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• Long running method causing race condition

  - by keeleyt83

  Hi, I'm relatively new with hibernate so please be gentle. I'm having an issue with a long running method (~2 min long) and changing the value of a status field on an object stored in the DB. The pseudo-code below should help explain my issue. public foo(thing) { if (thing.getStatus() == "ready") { thing.setStatus("finished"); doSomethingAndTakeALongTime(); } else { // Thing already has a status of finished. Send the user back a message. } } The pseudo-code shouldn't take much explanation. I want doSomethingAndTakeALongTime() to run, but only if it has a status of "ready". My issue arises whenever it takes 2 minutes for doSomethingAndTakeALongTime() to finish and the change to thing's status field doesn't get persisted to the database until it leaves foo(). So another user can put in a request during those 2 minutes and the if statement will evaluate to true. I've already tried updating the field and flushing the session manually, but it didn't seem to work. I'm not sure what to do from here and would appreciate any help. PS: My hibernate session is managed by spring.

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• Which web framework or technologies would suit me?

  - by Suraj Chandran

  Hi, I had been working on desktop apps and server side(non web) for some time and now I am diving in to web first time. I plan to write a scalable enterprise level app. I have worked with Java, Javascript, Jquery etc. but I absolutely hate jsp. So is there any framework that focuses on developing enterprise level web apps without jsp. I liked Wicket's approach, but I think there is a little lack of support of dynamic html in it and jquery(yes i looked at wiquery). Also I feel making wicket apps scalable would take some sweat. Can Spring MVC, Struts2 etc. help me make with this with just using say Java, JavaScript, and JQuery. Or are there any other options for me like Wicket. Please do forgive if anything above looks insane, I am still working on my understanding with enterprise web apps. NOTE: If you think that I should take a different direction or approach, please do suggest!

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• (JBoss) Problem with .war project on production, while test works

  - by ikky

  Hello. I have a java project (using Spring mvc) which i have built and deployed on my local computer. It runs on a JBoss application server, and works fine on the local machine. The next step i do, is to copy the deployed project.war from the local machine to the server which has the same development environment as the local machine. I stop the JBoss server, delete the cache, and run the JBoss server again. When i now try to run one of the pages(xx.xxx.xxx:8080/webservice/test.htm), i get this exception: exception org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:583) root cause java.lang.NullPointerException com.project.db.DBCustomer.isCredentialsCorrect(DBCustomer.java:44) com.project.CreateHController.handleRequest(CreateHController.java:60) org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:501) javax.servlet.http.HttpServlet.service(HttpServlet.java:697) javax.servlet.http.HttpServlet.service(HttpServlet.java:810) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:75) It seems like none of my classes are reachable. Does anyone have any idea of what is wrong? btw: as i said, the project works fine on the local machine.

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• "Detecting" and loading of "plugins" in GAE

  - by Patrick Cornelissen

  Hi! I have a "plugin like" architecture and I want to create one instance of each class that implements a dedicated interface and put these in a cache. (To have a singleton-ish effect). The plugins will be provided as jars and put into the app engine war file before the app is uploaded. I have tried to use the ClassPathScanningCandidateComponentProvider as I'm using spring anyway, but this didn't work. The provider complained that it was not able to find the HttpServletResponse class file while scanning the classpath. I can't get around this, when I add the servlet jar, then I'll get of course problems, because the same jar is also provided by the GAE. If I don't, I'm getting the error above... So I tried to add a static initialization code, but of course this doesn't work, because the class is initialized when it's instantiated for the first time. (Well I knew that but it was worth a try) The last chance I currently see is that I create a properties file with all plugin classes when the package is created, but this requires writing of a maven plugin etc. and I'd like to avoid that. Is there something that I am missing?

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• JPA returning null for deleted items from a set

  - by Jon

  This may be related to my question from a few days ago, but I'm not even sure how to explain this part. (It's an entirely different parent-child relationship.) In my interface, I have a set of attributes (Attribute) and valid values (ValidValue) for each one in a one-to-many relationship. In the Spring MVC frontend, I have a page for an administrator to edit these values. Once it's submitted, if any of these fields (as <input> tags) are blank, I remove the ValidValue object like so: Set<ValidValue> existingValues = new HashSet<ValidValue>(attribute.getValidValues()); Set<ValidValue> finalValues = new HashSet<ValidValue>(); for(ValidValue validValue : attribute.getValidValues()) { if(!validValue.getValue().isEmpty()) { finalValues.add(validValue); } } existingValues.removeAll(finalValues); for(ValidValue removedValue : existingValues) { getApplicationDataService().removeValidValue(removedValue); } attribute.setValidValues(finalValues); getApplicationDataService().modifyAttribute(attribute); The problem is that while the database is updated appropriately, the next time I query for the Attribute objects, they're returned with an extra entry in their ValidValue set -- a null, and thus, the next time I iterate through the values to display, it shows an extra blank value in the middle. I've confirmed that this happens at the point of a merge or find, at the point of "Execute query ReadObjectQuery(entity.Attribute). Here's the code I'm using to modify the database (in the ApplicationDataService): public void modifyAttribute(Attribute attribute) { getJpaTemplate().merge(attribute); } public void removeValidValue(ValidValue removedValue) { ValidValue merged = getJpaTemplate().merge(removedValue); getJpaTemplate().remove(merged); } Here are the relevant parts of the entity classes: Entity @Table(name = "attribute") public class Attribute { @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "attribute") private Set<ValidValue> validValues = new HashSet<ValidValue>(0); } @Entity @Table(name = "valid_value") public class ValidValue { @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "attr_id", nullable = false) private Attribute attribute; }

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• How to get around LazyInitializationException in scheduled jobs?

