: INSERT @customerIdList VALUES (1) 3: INSERT @customerIdList VALUES (2) 4: INSERT @customerIdList VALUES (3) 5:  6: EXEC dbo.rpt_CustomerTransationSummary 7: @startDate = '2012-05-01', 8: @endDate = '2012-06-01' 9: @customerIds = @customerIdList   Note that we can simply declare a variable of type ‘IntegerListTableType’ just like any other normal variable and insert values into it just like a TABLE variable. We could also populate the variable with a SELECT … INTO or INSERT … SELECT statement if desired. Using The Table-Valued Parameter With ADO .NET Invoking a stored procedure with a table-valued parameter from ADO .NET is as simple as building a DataTable and passing it in as the Value of a SqlParameter. Here’s some example code for how we would construct the SqlParameter for the @customerIds parameter in our stored procedure: 1: var customerIdsParameter = new SqlParameter(); 2: customerIdParameter.Direction = ParameterDirection.Input; 3: customerIdParameter.TypeName = "IntegerListTableType"; 4: customerIdParameter.Value = selectedCustomerIds.ToIntegerListDataTable("Value");   All we’re doing here is new’ing up an instance of SqlParameter, setting the pamameters direction, specifying the name of the User Defined Type that this parameter uses, and setting its value. We’re assuming here that we have an IEnumerable<int> variable called ‘selectedCustomerIds’ containing all of the customer Ids for which the report should be run. The ‘ToIntegerListDataTable’ method is an extension method of the IEnumerable<int> type that looks like this: 1: public static DataTable ToIntegerListDataTable(this IEnumerable<int> intValues, string columnName) 2: { 3: var intergerListDataTable = new DataTable(); 4: intergerListDataTable.Columns.Add(columnName); 5: foreach(var intValue in intValues) 6: { 7: var nextRow = intergerListDataTable.NewRow(); 8: nextRow[columnName] = intValue; 9: intergerListDataTable.Rows.Add(nextRow); 10: } 11:  12: return intergerListDataTable; 13: }   Since the ‘IntegerListTableType’ has a single int column called ‘Value’, we pass that in for the ‘columnName’ parameter to the extension method. The method creates a new single-columned DataTable using the provided column name then iterates over the items in the IEnumerable<int> instance adding one row for each value. We can then use this SqlParameter instance when invoking the stored procedure just like we would use any other parameter. Advanced Functionality Using passing a list of integers into a stored procedure is a very simple usage scenario for the table-valued parameters feature, but I’ve found that it covers the majority of situations where I’ve needed to pass a collection of data for use in a query at run-time. I should note that BULK INSERT feature still makes sense for passing large amounts of data to SQL Server for processing. MSDN seems to suggest that 1000 rows of data is the tipping point where the overhead of a BULK INSERT operation can pay dividends. I should also note here that table-valued parameters can be used to deal with more complex data structures than single-columned tables of integers. A User Defined Type that backs a table-valued parameter can use things like identities and computed columns. That said, using some of these more advanced features might require the use the SqlDataRecord and SqlMetaData classes instead of a simple DataTable. Erland Sommarskog has a great article on his website that describes when and how to use these classes for table-valued parameters. What About Reporting Services? Earlier in the post I referenced the fact that our example stored procedure would be called from both a web application and a SQL Server Reporting Services report. Unfortunately, using table-valued parameters from SSRS reports can be a bit tricky and warrants its own blog post which I’ll be putting together and posting sometime in the near future.

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• Is it a good object-oriented-design practice to send a pointer to private data to another class?

  - by Denis

  Hello everyone, There is well known recommendation not to include into class interface method that returns a pointer (or a reference) to private data of the class. But what do you think about public method of a class that sends to another class a pointer to the private data of the first one. For example: class A { public: void fA(void) {_b.fB(&_var)}; private: B _b; int _var; }; I think that it is some sort of data hiding damage: the private data define state of their own class, so why should one class delegate changes of its own state to another one? What do you think? Denis

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• Does RVM "failover" to another ruby instance on error?

