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• design a large scale network for an organization

  - by Essam

  hello.i am so new to networking i want to design a large scale network for an organization with HQ and two branches. i want to use class A address for that.my questions are: if i am using the network address 30.0.0.0 for the whole organization how can it be different from another organization company or whatever which is using the same address in another country? now i have the three locations for this organization,so i need 5 subnets [one for the HQ,two for branch A and branch B , one for connecting A to HQ and one for connecting branch B with HQ since i will use central DHCP server at the HQ,is that(number of subnetting) right? is it advisable to use class A or class B for this organization it term of address that will be wasted (lets say it is a university with two branches in two different states)?! that is all your help is highly appropriated.

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• Interface naming in Java

  - by Allain Lalonde

  Most OO languages prefix their interface names with a capital I, why does Java not do this? What was the rationale for not following this convention? To demonstrate what I mean, if I wanted to have a User interface and a User implementation I'd have two choices in Java: Class = User, Interface = UserInterface Class = UserImpl, Interface = User Where in most languages: Class = User, Interface = IUser Now, you might argue that you could always pick a most descriptive name for the user implementation and the problem goes away, but Java's pushing a POJO approach to things and most IOC containers use DynamicProxies extensively. These two things together mean that you'll have lots of interfaces with a single POJO implementation. So, I guess my question boils down to: "Is it worth following the broader Interface naming convention especially in light of where Java Frameworks seem to be heading?"

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• Question about member function pointers in a heirarchy

  - by Jesse Beder

  I'm using a library that defines an interface: template<class desttype> void connect(desttype* pclass, void (desttype::*pmemfun)()); and I have a small heirarchy class base { void foo(); }; class derived: public base { ... }; In a member function of derived, I want to call connect(this, &derived::foo); but it seems that &derived::foo is actually a member function pointer of base; gcc spits out error: no matching function for call to ‘connect(derived* const&, void (base::* const&)())’ I can get around this by explicitly casting this to base *; but why can't the compiler match the call with desttype = base (since derived * can be implicitly cast to base *)? Also, why is &derived::foo not a member function pointer of derived?

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• Invoke private method with interface as argument

  - by Stephanie

  Hi, I've been attempting to invoke a private method whose argument is a parameter and I can't quite seem to get it right. Here's kind of how the code looks so far: public class TestClass { public TestClass(){ } private void simpleMethod( Map<String, Integer> testMap) { //code logic } } Then I attempt to use this to invoke the private method: //Hashmap Map <String, Integer> testMap = new HashMap <String, Integer>(); //method I want to invoke Method simpleMethod = TestClass.class.getDeclaredMethod("simpleMethod", Map.class); simpleMethod.setAccessible(true); simpleMethod.invoke(testClassObject, testMap); //Throws an IllegalArgumentException As you can see, it throws an IllegalArgumentException. I've attempted to cast the hashmap back to a map, but that didn't work. What am I doing wrong?

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• How to use reflection to get a default constructor?

  - by Qwertie

  I am writing a library that generates derived classes of abstract classes dynamically at runtime. The constructor of the derived class needs a MethodInfo of the base class constructor so that it can invoke it. However, for some reason Type.GetConstructor() returns null. For example: abstract class Test { public abstract void F(); } public static void Main(string[] args) { ConstructorInfo constructor = typeof(Test).GetConstructor( BindingFlags.NonPublic | BindingFlags.Public, null, System.Type.EmptyTypes, null); // returns null! } Note that GetConstructor returns null even if I explicitly declare a constructor in Test, and even if Test is not abstract.