  - by Shreerang

  I am working on a J2EE server application which is deployed on Tomcat. I use Spring source as MVC framework and Hibernate as ORM provider. My object model has lot of Lazy relationships (dependent objects are fetched on request). The high level design is like Service level methods call a few DAO methods to perform database operation. The service method is called either from the Flex UI or as a scheduled job. When it is called from Flex UI, the service method works fine i.e. it fetches some objects using DAO methods and even Lazy loading works. This is possible by the use of OpenSessionInViewFilter configured with the UI servlet. But when the same service method is called as scheduled Job, it gives LazyInitializationException. I can not configure OpenSessionInViewFilter because there is no servlet or UI request associated with that. I tried configuring Transaction around the scheduled job method so that service method starts a transaction and all the DAO methods participate in that same transaction, hoping that the transaction will remain active and hibernate session will be available. But it does not work. Please suggest if anyone has ever been able to get such a configuration working. If needed, I can post the Hibernate configuration and log messages. Thanks a lot for help! Shreerang

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• Pattern for version-specific implementations of a Java class

  - by Mike Monkiewicz

  So here's my conundrum. I am programming a tool that needs to work on old versions of our application. I have the code to the application, but can not alter any of the classes. To pull information out of our database, I have a DTO of sorts that is populated by Hibernate. It consumes a data object for version 1.0 of our app, cleverly named DataObject. Below is the DTO class. public class MyDTO { private MyWrapperClass wrapper; public MyDTO(DataObject data) { wrapper = new MyWrapperClass(data); } } The DTO is instantiated through a Hibernate query as follows: select new com.foo.bar.MyDTO(t1.data) from mytable t1 Now, a little logic is needed on top of the data object, so I made a wrapper class for it. Note the DTO stores an instance of the wrapper class, not the original data object. public class MyWrapperClass { private DataObject data; public MyWrapperClass(DataObject data) { this.data = data; } public String doSomethingImportant() { ... version-specific logic ... } } This works well until I need to work on version 2.0 of our application. Now DataObject in the two versions are very similar, but not the same. This resulted in different sub classes of MyWrapperClass, which implement their own version-specific doSomethingImportant(). Still doing okay. But how does myDTO instantiate the appropriate version-specific MyWrapperClass? Hibernate is in turn instantiating MyDTO, so it's not like I can @Autowire a dependency in Spring. I would love to reuse MyDTO (and my dozens of other DTOs) for both versions of the tool, without having to duplicate the class. Don't repeat yourself, and all that. I'm sure there's a very simple pattern I'm missing that would help this. Any suggestions?

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• Locking database edit by key name

  - by Will Glass

  I need to prevent simultaneous edits to a database field. Users are executing a push operation on a structured data field, so I want to sequence the operations, not simply ignore one edit and take the second. Essentially I want to do synchronized(key name) { push value onto the database field } and set up the synchronized item so that only one operation on "key name" will occur at a time. (note: I'm simplifying, it's not always a simple push). A crude way to do this would be a global synchronization, but that bottlenecks the entire app. All I need to do is sequence two simultaneous writes with the same key, which is rare but annoying occurrence. This is a web-based java app, written with Spring (and using JPA/MySQL). The operation is triggered by a user web service call. (the root cause is when a user sends two simultaneous http requests with the same key). I've glanced through the Doug Lea/Josh Bloch/et al Concurrency in Action, but don't see an obvious solution. Still, this seems simple enough I feel there must be an elegant way to do this.

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• SpringMvc java.lang.NullPointerException When Posting Form To Server

  - by dev_darin

  I have a form with a user name field on it when i tab out of the field i use a RESTFUL Web Service that makes a call to a handler method in the controller. The method makes a call to a DAO class that checks the database if the user name exists. This works fine, however when the form is posted to the server i call the same exact function i would call in the handler method however i get a java.lang.NullPointerException when it accesses the class that makes a call to the DAO object. So it does not even access the DAO object the second time. I have exception handlers around the calls in all my classes that makes calls. Any ideas as to whats happening here why i would get the java.lang.NullPointerException the second time the function is called.Does this have anything to do with Spring instantiating DAO classes using a Singleton method or something to that effect? What can be done to resolve this? This is what happens the First Time The Method is called using the Web Service(this is suppose to happen): 13011 [http-8084-2] INFO com.crimetrack.jdbc.JdbcOfficersDAO - Inside jdbcOfficersDAO 13031 [http-8084-2] DEBUG org.springframework.jdbc.core.JdbcTemplate - Executing prepared SQL query 13034 [http-8084-2] DEBUG org.springframework.jdbc.core.JdbcTemplate - Executing prepared SQL statement [SELECT userName FROM crimetrack.tblofficers WHERE userName = ?] 13071 [http-8084-2] DEBUG org.springframework.jdbc.datasource.DataSourceUtils - Fetching JDBC Connection from DataSource 13496 [http-8084-2] DEBUG org.springframework.jdbc.core.StatementCreatorUtils - Setting SQL statement parameter value: column index 1, parameter value [adminz], value class [java.lang.String], SQL type unknown 13534 [http-8084-2] DEBUG org.springframework.jdbc.datasource.DataSourceUtils - Returning JDBC Connection to DataSource 13537 [http-8084-2] INFO com.crimetrack.jdbc.JdbcOfficersDAO - No username was found in exception 13537 [http-8084-2] INFO com.crimetrack.service.ValidateUserNameManager - UserName :adminz does NOT exist The Second time When The Form Is 'Post' and a validation method handles the form and calls the same method the web service would call: 17199 [http-8084-2] INFO com.crimetrack.service.OfficerRegistrationValidation - UserName is not null so going to check if its valid for :adminz 17199 [http-8084-2] INFO com.crimetrack.service.OfficerRegistrationValidation - User Name in try.....catch block is adminz 17199 [http-8084-2] INFO com.crimetrack.service.ValidateUserNameManager - Inside Do UserNameExist about to validate with username : adminz 17199 [http-8084-2] INFO com.crimetrack.service.ValidateUserNameManager - UserName :adminz EXCEPTION OCCURED java.lang.NullPointerException

