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  • apache tomcat 8 websocket origin and client address

    - by user2926082
    i hope someone can help me ... i am using apache tomcat 8.0.0-RC5 and JSR-356 web socket API ... I have 2 questions: 1) Is it possible to get the client ip on @OnOpen method ?? 2) Is it possible to get the origin of the connection ??? I followed the websocket example which comes with the distribution of tomcat and i was not able to find the answers .... My java class is basically as follow @ServerEndpoint(value = "/data.socket") public class MyWebSocket { @OnOpen public void onOpen(Session session) { // Here is where i need the origin and remote client address } @OnClose public void onClose() { // disconnection handling } @OnMessage public void onMessage(String message) { // message handling } @OnError public void onError(Session session, Throwable throwable) { // Error handling } }

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  • Monitoring Reasoning Progress using the Pellet Reasoner

    - by Nico
    I am currently constructing an OWL ontology, which - until very recently classified rapidly using the Pellet reasoner. However, since the introduction of several new classes, the reasoning performance has slowed to a crawl. Although the reasoner completes and the ontology does not contain any unsatisfiable concepts etc, the time the reasoning takes is unacceptable. I am currently trying to track down the offending classes/class that may have led to the slowdown. Here's my question: is it possible to log the reasoning progreess of Pellet? I.e. is it possible to produce some output that will document how long pellet has spent on certain reasoning tasks/traces how long reasoning over any given class and axiom takes? If so, does anyone have some java code they could post up? Thanks in advance for your answers!

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  • Template engine recommendations

    - by alex
    I'm looking for a template engine. Requirements: Runs on a JVM. Java is good; Jython, JRuby and the like, too... Can be used outside of servlets (unlike JSP) Is flexible wrt. to where the templates are stored (JSP and a lot of people require the templates to be stored in the FS). It should provide a template loading interface which one can implement or something like that Easy inclusion of parameterized templates- I really like JSP's tag fragments Good docs, nice code, etc., the usual suspects I've looked at JSP- it's nearly perfect except for the servlet and filesystem coupling, Stringtemplate- I love the template syntax, but it fails on the filesystem coupling, the documentation is lacking and template groups and stuff are confusing, GXP, TAL, etc. Ideas, thoughts? Alex

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  • XHTML editor wanted!

    - by stolsvik
    I need an editor that outputs clean HTML, and preferably strict XHTML with CSS, as I am going to display the resulting pages as help pages in a java application using xhmtlrenderer ("Flying Saucer") which apparently very much prefers XHTML with CSS 2.1. Having searched stackoverflow for HTML editor and XHTML editor, I've found several mentioned. Aptana is one, Eclipse's Web Tools is another, and KompoZer is a third. I am going to try these out. With this question, I ask whether there are other good options that would satisfy my requirements, and if there are any one of these mentioned or new ones that you'd recommend in particular, that I should focus a bit extra on?

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  • How created method with signature as List

    - by London
    Hi all, I'm very new to Java programming language so this is probably dumb question but I have to ask it because I can't figure it out on my own. Here is the deal. I want to create method which extracts certain object type from a list. So the method should receive List as argument, meaning list should contain either Object1 or Object2. I've tried like this : public Object1 extractObject(List<?>){ //some pseudo-code ... loop trough list and check if list item is instance of object one return that instance } The problem with declaring method with List<?> as method argument is that I receive compilation error from eclipse Syntax error on token ">", VariableDeclaratorId expected after this token. How do I set the method signature properly to accept object types either Object1 or Object2 ? Thank you

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  • multi-dimensional ArrayList

    - by wishi
    Hi! Just a very small question... I seem to run into too much complexity here: I have to realize an index-structure like {42, someString}. I tried: Object entry[][] = new Object[1][1]; ArrayList<Object> my_list = new ArrayList<Object>(); However that looks really strange. Isn't there a better much simpler solution to just store some Integer and a String? I need to perfrom search for the Strings and return the Integer... so I thought Collections and ArrayLists are good friends in the Java API.

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  • I have applied a check for not allowing alphabets.But its not working.....

