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  • Message Queue with 'Message Barrier' Feature?

    - by Lajos Nagy
    Is there a message queue implementation that allows breaking up work into 'batches' by inserting 'message barriers' into the message stream? Let me clarify. No messages after a message barrier should be delivered to any consumers of the queue, until all messages before the barrier are consumed. Sort of like a synchronization point. I'd also prefer if all consumers received notification when they reached a barrier. Anything like this out there?

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  • Limit Connections with semaphores

    - by Robert
    I'm trying to limit the number of connections my server will accept using semaphores, but when running, my code doesn't seem to make this restriction - am I using the semaphore correctly? eg. I have hardcoded the number of permit as 2, but I can connect an unlimited number of clients... public class EServer implements Runnable { private ServerSocket serverSocket; private int numberofConnections = 0; private Semaphore sem = new Semaphore(2); private volatile boolean keepProcessing = true; public EServer(int port) throws IOException { serverSocket = new ServerSocket(port); } @Override public void run() { while (keepProcessing) { try { sem.acquire(); Socket socket = serverSocket.accept(); process(socket, getNextConnectionNumber()); } catch (Exception e) { } finally { sem.release(); } } closeIgnoringException(serverSocket); } private synchronized int getNextConnectionNumber() { return ++numberofConnections; } // processing related methods }

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  • How can I interrupt a ServerSocket accept() method?

    - by lukeo05
    Hi, In my main thread I have a while(listening) loop which calls accept() on my ServerSocket object, then starts a new client thread and adds it to a Collection when a new client is accepted. I also have an Admin thread which I want to use to issue commands, like 'exit', which will cause all the client threads to be shut down, shut itself down, and shut down the main thread, by turning listening to false. However, the accept() call in the while(listening) loop blocks, and there doesn't seem to be any way to interrupt it, so the while condition cannot be checked again and the program cannot exit! Is there a better way to do this? Or some way to interrupt the blocking method? Thanks!

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  • Get name of currently executing test in JUnit 4

    - by Dave Ray
    In JUnit 3, I could get the name of the currently running test like this: public class MyTest extends TestCase { public void testSomething() { System.out.println("Current test is " + getName()); ... } } which would print "Current test is testSomething". Is there any out-of-the-box or simple way to do this in JUnit 4? Background: Obviously, I don't want to just print the name of the test. I want to load test-specific data that is stored in a resource with the same name as the test. You know, convention over configuration and all that. Thanks!

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  • Custom Key Bindings in SWT

    - by Dimitar
    Hey all, Is it at all possible to add custom key bindings to buttons in SWT? I can't use & in the text of the button to set a mnenomic because my buttons have no text (only an image). Is there a good way to do this using key listeners or is there something like the input/action map in swing? Thanks in advance.

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  • Why is the setContextClassLoader() method placed on Thread ?

    - by Roman
    Why is the setContextClassLoader() method placed on thread ? What different thread have different classloaders? The question is what if i extended a classloader , loaded there some new classes. to the my custom classloader. Now , I want it to be the context classloader , so I call the method (Thread.currentThread().setContextClassLoader(loader)). Are these new classes awailable only in the context of the current Thread ? ( or how does it work ?) Thanks

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  • How to define function in a string in Android?

    - by androidNoob
    I have an event handler that I want to be connected to a button through xml. Basically, I want to define it as a string in my xml file, then use the property inspector to select the name of the handler for my button (the "on Click" property). How do I define a call to the function in the string?

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  • Getting custom attribute from an Exception thrown during testing

    - by Amit Bhargava
    I'm using JUnit4 to test my code. Now, I'm aware that the following annotation allows me to expect an exception of a certain type @Test(expected = NipException.class) However, I have an 'errorCode' property in my exception class which I would also like to verify. This is because the same exception is thrown at three places in the same method with different error codes. How do I access 'errorCode' of the thrown exception?

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  • Is it possible to overwrite a static method in parent class?