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• How to create a separate thread to do some operation periodically and update UI in WPF?I'm stack

  - by black sensei

  Hello Experts! I'm trying to do a periodic separated thread operation let's say check for internet connection or check for user's info via web service and update the user interface. i've tried with quartz.net to implement that.So i created an inner class for the window i need to update.That inner class does what is meant for but the problem is that i don't know how to access parent's(window class) members form the child(inner class). for example public partial class Window2 : Window { private int i; public Window2() { InitializeComponent(); } public string doMyOperation() { //code here return result; } public class Myclass :IJob { public void Execute(JobExecutionContext context) { string result = doMyOperation(); //Now here i could be able to call a label of name lblNotif //lblNotif.Content = result; } } } Well the whole idea works but i'm stacked at here i need to access a controls of Window2 Since i'm stacked i tried Spring.Net way of implementing Quartz hoping that i could use MethodInvokingJobDetailFactoryObject and rather have the Operation done on Window2 itself.But for some reason i'm having an exception Cannot resolve type [System.Windows.Window2,System.Windows];, could not load type from string value System.Windows.Window2,System.Windows and the wiring is done so <object name="UpdateLabelJob" type="System.Windows.Window2,System.Windows"/> What i'm i doing wrong here?Is that a way round? thanks for reading and for helping out

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• PropertyPlaceholderConfigurer works from Maven command line, but not from Eclipse?

  - by HDave

  I have Eclipse configured to use an external maven instance. Nonetheless I have an integration test that runs fine from the command line, but fails from within Eclipse. The error is a class Spring application context bean error: Cannot convert value of type [java.lang.String] to required type The culprit it a bean that sets property values using a PropertyPlaceholderConfigurer. <!-- property settings for non-JNDI database connections --> <bean id="placeholderConfigUuid" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" /> <property name="location" value="classpath:database.properties" /> <property name="placeholderPrefix" value="$DS{" /> </bean> I know which bean is failing because it appears in the stack trace and because when I replace the $DS{hibernate.dialect} with a static value it works. I have two questions: 1) Since M2Eclipse is using the same Maven setup as the command line, why does one work and the other fail? 2) How to fix this? I really like the ability to run a single jUnit test from within Eclipse on demand.

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• Testing Hibernate DAO, without building the universe around it.

  - by Varun Mehta

  We have an application built using spring/Hibernate/MySQL, now we want to test the DAO layer, but here are a few shortcomings we face. Consider the use case of multiple objects connected to one another, eg: Book has Pages. The Page object cannot exist without the Book as book_id is mandatory FK in Page. For testing a Page I have to create a Book. This simple usecase is easy to manage, but if you start building a Library, till you don't create the whole universe surrounding the Book and Page, you cannot test it! So to test Page; Create Library Create Section Create Genre Create Author Create Book Create Page Now test Page. Is there an easy way to by pass this "universe creation" and just test he page object in isolation. I also want to be able to test HQLs related to Page. eg: SELECT new com.test.BookPage (book.id, page.name) FROM Book book, Page page. JUnit is supposed to run in isolation, so I have to write the whole test case to create the Page. Any tips will be useful.

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• How do you add annotations to an image in Qt?

  - by Bruce

  Does Qt support textual annotations of images as part of its object library?

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• Is it possible to use Data Annotations to validate parameters passed to an Action method of a Contro

  - by dannie.f

  I am using Data Annotations to validate my Model in ASP.NET MVC. This works well for action methods that has complex parameters e.g, public class Params { [Required] string Param1 {get; set;} [StringLength(50)] string Param2 {get; set;} } ActionResult MyAction(Params params) { If(ModeState.IsValid) { // Do Something } } What if I want to pass a single string to an Action Method (like below). Is there a way to use Data Annotations or will I have to wrap the string into a class? ActionResult MyAction(string param1, string param2) { If(ModeState.IsValid) { // Do Something } }

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• Is there a way to specify java annotations in antlr grammar files?

  - by Steve B.

  I'm looking for a way to include a few additional strings in output .java files generated from antlr. Is there a comprehensive listing of available directives? For example, given parser output like this: package com.foo.bar; //<-- this can be generated with @header { .... } //antlr generated import org.antlr.runtime.*; ... //<-- is there a way to generate anything here? public class MyParser { //<--- or here? public void f1(){ ... } } Is there a way to generate strings that appear after the import statements (e.g. class-level annotations) or possibly method annotations?