    - by bhavna raghuvanshi
    import java.util.Scanner; public class Main extends Hashmap{ public static void main(String[] args) { Hashmap hm = new Hashmap(); int x=0; Scanner input = new Scanner(System.in); do{ System.out.print("Enter any integer value between 1 to 12: "); x = input.nextInt(); }while(x<=0 || x>12); Scanner sc = new Scanner(System.in); //int number; do { while (!sc.hasNextInt()) { System.out.println("That's not a number!"); sc.next(); } x = sc.nextInt(); }while(x>=0); String month = hm.getEntry(x); System.out.println(month); } } here I need to restrict user from entering an alphabet.But its not working. pls help...

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  • Facebook Open Graph without a browser

    - by Hellnar
    Hello, For a middleware system with internet (which works inside a set-top box) I want to develop a primitive Facebook interface where users can type their user-names and password, showing their latest notification, messages and other casual stuff on the TV screen by using the recent Facebook Graph API. This middleware program uses Java ME to run programs (such as this simple facebook app) and it can connect to internet however it doesn't have a real web browser. Without browser it can connect to any url to retrieve the JSON response however I am not sure how to achieve authentication without a real browser. Under this circumstances, is it possible Facebook authentication? If you think so, what approach would you suggest ? Thanks

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  • How can I create a new class instance from a class within a (static) class?

    - by Mervin
    I'm new to Java (have experience with C#), This is what i want to do: public final class MyClass { public class MyRelatedClass { ... } } public class OtherRandomClass { public void DoStuff() { MyRelatedClass data = new MyClass.MyRelatedClass(); } } which gives this error in Eclipse: "No enclosing instance of type BitmapEffects is accessible. Must qualify the allocation with an enclosing instance of type BitmapEffects (e.g. x.new A() where x is an instance of BitmapEffects)." this is possible in C# with static classes , how should it be done here?

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  • JNDI Issues: Jboss 4.2.2 Spring 2.5 and hibernate ejb

    - by jon077
    I have a strange problem, that is causing me some grief. If the following jar is in my classpath: <dependency> <groupId>org.hibernate</groupId> <artifactId>org.hibernate.ejb</artifactId> <version>3.3.2.GA</version> </dependency> My JNDI lookup for my datasource returns null. Here is the basic code I am using to do the lookup: InitialDirContext ctx = new InitialDirContext(env); DataSource dataSource = (DataSource)ctx.lookup("java:dataContent"); Otherwise, the DataSource returns fine from the context. Unfortunately, I need the jar in order to avoid ClassCastExceptions within Jboss 4.2.2. Any help is appreciated.

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  • Tuning JVM (GC) for high responsive server application

    - by elgcom
    I am running an application server on Linux 64bit with 8 core CPUs and 6 GB memory. The server must be highly responsive. After some inspection I found that the application running on the server creates rather a huge amount of short-lived objects, and has only about 200~400 MB long-lived objects(as long as there is no memory leak) After reading http://java.sun.com/javase/technologies/hotspot/gc/gc_tuning_6.html I use these JVM options -Xms2g -Xmx2g -XX:MaxPermSize=256m -XX:NewRatio=1 -XX:+UseConcMarkSweepGC Result: the minor GC takes 0.01 ~ 0.02 sec, the major GC takes 1 ~ 3 sec the minor GC happens constantly. How can I further improve or tune the JVM? larger heap size? but will it take more time for GC? larger NewSize and MaxNewSize (for young generation)? other collector? parallel GC? is it a good idea to let major GC take place more often? and how?

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  • JFrame.setBackground() not working -- why?

    - by devoured elysium
    JFrame mainFrame = new JFrame(); mainFrame.setSize(100, 100); mainFrame.setBackground(Color.CYAN); mainFrame.setVisible(true); My intent is to create a window with a cyan background. What is wrong with this? My window doesn't get cyan, as I'd expect! Also, could anyone point out why I seem to have all the colors in duplicate (there's a Color.CYAN and a Color.cyan). Is there any difference at all between the two? Maybe the older one was a constant from before there were enums in Java and the second one is from the Enum? Thanks

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  • Session-timeout configuration doesn't work?