  - by JohnMetta

  Have a strange problem in that I have a Rake task that seems to be using multiple versions of Ruby. When one fails, it seems to try another one. Details MacBook running 10.6.5 rvm 1.1.0 Rubies: 1.8.7-p302, ree-1.8.7-2010.02, ruby-1.9.2-p0 Rake 0.8.7 Gem 1.3.7 Veewee (provisioning Virtual Machines using Opcode.com, Vagrant and Chef) I'm not entirely sure the specific details of the error matter, but since it might be an issue with Veewee itself. So, what I'm trying to do is build a new box base on a veewee definition. The command fails with an error about a missing method- but what's interesting is how it fails. Errors I managed to figure out that if I only have one Ruby installed with RVM, it just fails. If I have more than one Ruby install, it fails at the same place, but execution seems to continue in another interpreter. Here are two different clipped console outputs. I've clipped them for size. The full outputs of each error are available as a gist. One Ruby version installed Here is the command run when I only have a single version of Ruby (1.8.7) available in RVM boudica:veewee john$ rvm rake build['mettabox'] --trace rvm 1.1.0 by Wayne E. Seguin ([email protected]) [http://rvm.beginrescueend.com/] (in /Users/john/Work/veewee) ** Invoke build (first_time) ** Execute build … creating new harddrive rake aborted! undefined method `max_vdi_size' for #<VirtualBox::SystemProperties:0x102d6af80> /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/virtualbox-0.8.3/lib/virtualbox/abstract_model/dirty.rb:172:in `method_missing' <------ stacktraces cut ----------> /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/rake-0.8.7/bin/rake:31 /Users/john/.rvm/gems/ruby-1.8.7-p302@global/bin/rake:19:in `load' /Users/john/.rvm/gems/ruby-1.8.7-p302@global/bin/rake:19 Multiple Ruby Versions Here is the same command run with three versions of Ruby available in RVM. Prior to doing this, I used "rvm use 1.8.7." Again, I don't know how important the details of the specific errors are- what's interesting to me is that there are three separate errors- each with it's own stacktrace- and each in a different Ruby interpreter. Look at the bottom of each stacktrace and you'll see that they are all sourced from different interpreter locations- First ree-1.8.7, then ruby-1.8.7, then ruby-1.9.2: boudica:veewee john$ rvm rake build['mettabox'] --trace rvm 1.1.0 by Wayne E. Seguin ([email protected]) [http://rvm.beginrescueend.com/] (in /Users/john/Work/veewee) ** Invoke build (first_time) ** Execute build … creating new harddrive rake aborted! undefined method `max_vdi_size' for #<VirtualBox::SystemProperties:0x1059dd608> /Users/john/.rvm/gems/ree-1.8.7-2010.02/gems/virtualbox-0.8.3/lib/virtualbox/abstract_model/dirty.rb:172:in `method_missing' … /Users/john/.rvm/gems/ree-1.8.7-2010.02/gems/rake-0.8.7/bin/rake:31 /Users/john/.rvm/gems/ree-1.8.7-2010.02@global/bin/rake:19:in `load' /Users/john/.rvm/gems/ree-1.8.7-2010.02@global/bin/rake:19 (in /Users/john/Work/veewee) ** Invoke build (first_time) ** Execute build isofile ubuntu-10.04.1-server-amd64.iso is available ["a1b857f92eecaf9f0a31ecfc39dee906", "30b5c6fdddbfe7b397fe506400be698d"] [] Last good state: -1 Current step: 0 last good state -1 destroying machine+disks (re-)executing step 0-initial-a1b857f92eecaf9f0a31ecfc39dee906 VBoxManage: error: Machine settings file '/Users/john/VirtualBox VMs/mettabox/mettabox.vbox' already exists VBoxManage: error: Details: code VBOX_E_FILE_ERROR (0x80bb0004), component Machine, interface IMachine, callee nsISupports Context: "CreateMachine(bstrSettingsFile.raw(), name.raw(), osTypeId.raw(), Guid(id).toUtf16().raw(), FALSE , machine.asOutParam())" at line 247 of file VBoxManageMisc.cpp rake aborted! undefined method `memory_size=' for nil:NilClass /Users/john/Work/veewee/lib/veewee/session.rb:303:in `create_vm' /Users/john/Work/veewee/lib/veewee/session.rb:166:in `build' /Users/john/Work/veewee/lib/veewee/session.rb:560:in `transaction' /Users/john/Work/veewee/lib/veewee/session.rb:163:in `build' /Users/john/Work/veewee/Rakefile:87 /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/rake-0.8.7/lib/rake.rb:636:in `call' /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/rake-0.8.7/lib/rake.rb:636:in `execute' /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/rake-0.8.7/lib/rake.rb:631:in `each' … /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/rake-0.8.7/bin/rake:31 /Users/john/.rvm/gems/ruby-1.8.7-p302@global/bin/rake:19:in `load' /Users/john/.rvm/gems/ruby-1.8.7-p302@global/bin/rake:19 (in /Users/john/Work/veewee) ** Invoke build (first_time) ** Execute build isofile ubuntu-10.04.1-server-amd64.iso is available ["a9c4ab3257e1da3479c984eae9905c2a", "30b5c6fdddbfe7b397fe506400be698d"] [] Last good state: -1 Current step: 0 last good state -1 (re-)executing step 0-initial-a9c4ab3257e1da3479c984eae9905c2a VBoxManage: error: Machine settings file '/Users/john/VirtualBox VMs/mettabox/mettabox.vbox' already exists VBoxManage: error: Details: code VBOX_E_FILE_ERROR (0x80bb0004), component Machine, interface IMachine, callee nsISupports Context: "CreateMachine(bstrSettingsFile.raw(), name.raw(), osTypeId.raw(), Guid(id).toUtf16().raw(), FALSE , machine.asOutParam())" at line 247 of file VBoxManageMisc.cpp rake aborted! undefined method `memory_size=' for nil:NilClass /Users/john/Work/veewee/lib/veewee/session.rb:303:in `create_vm' /Users/john/Work/veewee/lib/veewee/session.rb:166:in `block in build' /Users/john/Work/veewee/lib/veewee/session.rb:560:in `transaction' /Users/john/Work/veewee/lib/veewee/session.rb:163:in `build' /Users/john/Work/veewee/Rakefile:87:in `block in <top (required)>' /Users/john/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rake.rb:634:in `call' /Users/john/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rake.rb:634:in `block in execute' … /Users/john/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rake.rb:2013:in `top_level' /Users/john/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rake.rb:1992:in `run' /Users/john/.rvm/rubies/ruby-1.9.2-p0/bin/rake:35:in `<main>' It isn't until we reach the last installed version of Ruby that execution halts. Discussion Does anyone have any idea what's going on here? Has anyone seen this "failover"-like behavior before? It seems strange to me that the first exception would not halt execution as it did with one interpreter, but I wonder if there are things happening when RVM is installed that we Ruby developers are not considering.