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• Struts 1 ActionForm - retrieving a collection from pure HTML

  - by Yaneeve

  Hi all I have (just like the rest) inherited some struts 1 code. I have had need to add a few more pages to this project. What I cannot figure out is how to map several distinct but similarly natured input elements to the my ActionForm. Let me elaborate. I create a new <Input> element dynamically as the user inputs more and more items (I use the YUI autocomplete form element and for each entered input I add it as an input element to my form and draw a new YUI autocomplete - complex sounding, I know) So... My form looks a bit like (... after some prettifying and some such...): <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <title>My Cool App - Test Case Builder</title> <link rel="stylesheet" type="text/css" href="../script/yui/fonts/fonts-min.css" /> <link rel="stylesheet" type="text/css" href="../skins/myCoolApp/button/button.css" /> <link rel="stylesheet" type="text/css" href="../script/yui/autocomplete/assets/skins/sam/autocomplete.css" /> <link rel="stylesheet" type="text/css" media="screen" href="../skins/myCoolApp/testcase.css" /> <!-- YUI JAVA SCRIPTS --> <script type="text/javascript" src="../script/yui/yahoo-dom-event/yahoo-dom-event.js"></script> <script type="text/javascript" src="../script/yui/element/element-min.js"></script> <script type="text/javascript" src="../script/yui/button/button-min.js"></script> <script type="text/javascript" src="../script/yui/datasource/datasource-min.js"></script> <script type="text/javascript" src="../script/yui/autocomplete/autocomplete-min.js"></script> <!-- APP JAVA SCRIPTS --> <script type="text/javascript" src="../script/myCoolApp/myCoolApp.js" ></script> <script type="text/javascript" src="../script/myCoolApp/stack.js" ></script> <script type="text/javascript" src="../script/myCoolApp/testcase/testcase.js"></script> <script type="text/javascript" src="../script/myCoolApp/testcase/default-data.js" ></script> <script type="text/javascript" src="../script/myCoolApp/testcase/data-structs.js" ></script> <script type="text/javascript" src="../script/myCoolApp/testcase/ui-elements.js" ></script> </head> <body class="cf010"> <div id="wrap"> <div id="header"> <div id="main-header"> COOL APP </div> </div> <div id="main-body"> <div id="content"> <div class="col main"> <div id="main"> <form method="post" id="testcaseForm" class="typea" action=""> <fieldset> <legend>Test Case Builder</legend> <div id="tk1" class="tabcontrol"> <ul class="tabs"> <li class="first active"> <a href="#"> <span>General</span> </a> </li> <li class="last"> <a href="#"> <span>Parameters</span> </a> </li> </ul> <div id="tab0" class="tc-panel"> <dl class="cls9"> <dt> <label for="scenario">Choose Scenario:</label> </dt> <dd> <input type="text" id="scenario" name="scenario" class="text" /> <span id="scenarioToggle"></span> <div class="auto-complete" id="scenarioContainer"></div> </dd> <dt> <label for="ruleID">Choose Rule ID:</label> </dt> <dd> <input type="text" id="ruleID" name="ruleID" class="text" /> <span id="ruleIDToggle"></span> <div class="auto-complete" id="ruleIDContainer"></div> </dd> <dt> <label for="Test Case Name" accesskey="t"><span class="accesskey">T</span>est Case Name:</label> </dt> <dd> <input type="text" id="testCaseName" name="testCaseName" class="text" /> </dd> </dl> </div> <div id="tab1" class="tc-panel hidden"> <div class="toolbar" id="action-bar"> <ul> <li class="first"> <a title="select all" href="#" id="btmSelectAll" class="button"> <span>select all</span> </a> </li> <li> <a title="remove row" href="#" id="btmRemove" class="button"> <span>remove row</span> </a> </li> <li> <a title="undo last" href="#" id="btmRollBack" class="button disabled"> <span>undo last</span> </a> </li> <li class="last"> <a title="accept row" href="#" id="btmAccept" class="button disabled"> <span>accept row</span> </a> </li> </ul> </div> <div id="param.list" class="gridclip"> <table id='param.list.tbl' class='grid modela' > <caption>Test Case Summary</caption> <col/><col/><col/> <thead> <tr> <th class='hl center first'> <input class='grid-select-all' type='checkbox' /> <th> <th scope='col'>Row</th> <th scope='col'>Parameter</th> <th scope='col' class='last'>Value</th> </tr> </thead> <tfoot> <tr> <th scope='row'>Total</th> <td colspan='3'>2 parameters as Test Case input</td> </tr> </tfoot> <tbody id='param.list.tbl.body'> <tr class='odd'> <td class='rowcheck center first'> <input value='param1###value1' id='cb1' name='SelectedRows' class='grid-select-row' type='checkbox'/> </td> <td class='id'>1</td> <td>param1</td> <td class='last'>value1</td> </tr> <tr class='even'> <td class='rowcheck center first'> <input value='param2###value2' id='cb1' name='SelectedRows' class='grid-select-row' type='checkbox'/> </td> <td class='id'>2</td> <td>param2</td> <td class='last'>value2</td> </tr> <tr class='odd'> <td class='rowcheck center first' /> <td class='id'><em>new</em></td> <td> <dl class='clsTable'> <dt> <input type='text' id='param' name='param' class='text paramInput' /> </dt> <dd> <span id='paramToggle' /> </dd> <div class='auto-complete' id='paramContainer' /> </dl> </td> <td class='last'> <dl class='clsTable'> <dt> <input type='text' id='value' name='value' class='text valueInput' /> </dt> </dl> </td> </tr> </tbody> </table> </div> </div> </div> <!-- tabcontrol --> </fieldset> <div class="submit-box"> <input type="submit" name="formRun" id="formRun" class="form-save" value="Execute" accesskey="x" title="Run: Press Alt + [Shift] + x" /> <input type="submit" name="formSave" id="formSave" value="Save" accesskey="s" title="Save: Press Alt + [Shift] + s" /> <input type="submit" name="formLoad" id="formLoad" value="Load" accesskey="l" title="Load: Press Alt + [Shift] + l" /> <input type="submit" name="formCancel" id="formCancel" class="form-cancel" value="Cancel" accesskey="c" title="Cancel: Press Alt + [Shift] + c" /> </div> </form> </div> </div> </div> </div> </div> </body> </html> As you can see the following is pretty much a duplicate: <tr class='odd'> <td class='rowcheck center first'> <input value='param1###value1' id='cb1' name='SelectedRows' class='grid-select-row' type='checkbox'/> </td> <td class='id'>1</td> <td>param1</td> <td class='last'>value1</td> </tr> <tr class='even'> <td class='rowcheck center first'> <input value='param2###value2' id='cb1' name='SelectedRows' class='grid-select-row' type='checkbox'/> </td> <td class='id'>2</td> <td>param2</td> <td class='last'>value2</td> </tr> The relevant part of my stuts-config.xml file is: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd"> <struts-config> <data-sources /> <form-beans> <form-bean name="TestCaseForm" type="com.blahblah.mycoolapp.forms.TestCaseForm" /> </form-beans> <action-mappings> <action path="/pages/SaveTestCase" name="TestCaseForm" type="org.springframework.web.struts.DelegatingActionProxy" scope="request"> </action> </action-mappings> <message-resources parameter="MessageResources" /> </struts-config> I also use spring 2.56 (The relevant part being): <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <bean name="/pages/SaveTestCase" class="com.blahblah.mycoolapp.actions.TestCaseBuilderSaveAction" /> </beans> My Java ActionForm class (from what I had learned off the net) is: package com.blahblah.mycoolapp.forms; import java.util.ArrayList; import java.util.List; import org.apache.struts.action.ActionForm; public class TestCaseForm extends ActionForm { private static final long serialVersionUID = 2352146257739099766L; private String scenario; private String ruleID; private String testCaseName; private List<String> SelectedRows = new ArrayList<String>() ; public String getScenario() { return scenario; } public void setScenario(String scenario) { this.scenario = scenario; } public String getRuleID() { return ruleID; } public void setRuleID(String ruleID) { this.ruleID = ruleID; } public String getTestCaseName() { return testCaseName; } public void setTestCaseName(String testCaseName) { this.testCaseName = testCaseName; } public List<String> getSelectedRows() { return SelectedRows; } public void setSelectedRows(int index, String value) { this.SelectedRows.add(value); } } The question is why do I get an empty SelectedRows in my TestCaseBuilderSave Action? Thanks all who have the patience to read such a long question... and (hopefully) thanks to all you potential saviors :)