    - by MartinDenny2069
    I have a static method defined in a base class, I want to overwrite this method in its child class, is it possible? I tried this but it did not work as I expected. When I created an instance of class B and invoke its callMe() method, the static foo() method in class A is invoked. public abstract class A { public static void foo() { System.out.println("I am base class"); } public void callMe() { foo(); } } Public class B { public static void foo() { System.out.println("I am child class"); } }

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  • Using Session Bean provided data on JSF welcome page

    - by takachgeza
    I use JSF managed beans calling EJB methods that are provide data from database. I want to use some data already on the welcome page of the application. What is the best solution for it? EJBs are injected into JSF managed beans and it looks like the injection is done after executing the constructor. So I am not able to call EJB methods in the constructor. The normal place for EJB call is in the JSF action methods but how to call such a method prior to loding the first page of the application? A possible solution would be to call the EJB method conditionally in a getter that is used on the welcome page, for example: public List getProductList(){ if (this.productList == null) this.productList = myEJB.getProductList(); return this.productList; } Is there any better solution? For example, in some config file?

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  • how to show integer values in JComboBox?

    - by Edan
    Hello, I would like to know how to set a JComboBox that contain integers values that I could save. Here is the definitions of values: public class Item { private String itemDesc; private int itemType; public static int ENTREE=0; public static int MAIN_MEAL=1; public static int DESSERT=2; public static int DRINK=3; private float price; int[] itemTypeArray = { ENTREE, MAIN_MEAL, DESSERT, DRINK }; Object[][] data = {{itemDesc, new Integer(itemType), new Float(price)}}; . . . } Now, I want the add a JComboBox that the user will choose 1 of the items (ENTREE, MAIN_MEAL...) and then I could set the number as an Integer. I know that JComboBox need to be something like that: JComboBox combo = new JComboBox(itemTypeArray.values()); JOptionPane.showMessageDialog( null, combo,"Please Enter Item Type", `JOptionPane.QUESTION_MESSAGE);` What am I doing wrong?

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  • Classloading order in JBoss

    - by Spiderman
    I'd like to know if the default behavior of JBoss server (4.2.3.GA in my case) is loading the classes in parent-first or parent-last mode. And in case it work as I suspect in parent-last mode (i.e. first trying to load classes from the application's WEB-INF/lib and only if they are not found go to server\lib), how can I configure it to work in the opposite- first trying to load classes from outside and only looking inside the application afterwards.

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  • Incremental build with NetBeans and Maven for jetty hot deployment

    - by deamon
    After my unsuccessful attempt to run Tomcat with hot deployment from NetBeans with Maven, I've tried jetty. The jetty-maven-plugin doc gave me an important hint: The plugin will automatically ensure the classes are rebuilt and up-to-date before deployment. If you change the source of a class and your IDE automatically compiles it in the background, the plug-in will pick up the changed class. If I look at $myproject/target/classes/... in the projects directory, I can see that NetBeans doesn't compile and refresh the class file on saving. I need to build the project explicitly to update the file and than jetty picks up the change. (The plug-in param "scanIntervalSeconds" is set to 1.) How can I tell NetBeans to compile on save and update the class file so that jetty can pick up the change?

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  • Best way to access database from android

    - by Brandon Delany
    I am working on a Android app and I have a dilemma. I have a list of Objects. I have to update each of these objects with a database. I have 2 methods: Method 1: I can loop through the Objects. For each object I can connect to the server, update it, and then move on to the next Object, and so forth. Method 2: I can store the Objects in a list, send the whole list to the server, update it on the server side, then return a list of updated objects. My questions are: Which method is faster? Which method is easier on the phone's battery? By the way, Method 1 is easier for me to code :). Thank you.

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  • Upgrading RAD JDK Version to 1.6

    - by Deena
    Hi, I am using RAD for development. For my application i need to upgrade my JDK compliance to 1.6 from 1.4. I have installed jdk 1.6 and added it to my installed JRE's. Now in the JDK compliance still 1.4 is shown, what should be done to set the JDK compliance to 1.6? Thanks in advance. Cheers, Deena

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  • JPanel on top of JLabel

    - by newbie
    Good day! Is it possible to add a JPanel on top of a JLabel? I would like my JFrame to have a background image and in order to this, i used this code (based from past stackoverflow answers): setLocation(150,50); setSize(700,650); setVisible(true); JLabel contentPane = new JLabel(); contentPane.setIcon(new ImageIcon("pics/b1.jpg")); contentPane.setLayout( new BorderLayout()); setContentPane( contentPane ); Now my problem is, I cannot put a panel on my JFrame because of the JLabel background. Please help. Thanks.