    - by David
    In web.xml I have this <session-config> <session-timeout>2</session-timeout> </session-config> <listener> <listener-class>myapplication.SessionListener</listener-class> In the SessionListener.java I have public void sessionDestroyed (HttpSessionEvent event){ System.out.println("Visitor Removed!!"); } But it seems System.out.println("Visitor Removed!!") has never been executed. I am new to Tombat6 and JSp. Any suggestion please?

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  • What is the possible benefit (if any) of allowing recursive contructors?

    - by Penang
    In Java, constructors cannot be recursive. Compile time error: "recursive constructor invocation". Let's assume that we did not have this restriction. Things to keep in mind: The return type of a constructor is void. Since it is a void method you can't harness the complete power of recursion. A constructor can invoke itself (or any other constructor) using this(). But a "call to this must be first statement in constructor" We could use non local data between consecutive calls to still have some possible gain from recursive constructors. Would there be any benefit from allowing recursive constructors?

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  • How does NetBeans' Splash Screen feature work?

    - by Pam
    New to NetBeans and just noticed that in the File Project Properties Application dialog there is a text field labeled Splash Screen that allows you to specify a path to an image that you would like displayed when your program is launching. I want to customize the way my splash screen works (adding a progress bar, etc.) and would like to code it from the ground up but don't know where to start. What are the best practices for Java/Swing-based splash screens? Thanks for any and all input!

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  • parser the xml and build a ui for user

    - by hguser
    Hi: Now I have to handle some xml in my java swing application. I have to build a swing ui according to the special schema ,then user can fill some values.After user completed,I will collect the information,validate the value and then build a xml file. For building xml file I can use the xmlbeans,however how to parse the schema and build a swing ui? Since the schema is rather complex. A schema can be found here: example schema I have to parser this schema,for the LiteralInputType ,a JTextArea should be built. However there are other types "complexType" and etc.. These types may not occur at the sametime. Some times only the LiteralInputType is needed,somethimes the ComplexType is needed,also maybe all of them are needed. So, how to implement it? Anyone can help me?

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  • Output of System.out.println(object)

    - by Shaarad Dalvi
    I want to know what exactly the output tells when I do the following : class data { int a=5; } class main { public static void main(String[] args) { data dObj=new data(); System.out.println(dObj); } } I know it gives something related to object as the output in my case is data@1ae73783. I guess the '1ae73783' is a hex number. I also did some work around and printed System.out.println(dObj.hashCode()); I got number 415360643. I got an integer value. I don't know what hashCode() returns, still out of curiosity, when I converted 1ae73783 to decimal, I got 415360643! That's why I am curious that what exactly is this number?? Is this some memory location of Java's sandbox or some other thing? Any light on this matter will be helpful..thanks! :)

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  • tomcat multithreading problem

    - by jutky
    Hi all I'm writing a java application that runs in Tomcat, on a multi-core hardware. The application executes an algorithm and returns the answer to the user. The problem is that even when I run two requests simultaneously, the tomcat process uses at most one CPU core. As far as I understand each request in Tomcat is executed in separate thread, and JVM should run each thread on separate CPU core. What could be the problem that bounds the JVM or Tomcat to use no more than one core? Thanks in advance.

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  • Does this variable need to be declared volatile?

    - by titaniumdecoy
    Does the out variable in the MyThread class need to be declared volatile in this code or will the "volatility" of the stdout variable in the ThreadTest class carry over? import java.io.PrintStream; class MyThread implements Runnable { int id; PrintStream out; // should this be declared volatile? MyThread(int id, PrintStream out) { this.id = id; this.out = out; } public void run() { try { Thread.currentThread().sleep((int)(1000 * Math.random())); out.println("Thread " + id); } catch (InterruptedException e) { e.printStackTrace(); } } } public class ThreadTest { static volatile PrintStream stdout = System.out; public static void main(String[] args) { for (int i = 0; i < 10; i++) { new Thread(new MyThread(i, stdout)).start(); } } }