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• Implementing EAV pattern with Hibernate for User -> Settings relationship

  - by Trevor

  I'm trying to setup a simple EAV pattern in my web app using Java/Spring MVC and Hibernate. I can't seem to figure out the magic behind the hibernate XML setup for this scenario. My database table "SETUP" has three columns: user_id (FK) setup_item setup_value The database composite key is made up of user_id | setup_item Here's the Setup.java class: public class Setup implements CommonFormElements, Serializable { private Map data = new HashMap(); private String saveAction; private Integer speciesNamingList; private User user; Logger log = LoggerFactory.getLogger(Setup.class); public String getSaveAction() { return saveAction; } public void setSaveAction(String action) { this.saveAction = action; } public User getUser() { return user; } public void setUser(User user) { this.user = user; } public Integer getSpeciesNamingList() { return speciesNamingList; } public void setSpeciesNamingList(Integer speciesNamingList) { this.speciesNamingList = speciesNamingList; } public Map getData() { return data; } public void setData(Map data) { this.data = data; } } My problem with the Hibernate setup, is that I can't seem to figure out how to map out the fact that a foreign key and the key of a map will construct the composite key of the table... this is due to a lack of experience using Hibernate. Here's my initial attempt at getting this to work: <composite-id> <key-many-to-one foreign-key="id" name="user" column="user_id" class="Business.User"> <meta attribute="use-in-equals">true</meta> </key-many-to-one> </composite-id> <map lazy="false" name="data" table="setup"> <key column="user_id" property-ref="user"/> <composite-map-key class="Command.Setup"> <key-property name="data" column="setup_item" type="string"/> </composite-map-key> <element column="setup_value" not-null="true" type="string"/> </map> Any insight into how to properly map this common scenario would be most appreciated!

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• Problem with JSON, Struts 2 and Ajax.

