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  • Starting memory allocation for JVM.

    - by C. Ross
    I'm beginning use the -Xmx option on the java command to allow my processes to use a little more memory (256Mb, though I think I'm currently using less than 128Mb). I've also noticed the -Xms option for starting memory, with a default value of 2Mb. What should I set this value to and why? Reference: Java

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  • interview questions for a 7 year Exp Guy?

    - by harigm
    What kind of approach I(5 Years Exp In Java J2ee Platform) need to follow to interview 8 years exp Guy in Java and J2ee technology. I am asking all the basic questions, where he is able to answer, if he is atleast the bookish knowledge. I want to ask some thing different where we can check his actual skills in technical. Can any one help me with some thoughts where i can use to get some good and technical challenging questions to ask?

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  • Help with httpcore NIO exception

    - by bruce dou
    I/O error: I/O dispatch worker terminated abnormally Exception in thread "Thread-1" java.lang.IllegalStateException: I/O reactor has been shut down at org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.connect(DefaultConnectingIOReactor.java:190)

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  • "Invalid signature file" when attempting to run a .jar

    - by oskar
    My java program is packaged in a jar file and makes use of an external jar library, bouncy castle. My code compiles fine, but running the jar leads to the following error: Exception in thread "main" java.lang.SecurityException: Invalid signature file digest for Manifest main attributes I've googled for over an hour searching for an explanation and found very little of value. If anyone has seen this error before and could offer some help, I would be obliged.

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  • convert to quewety keybord

    - by lamisse
    hello I'm programming in java using frensh local machine (azerty keybord) I like to type a a text with certain character ("test: hello") but when I launch the test, only "test" is displayed is there methods java allowing to convert":" to the equivalent in quewerty ? thanks

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  • Installing jdk without sudo?

    - by Legend
    Currently, I have a machine on which I am working in Eclipse, it says that the JRE System Library version is sun-jdk-1.5.0.11 but on my active development machine, it is java-6-sun-1.6.0.16. What is the difference between these two (of course, besides the versioning)? Is there any way I can make the first machine to use the same "java-6-sun-1.6.0.16" version without having sudo permissions on the machine?

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  • JEE6 Tutorial samples not found

    - by ManWard
    in this page of tutorial : http://java.sun.com/javaee/6/docs/tutorial/doc/bnadu.html discuss about hello2 application on samples folder. i download samples from this link and installed correctly: https://glassfish-samples.dev.java.net/servlets/ProjectDocumentList?folderID=5214&expandFolder=5214&folderID=0 but "hello2" folder not on the "web" folder. where is source codes for sun JavaEE6 Tutorial Volume I ? thanks alot

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  • Sonar and Eclipse IAM Plugin

    - by Hans Klock
    When I am using the IAM Eclipse Plugin for Maven I get an error while executing the sonar:sonar goal in clean install sonar:sonar The error in eclipse is 23:02:55 MESZ Starting Starting mojoExecution sonar-core:internal 23:03:44 MESZ fatal org.sonar.maven2.BatchMojo#execute() caused a linkage error (java.lang.NoSuchMethodError). Check the realms: ... java.lang.NoSuchMethodError: org.apache.maven.execution.ReactorManager.<init>(Ljava/util/List;)V Any idea how to fix it?

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  • one high-end server with one Application Server or multiple Application Servers?

    - by elgcom
    If I have a high-end server, for example with 1T memory and 8x4core CPU... will it bring more performance if I run multiple App Server (on different JVM) rather than just one App Server? On App Server I will run some services (EAR whith message driven beans) which exchange message with each other. btw, has java 64bit now no memory limitation any more? http://java.sun.com/products/hotspot/whitepaper.html#64

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  • Using MOA to classify new examples?

    - by Sam Zetoloth
    I'm trying to use the java machine learning library MOA to train on a training data stream, then predict classes for a test data stream. The first part works fine, using (for example) java -cp .:moa.jar:weka.jar -javaagent:sizeofag.jar moa.DoTask "LearnModel -l MajorityClass -s (ArffFileStream -f atrain.arff -c -1) -O amodel.moa" But then I cannot figure out how to use the trained model (amodel.moa) on another stream (atest.arff) to predict the classes. Has anyone done this before?

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  • Tools for visualizing and implementing elliptic curve cryptography

    - by LL
    I need to create a program which will show how elliptic curve cryptography works. I was considering using Java Swing to create the GUI, but the main problem is what tool to use to plot the elliptic curve itself, and how to integrate that with Java Swing. I would like the plot to be included in the user interface and also allow changes to be made to it. Can you suggest any tools that would help with this?

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  • Importing MSN contact list

    - by Azhar
    How to import import Msn contact in our application? I want to learn about importing msn contact list in my java appication. Need help on this and where can i find the sample java code for achieving this?

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  • Locating JNLP file contents

    - by pgebhard
    When running a JNLP file, the application is downloaded from the Internet. Where does it store these downloaded files? I'm trying to figure out how to copy the application to a computer without Internet access. FYI, I'm working with Java 1.6 (C:\Program Files\Java\jdk1.6.0_17).

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  • Error while launching soapUi 3.01

    - by Ayrad
    soapui.bat Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/cl i/CommandLineParser Where can I find this library? I already put JAVA HOME to my sdk and I am using windows XP. Any ideas how I can resolve this?

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  • Quick top level server language question.