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• Is it possible to hide the tabbar when a button is pressed to allow a full screen view of the conten

  - by Jonah

  I have a UITabBar in the detail view of my navigation based application. I am storing text and images in a tableview and would like the user to be able to tap on a cell to hide the navigation controller and the tabbar for full screen viewing of the content. I found this code for hiding the top bars, but it does not seem as easy to hide the tabbar. [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES]; [self.navigationController setNavigationBarHidden:YES animated:YES]; Does anyone know how to do this? This code does not work to hide the tabBar once the view is already loaded. yourTabViewController.hidesBottomBarWhenPushed = YES;

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• C#: LINQ vs foreach - Round 1.

  - by James Michael Hare

  So I was reading Peter Kellner's blog entry on Resharper 5.0 and its LINQ refactoring and thought that was very cool.  But that raised a point I had always been curious about in my head -- which is a better choice: manual foreach loops or LINQ?    The answer is not really clear-cut.  There are two sides to any code cost arguments: performance and maintainability.  The first of these is obvious and quantifiable.  Given any two pieces of code that perform the same function, you can run them side-by-side and see which piece of code performs better.   Unfortunately, this is not always a good measure.  Well written assembly language outperforms well written C++ code, but you lose a lot in maintainability which creates a big techncial debt load that is hard to offset as the application ages.  In contrast, higher level constructs make the code more brief and easier to understand, hence reducing technical cost.   Now, obviously in this case we're not talking two separate languages, we're comparing doing something manually in the language versus using a higher-order set of IEnumerable extensions that are in the System.Linq library.   Well, before we discuss any further, let's look at some sample code and the numbers.  First, let's take a look at the for loop and the LINQ expression.  This is just a simple find comparison:       // find implemented via LINQ     public static bool FindViaLinq(IEnumerable<int> list, int target)     {         return list.Any(item => item == target);     }         // find implemented via standard iteration     public static bool FindViaIteration(IEnumerable<int> list, int target)     {         foreach (var i in list)         {             if (i == target)             {                 return true;             }         }           return false;     }   Okay, looking at this from a maintainability point of view, the Linq expression is definitely more concise (8 lines down to 1) and is very readable in intention.  You don't have to actually analyze the behavior of the loop to determine what it's doing.   So let's take a look at performance metrics from 100,000 iterations of these methods on a List<int> of varying sizes filled with random data.  For this test, we fill a target array with 100,000 random integers and then run the exact same pseudo-random targets through both searches.                       List<T> On 100,000 Iterations     Method      Size     Total (ms)  Per Iteration (ms)  % Slower     Any         10       26          0.00046             30.00%     Iteration   10       20          0.00023             -     Any         100      116         0.00201             18.37%     Iteration   100      98          0.00118             -     Any         1000     1058        0.01853             16.78%     Iteration   1000     906         0.01155             -     Any         10,000   10,383      0.18189             17.41%     Iteration   10,000   8843        0.11362             -     Any         100,000  104,004     1.8297              18.27%     Iteration   100,000  87,941      1.13163             -   The LINQ expression is running about 17% slower for average size collections and worse for smaller collections.  Presumably, this is due to the overhead of the state machine used to track the iterators for the yield returns in the LINQ expressions, which seems about right in a tight loop such as this.   So what about other LINQ expressions?  After all, Any() is one of the more trivial ones.  I decided to try the TakeWhile() algorithm using a Count() to get the position stopped like the sample Pete was using in his blog that Resharper refactored for him into LINQ:       // Linq form     public static int GetTargetPosition1(IEnumerable<int> list, int target)     {         return list.TakeWhile(item => item != target).Count();     }       // traditionally iterative form     public static int GetTargetPosition2(IEnumerable<int> list, int target)     {         int count = 0;           foreach (var i in list)         {             if(i == target)             {                 break;             }               ++count;         }           return count;     }   Once again, the LINQ expression is much shorter, easier to read, and should be easier to maintain over time, reducing the cost of technical debt.  