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• Problem deploying GWT application on apache and tomcat using mod_jk

  - by Colin

  I'm trying to deploy a GWT app on Apache using mod_jk connector. I have compiled the application and tested it on tomcat on the address localhost:8080/loginapp and it works ok. However when I deploy it to apache using mod_jk I get the starter page which gives me a login form but trying to login I get this error 404 Not Found Not Found The requested URL /loginapp/loginapp/login was not found on this server Looking at the apache log files i see this [Thu Jan 13 13:43:17 2011] [error] [client 127.0.0.1] client denied by server configuration: /usr/local/tomcat/webapps/loginapp/WEB-INF/ [Thu Jan 13 13:43:26 2011] [error] [client 127.0.0.1] File does not exist: /usr/local/tomcat/webapps/loginapp/loginapp/login, referer: http://localhost/loginapp/LoginApp.html The mod_jk configurations on my apache2.conf file are as follows LoadModule jk_module /usr/lib/apache2/modules/mod_jk.so JkWorkersFile /etc/apache2/workers.properties JkLogFile /var/log/apache2/mod_jk.log JkLogLevel info JkLogStampFormat "[%a %b %d %H:%M:%S %Y] " JkOptions +ForwardKeySize +ForwardURICompat -ForwardDirectories JkRequestLogFormat "%w %V %T" <IfModule mod_jk.c> Alias /loginapp "/usr/local/tomcat/webapps/loginapp/" <Directory "/usr/local/tomcat/webapps/loginapp/"> Options Indexes +FollowSymLinks AllowOverride None Allow from all </Directory> <Location /*/WEB-INF/*> AllowOverride None deny from all </Location> JkMount /loginapp/*.html loginapp My workers.properties file is as follows workers.tomcat_home=/usr/local/tomcat workers.java_home=/usr/lib/jvm/java-6-sun ps=/ worker.list=loginapp worker.loginapp.type=ajp13 worker.loginapp.host=localhost worker.loginapp.port=8009 worker.loginapp.cachesize=10 worker.loginapp.cache_timeout=600 worker.loginapp.socket_keepalive=1 worker.loginapp.recycle_timeout=300 worker.loginapp.lbfactor=1 And this is my servlet mappings for my app on the application's web.xml <servlet> <servlet-name>loginServlet</servlet-name> <servlet-class>com.example.loginapp.server.LoginServiceImpl</servlet-class> </servlet> <servlet-mapping> <servlet-name>loginServlet</servlet-name> <url-pattern>/loginapp/login</url-pattern> </servlet-mapping> <servlet> <servlet-name>myAppServlet</servlet-name> <servlet-class>com.example.loginapp.server.MyAppServiceImpl</servlet-class> </servlet> <servlet-mapping> <servlet-name>myAppServlet</servlet-name> <url-pattern>/loginapp/mapdata</url-pattern> </servlet-mapping> Ive tried everything and it seems to still elude me. Even tried changing the deny from all directive on the WEBINF folder to allow from all and still it doesnt work. Maybe im missing something. Any help will be highly appreciated.

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• How to override the behavior of Spring @Autowired

  - by Mark

  Hi a little background: I am Using Spring 2.5, and specifically spring IOC and annotations. I am using @Autowired in my code (the Autowiring is done by type) and use @Component for exposing Classes to the Automatic wiring. The situation described bellow arose while i tried to test my code. now to the problem: Note: i use a different Spring Context for the Test environment. I have a class FOO which is @Autowired but in the test context i want to use a different class of the same type MockFoo (extends FOO) The Spring Setup of course fails do so automatically due to multiple options for the Dependency Injection of the FOO class (both FOO and MockFOO comply to the Type check) I am looking for a way to inject the test bean instead of the original bean. I expected Spring to allow using the Context configurion file to override a bean injection or to order Spring not to autowire a specific bean BUT All these option seem to exists only for the beans which were originally defined in the Spring Context Configuration file

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• Why is the base() constructor not necessary?

  - by Earlz

  Hello, I have a class structure like abstract class Animal { public Animal(){ //init stuff.. } } class Cat : Animal { public Cat(bool is_keyboard) : base() //NOTE here { //other init stuff } } Now then, look at the noted line. If you remove : base() then it will compile without an error. Why is this? Is there a way to disable this behavior? I have had multiple bugs now from forgetting the base() which I would have thought to be required on such a special thing as a constructor.