  - by Javi

  Hello, I have an apllication with Struts 2, Spring and I want to send JSON as a response to an Ajax request, but my server in not sending the JSON in the response. I have this base package: <package name="myApp-default" extends="struts-default"> <result-types> <result-type name="tiles" class="org.apache.struts2.views.tiles.TilesResult" /> <result-type name="json" class="com.googlecode.jsonplugin.JSONResult"> <param name="enableGZIP">true</param> <param name="noCache">true</param> <param name="defaultEncoding">ISO-8859-1</param> </result-type> </result-types> </package> And another package which extends the previous one. <package namespace="/rest" name="rest" extends="myApp-default"> <action name="login" class="restAction" method="login"> <result type="json"/> </action> So I call with jQuery Ajax and debugging it I see it enters in the Action restAction in the method login and it also enters in the method getJsonData() because I have set two breakpoints and the program is stopped first in login and then in getJsonData. public class RestAction extends BaseAction { private String login; private String password; private String jsonData; public String login() { jsonData = "changed"; return Action.SUCCESS; } //I ommit getter/setters for login and password @JSON(name="jsonData") public String getJsonData() { return jsonData; } public void setJsonData(String jsonData) { this.jsonData = jsonData; } } My ajax looks like this: $.ajax({type: 'GET', url: this_url, data: pars, cache:false, success: handleResponse, error: handleError}); With firebug I see that the response to my request is completely void (though I have seen that the data saved in pars variable has been populated to the action and the methods have been executed correctly). And maybe for that reason my ajax enters in my handleError function where xmlHttpRequest.readyState is 4 and xmlHttpRequest.status is 0. Can anyone tell me what may the problem be? Thanks.

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• Brainstorming: Weird JPA problem, possibly classpath or jar versioning problem???

  - by Vinnie

  I'm seeing a weird error message and am looking for some ideas as to what the problem could be. I'm sort of new to using the JPA. I have an application where I'm using Spring's Entity Manager Factory (LocalContainerEntityManagerFactoryBean), EclipseLink as my ORM provider, connected to a MySQL DB and built with Maven. I'm not sure if any of this matters..... When I deploy this application to Glassfish, the application works as expected. The problem is, I've created a set of stand alone unit tests to run outside of Glassfish that aren't working correctly. I get the following error (I've edited the class names a little) com.xyz.abc.services.persistence.entity.MyEntity cannot be cast to com.xyz.abc.services.persistence.entity.MyEntity The object cannot be cast to a class of the same type? How can that be? Here's a snippet of the code that is in error Query q = entityManager.createNamedQuery("MyEntity.findAll"); List entityObjects = q.getResultList(); for (Object entityObject: entityObjects) { com.xyz.abc.services.persistence.entity.MyEntity entity = (com.xyz.abc.services.persistence.entity.MyEntity) entityObject; Previously, I had this code that produced the same error: CriteriaQuery cq = entityManager.getCriteriaBuilder().createQuery(); cq.select(cq.from(com.xyz.abc.services.persistence.entity.MyEntity.class)); List entityObjects = entityManager.createQuery(cq).getResultList(); for (Object entityObject: entityObjects) { com.xyz.abc.services.persistence.entity.MyEntity entity = (com.xyz.abc.services.persistence.entity.MyEntity) entityObject; This code is question is the same that I have deployed to the server. Here's the innermost exception if it helps Caused by: java.lang.ClassCastException: com.xyz.abc.services.persistence.entity.MyEntity cannot be cast to com.xyz.abc.services.persistence.entity.MyEntity at com.xyz.abc.services.persistence.entity.factory.MyEntityFactory.createBeans(MyEntityFactory.java:47) 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.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:115) ... 37 more I'm guessing that there's some jar I'm using in Glassfish that is different than the ones I'm using in test. I've looked at all the jars I have listed as "provided" and am pretty sure they are all the same ones from Glassfish. Let me know if you've seen this weird issue before, or any ideas for correcting it.

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• Error creating bean with name 'sessionFactory'

  - by Sunny Mate

  hi i am getting the following exception while running my application and my applicationContext.xml is <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver"> </property> <property name="url" value="jdbc:mysql://localhost/SureshDB"></property> <property name="username" value="root"></property> <property name="password" value="root"></property> </bean> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property name="dataSource"> <ref bean="dataSource" /> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect"> org.hibernate.dialect.MySQLDialect </prop> </props> </property> <property name="mappingResources"> <list> <value>com/jsfcompref/register/UserTa.hbm.xml</value></list> </property></bean> <bean id="UserTaDAO" class="com.jsfcompref.register.UserTaDAO"> <property name="sessionFactory"> <ref bean="sessionFactory" /> </property> </bean> <bean id="UserTaService" class="com.jsfcompref.register.UserTaServiceImpl"> <property name="userTaDao"> <ref bean="UserTaDAO"/> </property> </bean> </beans> Error creating bean with name 'sessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.NoSuchMethodError: org.objectweb.asm.ClassVisitor.visit(IILjava/lang/String;Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;)V any suggestion would be heplful

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• NoSuchMessageException: No message found