So I ran these through the same test data:                       List<T> On 100,000 Iterations     Method      Size     Total (ms)  Per Iteration (ms)  % Slower     TakeWhile   10       41          0.00041             128%     Iteration   10       18          0.00018             -     TakeWhile   100      171         0.00171             88%     Iteration   100      91          0.00091             -     TakeWhile   1000     1604        0.01604             94%     Iteration   1000     825         0.00825             -     TakeWhile   10,000   15765       0.15765             92%     Iteration   10,000   8204        0.08204             -     TakeWhile   100,000  156950      1.5695              92%     Iteration   100,000  81635       0.81635             -     Wow!  I expected some overhead due to the state machines iterators produce, but 90% slower?  That seems a little heavy to me.  So then I thought, well, what if TakeWhile() is not the right tool for the job?  The problem is TakeWhile returns each item for processing using yield return, whereas our for-loop really doesn't care about the item beyond using it as a stop condition to evaluate. So what if that back and forth with the iterator state machine is the problem?  Well, we can quickly create an (albeit ugly) lambda that uses the Any() along with a count in a closure (if a LINQ guru knows a better way PLEASE let me know!), after all , this is more consistent with what we're trying to do, we're trying to find the first occurence of an item and halt once we find it, we just happen to be counting on the way.  This mostly matches Any().       // a new method that uses linq but evaluates the count in a closure.     public static int TakeWhileViaLinq2(IEnumerable<int> list, int target)     {         int count = 0;         list.Any(item =>             {                 if(item == target)                 {                     return true;                 }                   ++count;                 return false;             });         return count;     }     Now how does this one compare?                         List<T> On 100,000 Iterations     Method         Size     Total (ms)  Per Iteration (ms)  % Slower     TakeWhile      10       41          0.00041             128%     Any w/Closure  10       23          0.00023             28%     Iteration      10       18          0.00018             -     TakeWhile      100      171         0.00171             88%     Any w/Closure  100      116         0.00116             27%     Iteration      100      91          0.00091             -     TakeWhile      1000     1604        0.01604             94%     Any w/Closure  1000     1101        0.01101             33%     Iteration      1000     825         0.00825             -     TakeWhile      10,000   15765       0.15765             92%     Any w/Closure  10,000   10802       0.10802             32%     Iteration      10,000   8204        0.08204             -     TakeWhile      100,000  156950      1.5695              92%     Any w/Closure  100,000  108378      1.08378             33%     Iteration      100,000  81635       0.81635             -     Much better!  It seems that the overhead of TakeAny() returning each item and updating the state in the state machine is drastically reduced by using Any() since Any() iterates forward until it finds the value we're looking for -- for the task we're attempting to do.   So the lesson there is, make sure when you use a LINQ expression you're choosing the best expression for the job, because if you're doing more work than you really need, you'll have a slower algorithm.  But this is true of any choice of algorithm or collection in general.     Even with the Any() with the count in the closure it is still about 30% slower, but let's consider that angle carefully.  For a list of 100,000 items, it was the difference between 1.01 ms and 0.82 ms roughly in a List<T>.  That's really not that bad at all in the grand scheme of things.  Even running at 90% slower with TakeWhile(), for the vast majority of my projects, an extra millisecond to save potential errors in the long term and improve maintainability is a small price to pay.  And if your typical list is 1000 items or less we're talking only microseconds worth of difference.   It's like they say: 90% of your performance bottlenecks are in 2% of your code, so over-optimizing almost never pays off.  So personally, I'll take the LINQ expression wherever I can because they will be easier to read and maintain (thus reducing technical debt) and I can rely on Microsoft's development to have coded and unit tested those algorithm fully for me instead of relying on a developer to code the loop logic correctly.   If something's 90% slower, yes, it's worth keeping in mind, but it's really not until you start get magnitudes-of-order slower (10x, 100x, 1000x) that alarm bells should really go off.  And if I ever do need that last millisecond of performance?  Well then I'll optimize JUST THAT problem spot.  To me it's worth it for the readability, speed-to-market, and maintainability.

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