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• Grails searchable plugin

  - by Don

  Hi, In my Grails app, I'm using the Searchable plugin for searching/indexing. I want to write a Compass/Lucene query that involves multiple domain classes. Within that query when I want to refer to the id of a class, I can't simply use 'id' because all classes have an 'id' property. Currently, I work around this problem by adding the following property to a class Foo public Long getFooId() { return id } static transients = ['fooId'] Then when I want to refer to the id of Foo within a query I use 'fooId'. Is there a way I can provide an alias for a property in the searchable mapping rather than adding a property to the class?

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• Display value of a django form field in a template?

  - by Eran Kampf

  I have a form with an email property. When using {{ form.email }} in case of some validation error, django still renders the previous value in the input tag's value attribute: <input type="text" id="id_email" maxlength="75" class="required" value="[email protected]" name="email"> I want to render the input tag myself (to add some javascript code and an error class in case of an error). For example this is my template instead of {{ form.email }}: <input type="text" autocomplete="on" id="id_email" name="email" class="email {% if form.email.errors %}error{% endif %}"> However this does not display the errorneous value ("[email protected]" in this example) to the user. How do I get the field's value in the template?

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• Watir::IE.attach(:title,/x/) not working correctly on Win 7 IE8

  - by Zachary Hayes

  System: Window 7 Internet Explorer 8 Ruby 1.8 Watir 1.6.5 If I manually open a browser window and then visit a site that causes a second browser window to open and then use the Watir::IE.attach method to find the second browser window everything work fine. The problem is when I open the first Internet Explorer window with the command Watir::IE.new and then visit a site that causes a second browser window to open. When I use Watir::IE.attach to find the second browser window I now get: Watir::Exception::NoMatchingWindowFoundException: Unable to location a window with title of (?-mix:x) from /ie-class.rb:297:in 'attach_browser_window' from /ie-class.rb:149:in '_attach_init' from /ie-class.rb:143:in 'attach' from (irb):15 Has anyone run into this problem and developed a solution?

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• Generic type in generic collection

  - by Brian Triplett

  I have generic type that looks like: public class GenericClass<T, U> where T : IComparable<T> { // Class definition here } I then have a collection of these instances. What is the cleanest way to pass through the type constraints? public class GenericCollection<V> where V : GenericClass<T, U> // This won't compile { private GenericClass<T, U>[] entries; public V this[index] { get{ return this.entries[index]; } } } Is there perhaps a better way to design this? I think that specifying GenericCollection<T, U, V> where V : GenericClass<T, U> seems awkward. Might be my only option though....

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• forward declare static function c++

  - by Matthew Scouten

  I want to forward declare a static member function of a class in another file. What I WANT to do looks like this: BigMassiveHeader.h: class foo { static void init_foos(); } Main.cpp: class foo; void init_foos(); int main(char** argv, int argc) { foo::init_foos() } This fails out with "error C2027: use of undefined type 'tt_py_ns::foo'" Is there a way to accomplish what I want to do with out making init_foos a free function, or including BigMassiveHeader.h? (BigMassiveHeader.h is noticeably effecting compile time, and is included everywhere.)

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• How to inject dependencies into a custom UserNamePasswordValidator in WCF?

  - by Dannerbo

  I'm using a UserNamePasswordValidator in WCF along with Unity for my dependency injection, but since WCF creates the instance of the UserNamePasswordValidator, I cannot inject my container into the class. So how would one go about this? The simplest solution I can think of is to create a static proxy/wrapper class around a static instance of a UnityContainer, which exposes all the same methods... This way, any class can access the container, and I don't need to inject it everywhere. So I could just do UnityContainerWrapper.Resolve() anywhere in code. So basically this solution solves 2 problems for me, I can use it in classes that I'm not creating an instance of, and I can use it anywhere without having to inject the container into a bunch of classes. The only downside I can think of is that I'm now potentially exposing my container to a bunch of classes that wouldn't of had access to the container before. Not really sure if this is even a problem though?