    - by Shane
    Right, so if you have to decide on a server-side language for a distributed Linux-based server backend, would you choose: PHP Mono ASP.net Java As a C++ programmer, I'm thinking Java+Tomcat, but I'd love to hear experienced thoughts here, especially relating to debugging and IDE (likely Eclipse). Also, please, it's not a flame question. I'm seeing excellent sites written in all, I'm just thinking about the compile/debug/release cycle. Cheers, Shane

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  • Resources for learning Monads, Functors, Monoids, Arrows etc

    - by Dony Borris
    Can you people please suggest some good books / weblinks from where I can get to learn about above mentioned concepts? (Please note that I am a Java programmer and have NO prior experience with functional programming. I have been studying Scala since last one month and would appreciate the resources that try to teach the above mentioned concepts with Scala. (or even Java, if posible))

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  • Thread safety in Singleton

    - by Robert
    I understand that double locking in Java is broken, so what are the best ways to make Singletons Thread Safe in Java? The first thing that springs to my mind is: class Singleton{ private static Singleton instance; private Singleton(){} public static synchronized Singleton getInstance(){ if(instance == null) instance = new Singleton(); return instance; } } Does this work? if so, is it the best way (I guess that depends on circumstances, so stating when a particular technique is best, would be useful)

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  • List input and output audio devices in Applet

    - by Jhonny Everson
    I am running a signed applet that needs to provide the ability for the user to select the input and output audio devices ( similar to what skype provides). I borrowed the following code from other thread: import javax.sound.sampled.*; public class SoundAudit { public static void main(String[] args) { try { System.out.println("OS: "+System.getProperty("os.name")+" "+ System.getProperty("os.version")+"/"+ System.getProperty("os.arch")+"\nJava: "+ System.getProperty("java.version")+" ("+ System.getProperty("java.vendor")+")\n"); for (Mixer.Info thisMixerInfo : AudioSystem.getMixerInfo()) { System.out.println("Mixer: "+thisMixerInfo.getDescription()+ " ["+thisMixerInfo.getName()+"]"); Mixer thisMixer = AudioSystem.getMixer(thisMixerInfo); for (Line.Info thisLineInfo:thisMixer.getSourceLineInfo()) { if (thisLineInfo.getLineClass().getName().equals( "javax.sound.sampled.Port")) { Line thisLine = thisMixer.getLine(thisLineInfo); thisLine.open(); System.out.println(" Source Port: " +thisLineInfo.toString()); for (Control thisControl : thisLine.getControls()) { System.out.println(AnalyzeControl(thisControl));} thisLine.close();}} for (Line.Info thisLineInfo:thisMixer.getTargetLineInfo()) { if (thisLineInfo.getLineClass().getName().equals( "javax.sound.sampled.Port")) { Line thisLine = thisMixer.getLine(thisLineInfo); thisLine.open(); System.out.println(" Target Port: " +thisLineInfo.toString()); for (Control thisControl : thisLine.getControls()) { System.out.println(AnalyzeControl(thisControl));} thisLine.close();}}} } catch (Exception e) {e.printStackTrace();}} public static String AnalyzeControl(Control thisControl) { String type = thisControl.getType().toString(); if (thisControl instanceof BooleanControl) { return " Control: "+type+" (boolean)"; } if (thisControl instanceof CompoundControl) { System.out.println(" Control: "+type+ " (compound - values below)"); String toReturn = ""; for (Control children: ((CompoundControl)thisControl).getMemberControls()) { toReturn+=" "+AnalyzeControl(children)+"\n";} return toReturn.substring(0, toReturn.length()-1);} if (thisControl instanceof EnumControl) { return " Control:"+type+" (enum: "+thisControl.toString()+")";} if (thisControl instanceof FloatControl) { return " Control: "+type+" (float: from "+ ((FloatControl) thisControl).getMinimum()+" to "+ ((FloatControl) thisControl).getMaximum()+")";} return " Control: unknown type";} } But what I get: Mixer: Software mixer and synthesizer [Java Sound Audio Engine] Mixer: No details available [Microphone (Pink Front)] I was expecting the get the real list of my devices (My preferences panels shows 3 output devices and 1 Microphone). I am running on Mac OS X 10.6.7. Is there other way to get that info from Java?

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  • how to remove MouseListener / ActionListener on a JTextField

    - by mithun1538
    Hello everyone, I have the following code adding an ActionListener to a JTextField: chatInput.addMouseListener(new java.awt.event.MouseAdapter() { public void mouseClicked(java.awt.event.MouseEvent evt) { chatInputMouseClicked(evt); } }); Now how do I remove this MouseListener using chatInput.removeMouseListener(), since this function needs an argument?

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  • Why Joda DateTimeFormatter cannot parse timezone names ('z')

    - by dimitrisli
    From DateTimeFormatter javadoc: Zone names: Time zone names ('z') cannot be parsed. Therefore timezone parsing like: System.out.println(new SimpleDateFormat("EEE MMM dd HH:mm:ss z yyyy").parse("Fri Nov 11 12:13:14 JST 2010")); cannot be done in Joda: DateTimeFormatter dtf = DateTimeFormat.forPattern("EEE MMM dd HH:mm:ss z yyyy"); System.out.println(dtf.parseDateTime("Fri Nov 11 12:13:14 JST 2010")); //Exception in thread "main" java.lang.IllegalArgumentException: Invalid format: "Fri Nov 11 12:13:14 JST 2010" is malformed at "JST 2010" //at org.joda.time.format.DateTimeFormatter.parseDateTime(DateTimeFormatter.java:673)

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