  - by adisembiring

  Hi .... I try to learn Spring MVC 3.0 validation. but I got NoSuchMessageException: No message found under code 'name.required' for locale 'en_US' error message when form submted. I have create message.properties in src/message.properties and the content of that file is: name.required = User Name is required password.required = Password is required gender.required = Gender is required I have set ResourceBundleMessageSource in my app-servlet.xml <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource" p:basename="messages" /> My validator code is: @Component("registrationValidator") public class RegistrationValidator implements Validator { @Override public boolean supports(Class<?> clazz) { return RegistrationCommand.class.isAssignableFrom(clazz); } @Override public void validate(Object target, Errors errors) { RegistrationCommand registrationCommand = (RegistrationCommand) target; ValidationUtils.rejectIfEmptyOrWhitespace(errors, "name", "name.required"); ValidationUtils.rejectIfEmptyOrWhitespace(errors, "password", "password.required"); ValidationUtils.rejectIfEmpty(errors, "gender", "gender.required"); ValidationUtils.rejectIfEmpty(errors, "country", "country.required"); //ValidationUtils.rejectIfEmpty(errors, "community", "community.required"); ValidationUtils.rejectIfEmptyOrWhitespace(errors, "description", "description.required"); if (registrationCommand.getCommunity().length == 0) { errors.rejectValue("community", "community.required"); } } } and JSP Page is: <form:form commandName="registrationCommand"> <p class="name"> <label for="name">Name</label> <form:input path="name" /> <form:errors path="name" cssClass="error"></form:errors> </p> <p class="password"> <label for="password">Password</label> <form:password path="password" /> <form:errors path="password" cssClass="error"></form:errors> </p> <p class="gender"> <label>Gender</label> <form:radiobutton path="gender" value="M" label="M" /> <form:radiobutton path="gender" value="F" label="F" /> <form:errors path="gender" cssClass="error"></form:errors> </p> <p class="submit"> <input type="submit" value="Submit" /> </p> </form:form>

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• Constructor versus setter injection

  - by Chris

  Hi, I'm currently designing an API where I wish to allow configuration via a variety of methods. One method is via an XML configuration schema and another method is through an API that I wish to play nicely with Spring. My XML schema parsing code was previously hidden and therefore the only concern was for it to work but now I wish to build a public API and I'm quite concerned about best-practice. It seems that many favor javabean type PoJo's with default zero parameter constructors and then setter injection. The problem I am trying to tackle is that some setter methods implementations are dependent on other setter methods being called before them in sequence. I could write anal setters that will tolerate themselves being called in many orders but that will not solve the problem of a user forgetting to set the appropriate setter and therefore the bean being in an incomplete state. The only solution I can think of is to forget about the objects being 'beans' and enforce the required parameters via constructor injection. An example of this is in the default setting of the id of a component based on the id of the parent components. My Interface public interface IMyIdentityInterface { public String getId(); /* A null value should create a unique meaningful default */ public void setId(String id); public IMyIdentityInterface getParent(); public void setParent(IMyIdentityInterface parent); } Base Implementation of interface: public abstract class MyIdentityBaseClass implements IMyIdentityInterface { private String _id; private IMyIdentityInterface _parent; public MyIdentityBaseClass () {} @Override public String getId() { return _id; } /** * If the id is null, then use the id of the parent component * appended with a lower-cased simple name of the current impl * class along with a counter suffix to enforce uniqueness */ @Override public void setId(String id) { if (id == null) { IMyIdentityInterface parent = getParent(); if (parent == null) { // this may be the top level component or it may be that // the user called setId() before setParent(..) } else { _id = Helpers.makeIdFromParent(parent,getClass()); } } else { _id = id; } } @Override public IMyIdentityInterface getParent() { return _parent; } @Override public void setParent(IMyIdentityInterface parent) { _parent = parent; } } Every component in the framework will have a parent except for the top level component. Using the setter type of injection, then the setters will have different behavior based on the order of the calling of the setters. In this case, would you agree, that a constructor taking a reference to the parent is better and dropping the parent setter method from the interface entirely? Is it considered bad practice if I wish to be able to configure these components using an IoC container? Chris

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• Java consistent synchronization

  - by ring0

  We are facing the following problem in a Spring service, in a multi-threaded environment: three lists are freely and independently accessed for Read once in a while (every 5 minutes), they are all updated to new values. There are some dependencies between the lists, making that, for instance, the third one should not be read while the second one is being updated and the first one already has new values ; that would break the three lists consistency. My initial idea is to make a container object having the three lists as properties. Then the synchronization would be first on that object, then one by one on each of the three lists. Some code is worth a thousands words... so here is a draft private class Sync { final List<Something> a = Collections.synchronizedList(new ArrayList<Something>()); final List<Something> b = Collections.synchronizedList(new ArrayList<Something>()); final List<Something> c = Collections.synchronizedList(new ArrayList<Something>()); } private Sync _sync = new Sync(); ... void updateRunOnceEveryFiveMinutes() { final List<Something> newa = new ArrayList<Something>(); final List<Something> newb = new ArrayList<Something>(); final List<Something> newc = new ArrayList<Something>(); ...building newa, newb and newc... synchronized(_sync) { synchronized(_sync.a) { _synch.a.clear(); _synch.a.addAll(newa); } synchronized(_sync.b) { ...same with newb... } synchronized(_sync.c) { ...same with newc... } } // Next is accessed by clients public List<Something> getListA() { return _sync.a; } public List<Something> getListB() { ...same with b... } public List<Something> getListC() { ...same with c... } The question would be, is this draft safe (no deadlock, data consistency)? would you have a better implementation suggestion for that specific problem? update Changed the order of _sync synchronization and newa... building. Thanks