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• Good programming style when handling multiple objects

  - by Glitch

  I've been programming a software version of a board game. Thus far I have written the classes which will correspond to physical objects on the game board. I'm well into writing the program logic, however I've found that many of the logic classes require access to the same objects. At first I was passing the appropriate objects to methods as they were called, but this was getting very tedious, particularly when the methods required many objects to perform their tasks. To solve this, I created a class which initialises and stores all the objects I need. This allows me to access an object from any class by calling Assets.dice(), for example. But now that I've thought about it, this doesn't seem right. This is why I'm here, I fear that I've created some sort of god class. Is this fear unfounded, or have I created a recipe for disaster?

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• JavaFX Threading issue - GUI freezing while method call ran.

  - by David Meadows

  Hi everyone, I hoped someone might be able to help as I'm a little stumped. I have a javafx class which runs a user interface, which includes a button to read some text out loud. When you press it, it invokes a Java object which uses the FreeTTS java speech synth to read out loud a String, which all works fine. The problem is, when the speech is being read out, the program stops completely until its completed. I'm not an expert on threaded applications, but I understand that usually if I extend the Thread class, and provided my implementation of the speech synth code inside an overridden run method, when I call start on the class it "should" create a new Thread, and run this code there, allowing the main thread which has the JavaFX GUI on to continue as normal. Any idea why this isn't the case? Thanks a lot in advance!

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• JAXB - representing an element as a boolean member?

  - by Marcus

  We have this XML: <Summary> <ValueA>xxx</ValueA> <ValueB/> </Summary> <ValueB/> will never have any attributes or inner elements. It's a boolean type element - it exists (true) or it doesn't (false). JAXB generated a Summary class with a String valueA member, which is good. But for ValueB, JAXB generated a ValueB inner class and a corresponding member: @XmlElement(name = "ValueB") protected Summary.ValueB valueB; But what I'd like is a boolean member and no inner class: @XmlElement(name = "ValueB") protected boolean valueB; How can you do this? I'm not looking to regenerate the classes, I'd like to just make the code change manually.

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• Custom Classes Passed from Service to a UI threads via AIDL

  - by Honza Pokorny

  I have a service that regularly queries a web server for new messages. The service stores the new messages in an arrayList. These messages are implemented using a custom class, storing all kinds of metadata (strings and longs). An activity then connects to this service to retrieve those messages and display them to the user. I have an .aidl file that describes the interface that the service exposes. package com.example.package; interface MyInterface { List<Message> getMessages(); } The Message class extends the Parcelable class which should allow for the IPC transfer. The problem is this: Eclipse gives me an error saying that the type of List<Message> is unknown. Any imports are marked as invalid. Ideas? Thanks

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• ASP.NET MVC UpdateModel - fields vs properties??

  - by mrjoltcola

  I refactored some common properties into a base class and immediately my model updates started failing. UpdateModel() and TryUpdateModel() did not seem to update inherited public properties. I cannot find detailed info on MSDN nor Google as to the rules or semantics of these methods. The docs are terse (http://msdn.microsoft.com/en-us/library/dd470933.aspx), simply stating: Updates the specified model instance using values from the controller's current value provider. SOLVED: MVC.NET does indeed handle inherited properties just fine. This turned out to have nothing to do with inheritance. My base class was implemented with public fields, not properties. Switching them to formal properties (adding {get; set; }) was all I needed. This has bitten me before, I keep wanting to use simple, public fields. I would argue that fields and properties are syntactically identical, and could be argued to be semantically equivalent, for the user of the class.

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• Undefined Variable in Matlab

  - by OrangeRind

  The Following is the basic skeleton for my MATLAB program. Each box is a class definition. Scroll down for the error. Note: Each Class has a custom constructor which does not require an external parameter The Error Undefined function or variable 'Troom'. Error in == wallwall.wall at 31 function o = wall(Tr) Error in == mainfile at 5 w1 = wall(); This comes when I create an object of Class wall from another file "mainfile" Question Why is this happening? Am I getting wrong in the concepts of OOP for Matlab specific? How do I resolve this? Thanks in Advance!