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  • unit-testing maven plugins

    - by Don
    Hi, I'm looking for information about how to write unit tests for Maven plugins. Although there's a page on the Maven site about this topic, there's only one example unit test, which does nothing useful. I also found this wiki page, but it hasn't been updated for more than 4 years, so I'm reluctant to invest any faith in it. I checked the book "The Definitive Guide to Maven", but it doesn't even mention the subject. I'd like to write my unit tests in either Groovy or Java, and would appreciate any information about how to do this. Thanks, Don

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  • my jComboBox does not react to my keyListener and actionPerform perfroms weired stuff

    - by aladdin
    hi I am trying to search for UserName and return values onto jComboBox, here is the code public void actionPerformed(java.awt.event.ActionEvent e) { sr = new Search(((String) jComboBoxReceiver.getSelectedItem())); usrList = sr.searchUser(); String[] userList = new String[usrList.size()] ; for(int i=0;i<usrList.size();i++){ userList[i]= usrList.get(i).getUserName(); } model = new DefaultComboBoxModel(userList); jComboBoxReceiver.setModel(model); } However, if i do that, it does perform correctly, however, it will go search for the first item again, which is very confusing... then i tried using key Pressed if(e.getKeyCode()==13){ sr = new Search(((String) jComboBoxReceiver.getSelectedItem())); usrList = sr.searchUser(); String[] userList = new String[usrList.size()] ; for(int i=0;i<usrList.size();i++){ userList[i]= usrList.get(i).getUserName(); } model = new DefaultComboBoxModel(userList); jComboBoxReceiver.setModel(model); } And this one does not react at all ...

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  • BlackBerry project version number

    - by Seva Alekseyev
    I have a BlackBerry Java project in Eclipse. It has version number written down in four different spots: in the project properties, under "BlackBerry Project Settings/General" in the JAD file, under MIDlet-1 in the JAD file, under MIDlet-Version in the ALX file, under <version> And they seem uncorrelated. Changing either of these affects none of the rest. The third one is what the users sees during over-the-air setup and under Options/Advanced. Questions - why do we need all these? Are there contexts where numbers 1, 2, 4 come up? It's my understanding that the ALX is generated during compilation - where does the version # come from? Is there a way to learn at least one of those programmatically (without signing the app)?

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  • Why Eclipse does not see .jar file of a library?

    - by Roman
    I have a java project in which I have "Referenced Libraries". In the "Referenced Libraries" I have a .jar file of a library that I use (I use only one external library). When I try to "Run - Run" the code I have a NullPointerException. From my previous experience I know that it it (very likely) because my code does not see the library. I just started to use Eclipse and it can be the I do not "connect" libraries in a correct way. Should I use some options or additional action to force Eclipse to see the .jar file of the library? ADDED: By the right click on the library I get a drop-down menu in which I see "Build Path". My be I need to do something there?

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  • Write a function in c that includes the following sequence of statements [Wont Compile]

    - by Cody
    There is a question in my programming languages textbook that is as follows: Write a C function that includes the following sequence of statements: x = 21; int x; x = 42; Run the program and explain the results. Rewrite the same code in C++ and Java and compare the results. I have written code, and played with it in all three languages but I can not even get it to compile. This includes declaring x above the three lines as well as in the calling function (as this question is obviously attempting to illustrate scoping issues) I'd like to explain the results and do the comparisons on my own, as it is an assignment question but I was wondering if anyone had any insight as to how to get this code to compile? Thanks

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  • How to send all previously generated data to new Flex client when using BlazeDS streaming?

    - by Sergey
    Hello. I have a Flex client and Java back-end connected with each other via BlazeDS. I use streaming for real-time data push from server to client. Everything works fine, but I want to add the following functionality: when the new client opens Flex application, he must receive all previously generated data instead of just subscribing to data updates. It seems like I have to save this data at the web server - that's pretty straightforward, but how can I push this data to new client when he connects? Should I use custom ServiceAdapter or there is a better way to achieve this purpose?

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