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• Securing Web Service communication with SSL using CXF

  - by reef

  Hi all, I am trying to secure communications via SSL/TLS for one of our Web Service using CXF 2.2.5. I am wondering how to update client and server Spring configuration file to activate this feature. I found some information on CXF's website (CXF Wiki) for the client configuration, here is the given example: <http:conduit name="{http://apache.org/hello_world}HelloWorld.http-conduit"> <http:tlsClientParameters> <sec:keyManagers keyPassword="password"> <sec:keyStore type="JKS" password="password" file="src/test/java/org/apache/cxf/systest/http/resources/Morpit.jks"/> </sec:keyManagers> <sec:trustManagers> <sec:keyStore type="JKS" password="password" file="src/test/java/org/apache/cxf/systest/http/resources/Truststore.jks"/> </sec:trustManagers> <sec:cipherSuitesFilter> <!-- these filters ensure that a ciphersuite with export-suitable or null encryption is used, but exclude anonymous Diffie-Hellman key change as this is vulnerable to man-in-the-middle attacks --> <sec:include>.*_EXPORT_.*</sec:include> <sec:include>.*_EXPORT1024_.*</sec:include> <sec:include>.*_WITH_DES_.*</sec:include> <sec:include>.*_WITH_NULL_.*</sec:include> <sec:exclude>.*_DH_anon_.*</sec:exclude> </sec:cipherSuitesFilter> </http:tlsClientParameters> <http:authorization> <sec:UserName>Betty</sec:UserName> <sec:Password>password</sec:Password> </http:authorization> <http:client AutoRedirect="true" Connection="Keep-Alive"/> </http:conduit> Concerning this configuration, the Concerning the server side configuration I am unable to launch the server properly, here is the configuration I have: <http:destination name="{urn:ihe:iti:xds-b:2007}DocumentRepository_Port_Soap12.http-destination"> </http:destination> <httpj:engine-factory> <httpj:engine port="9043"> <httpj:tlsServerParameters> <sec:keyManagers keyPassword="changeit"> <sec:keyStore type="JKS" password="changeit" file="security/keystore.jks" /> </sec:keyManagers> <sec:trustManagers> <sec:keyStore type="JKS" password="changeit" file="security/cacerts.jks" /> </sec:trustManagers> <sec:cipherSuitesFilter> <!-- these filters ensure that a ciphersuite with export-suitable or null encryption is used, but exclude anonymous Diffie-Hellman key change as this is vulnerable to man-in-the-middle attacks --> <sec:include>.*_EXPORT_.*</sec:include> <sec:include>.*_EXPORT1024_.*</sec:include> <sec:include>.*_WITH_DES_.*</sec:include> <sec:include>.*_WITH_NULL_.*</sec:include> <sec:exclude>.*_DH_anon_.*</sec:exclude> </sec:cipherSuitesFilter> <sec:clientAuthentication want="true" required="true" /> </httpj:tlsServerParameters> </httpj:engine> </httpj:engine-factory> But when I run my application server (JOnas) with this configuration I have the following error message: Line 20 in XML document from ServletContext resource [/WEB-INF/beans.xml] is invalid; nested exception is org.xml.sax.SAXParseException: cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'httpj:engine-factory'. Do you guys know how to solve this issue? Thanks in advance,

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• Dependency Injection: Jetty 7

  - by Malax

  Hi StackOverflow! My application requires several interface implementations which require a Jetty server to do their job. This is, however, not necessarily the case in every implementations of those interfaces so the Jetty server is only a dependency. Since it would be a huge amount of pain to wrap the entire jetty server with all its logging, connector and Handler configurations, I want to inject the server to those implementations with Spring. I decided that injecting the Server class is not a good idea because an implementation could stop the server even if its required at another location. Currently I inject empty HandlerList classes to those implementations and they register their handlers to avoid those problems. The Problem: Those handlers might interfere with other handlers for example: implementation one might register a handler for /foo and implementation two too... problem. Has anyone used Jetty in such an environment? And how could this problem be solved? My XML to clarify my problem: <bean id="jetty" class="org.eclipse.jetty.server.Server" destroy-method="stop"> <property name="connectors"> <list> <bean class="org.eclipse.jetty.server.bio.SocketConnector"> <property name="host" value="10.8.0.46" /> <property name="port" value="9999" /> </bean> </list> </property> <property name="handler"> <bean class="org.eclipse.jetty.server.handler.HandlerCollection"> <property name="handlers"> <list> <ref bean="jetty.handlerList" /> <bean class="org.eclipse.jetty.server.handler.RequestLogHandler"> <property name="requestLog"> <bean class="org.eclipse.jetty.server.NCSARequestLog"> <constructor-arg value="${jetty.logfile}" /> <property name="extended" value="false"/> </bean> </property> </bean> </list> </property> </bean> </property> <property name="sendServerVersion" value="false" /> </bean> <bean id="jetty.handlerList" class="org.eclipse.jetty.server.handler.HandlerList" /> If I require an empty HandlerList I use something like this where com.example.myapp.util.ioc.CreateHandlerListFactory is a org.springframework.beans.factory.FactoryBean which creates a new HandlerList within the given HandlerList. <constructor-arg> <bean class="com.example.myapp.util.ioc.CreateHandlerListFactory"> <constructor-arg ref="jetty.handlerList"/> </bean> </constructor-arg>

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