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• how can I implement Comparable more than once?

  - by codeman73

  I'm upgrading some code to Java 5 and am clearly not understanding something with Generics. I have other classes which implement Comparable once, which I've been able to implement. But now I've got a class which, due to inheritance, ends up trying to implement Comparable for 2 types. Here's my situation: I've got the following classes/interfaces: interface Foo extends Comparable<Foo> interface Bar extends Comparable<Bar> abstract class BarDescription implements Bar class FooBar extends BarDescription implements Foo With this, I get the error 'interface Comparable cannot be implemented more than once with different arguments...' Why can't I have a compareTo(Foo foo) implemented in FooBar, and also a compareTo(Bar) implemented in BarDescription? Isn't this simply method overloading?

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• How to query a date in HQL (Hibernate) with Joda Time?

  - by fabien7474

  I am sure that someone familiar with HQL (I am myself a newbie) can easily answer this question. In my Grails application, I have the following domain class. class Book { org.joda.time.DateTime releaseDate //I use the PersistentDateTime for persisting via Hibernate (that use a DATETIME type for MySQL DB) } In my HQL query, I want to retrieve books whose release date is included in range date1..date2 For instance I tried: DateTime date1, date2 ... def queryStr = "select * from Book as b where b.releaseDate > $date1 and b.releaseDate < $date2" def res = Book.executeQuery(queryStr) But I got the exception ...caused by: org.springframework.orm.hibernate3.HibernateQueryException: unexpected token: The error token points to date format (for instance 2009-11-27T21:57:18.010+01:00 or Fri Nov 27 22:01:20 CET 2009) I have also tried to convert date1 into a Date class without success So what is the correct HQL code ? Should I convert to a specific format (which one?) using the patternForStyle method or is there another -cleaner- way to do it? Thanks, Fabien.

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• WMI query to check setting "Reversible Encryption" in Windows XP

  - by Mart

  In Windows XP, there are two settings in Group Policy I'm looking at: Password must meet complexity requirements Store password using reversible encryption Both of these settings are under Local Computer Policy/Computer Config/Windows Settings/Security Settings/Account Policies/Password Policy. For the first one, I have found the setting in RSOP_SecurityEventLogSettingBoolean class in WMI. However, I can't find the latter. Does anybody know in which class in WMI can I read that particular setting?

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• Jquery mouseover change background color problem

  - by Sergio

  Jquery code: $(".menu_clickable").mouseover(function() { $(this).css({'background-color' : '#F00'}).mouseout(function(){ $(this).css({'background-color' : '#FFF'}); }); }); $(".menu_clickable").live('click', function() { $(this).css({'background-color' : '#FCC'}); }); HTML source: <div class="menu_clickable prof_info2" id="prof_info" >first</div> <div class="menu_clickable prof_info3" id="prof_info" >second</div> <div class="menu_clickable prof_info3" id="prof_info" >third</div> I'm trying to make the hover efect using Jquery and it is working fine but if I want to change the DIV background color when it's clicked it's not working, actually the clicked DIV change background color but it is stay like that while the cursor is on it. If I move it out it will restore the original background color. Why?

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• Issue in exec method

  - by mukul sharma

  Hi all, I am a having two python files file1.py and file2.py. I am using exec() to get the method/Variables defined in the file2.py. file1.py have a class as given below class one: def init(self): self.HOOK = None exec(file2.py) self.HOOK = Generate ### call the hook method #### self.HOOK() file2.py looks like as (There is no class define in file2.py) def Generate() do 1 do 2 Hello() def hello() print "hello" Now the problem is as When i run script it is giving a error global name Hello not found. If i remove Hello() from Generate method in file2.py then its work fine. I cant use import file2.py in file1.py,because in file2.py the only one method name (Generate) is fix (its taken as requirement). So apart from Genarate method user can define any method and can call this in generate method, because this approach is not working so i have to write whole code into generate method only and code is also repetitive. Any help is really appreciable...

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