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  • Spring ROO issue with UrlRewrite in STS (eclipse)

    - by user224270
    I'm having trouble figuring out how to solve this issue. I have a file called: "urlrewrite.xml" which was automatically generated by spring ROO after running the "controller" command in ROO Shell. However, I still get the following error: "Referenced file contains errors (http://tuckey.org/res/dtds/urlrewrite3.0.dtd). For more information, right click on the message in the Problems View and select "Show Details..." Here's the content of the urlrewrite.xml file: <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE urlrewrite PUBLIC "-//tuckey.org//DTD UrlRewrite 3.0//EN" "http://tuckey.org/res/dtds/urlrewrite3.0.dtd"> <urlrewrite default-match-type="wildcard"> <rule> <from>/resources/**</from> <to last="true">/resources/$1</to> </rule> <rule> <from>/static/WEB-INF/**</from> <set type="status">403</set> <to last="true">/static/WEB-INF/$1</to> </rule> <rule> <from>/static/**</from> <to last="true">/$1</to> </rule> <rule> <from>/</from> <to last="true">/app/index</to> </rule> <rule> <from>/app/**</from> <to last="true">/app/$1</to> </rule> <rule> <from>/**</from> <to>/app/$1</to> </rule> <outbound-rule> <from>/app/**</from> <to>/$1</to> </outbound-rule> </urlrewrite> Any thoughts on how to get rid of this error?

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  • What are some techniques to create scrollable areas?

    - by Omega
    I'm getting started with OpenGL ES on Android and I'd looking to learn some techniques to have a game map larger than the visible area. I'm assuming I've somehow got to ensure that the system isn't rendering the entire scene, including what's outside of the visible area. I'm just not sure how I'd go about designing this! This is for simple 2D top-down tile based rendering. No real 3D except what's inherent in OpenGL ES itself. Would anyone be able to get me started on the right path? Are there options that might scale nicely when I decide to start tilting my perspective and doing 3D?

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  • Spring MVC; avoiding file extension in url?

    - by Ezombort
    I just started with Spring Web MVC. I'm trying to avoid file extenstions in the url. How can i do this? (I'm using Spring 2.5.x) Bean: <bean name="/hello.htm" class="springapp.web.HelloController"/> I want it to be: <bean name="/hello" class="springapp.web.HelloController"/> I cannot get it to work. Any ideas? Edit: Url-mapping <servlet-mapping> <servlet-name>springapp</servlet-name> <url-pattern>*.htm</url-pattern> </servlet-mapping> I have tried changing the url-pattern with no luck (* and /*).

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  • Why is JFormattedTextField evil?

    - by kwutchak
    Hi, In this question Is there any way to accept only numeric values in a JTextField? one of the answers suggested that JFormattedTextField had issues. I've not yet used it, but could somebody please expand (or disagree) on the issues with this class? Thanks...

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  • How to remove Modules from a Intellij Maven Project permanently?

    - by herpnderpn
    I am currently working on a larger scale Maven-based project in IntelliJIdea 12.1.6 Ultimate. I have been working with IntelliJIdea since about 5 months. An included module has dependencies on another module. The dependent module's source was also part of my project until recently. Since I removed the dependent module from my project, I get compile errors whenever I am trying to compile the source without maven. The pom.xml of removed modules in Intellij seem to be placed onto the Settings-Maven-Ignored Files. I cant seem to remove it from there, only check or uncheck it. It's not possible to include the module again since IntelliJ will say its still under Ignored Files. 2 ways allow me to compile again: Uncheck the pom from Ignored files, which will include the module again in my project. Or delete the source of the dependent project, so my project will load the dependent module from the maven repository. But whenever I update my project from svn, the source of the dependent module is restored (I don't know why this even happens since its not part my project) and the cycle begins anew. I googled this for a while since it gets really annoying. It became a problem with several excluded modules. I could rebuild the intellij-project but since a lot of IntelliJ settings were made (not related to the problem) I would rather solve this. Any help is appreciated, I guess I must be missing something

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