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• problem in loading class from 'me.prettyprint.hector.api.Serializer'

  - by dhananjay patil

  I have created executable jar but having some problem with Class not found Exception. When I type command: java -jar JarFileName.jar arguments.. I get error message, Exception in thread "main" java.lang.NoClassDefFoundError: me/prettyprint/hector/api/Serializer at com.ensarm.niidle.web.scraper.NiidleScrapeManager.main(NiidleScrapeManager.java:21) Caused by: java.lang.ClassNotFoundException: me.prettyprint.hector.api.Serializer at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) ... 1 more please tell me solution for this,class is not getting loaded from the external jar

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• Finding the actual runtime call tree of a Java Program

  - by Chathuranga Chandrasekara

  Suppose I have a big program that consists of hundreds of methods in it. And according to the nature of input the program flow is getting changed. Think I want to make a change to the original flow. And it is big hassle to find call hierarchy/ references and understand the flow. Do I have any solution for this within Eclipse? Or a plugin? As an example, I just need a Log of method names that is in order of time. Then I don't need to worry about the methods that are not relevant with my "given input" Update : Using debug mode in eclipse or adding print messages are not feasible. The program is sooooo big. :)

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• JBoss deployment throws 'java.util.zip.ZipException: error in opening zip file' on Linux?

  - by Kaushalya

  I thought of posting both the question and the answer for others' knowledge. I deployed a large EAR (contained more than ~1024 jars/wars) on JBoss running with Java 6 on Linux, and the deployment process cried throwing the following exception: java.lang.RuntimeException: java.util.zip.ZipException: error in opening zip file) at org.jboss.deployment.DeploymentException.rethrowAsDeploymentException(DeploymentException.java:53) at org.jboss.deployment.MainDeployer.init(MainDeployer.java:901) at org.jboss.deployment.MainDeployer.init(MainDeployer.java:895) at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:809) at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:782) .... Caused by: java.lang.RuntimeException: java.util.zip.ZipException: error in opening zip file at org.jboss.util.file.JarArchiveBrowser.<init>(JarArchiveBrowser.java:74) at org.jboss.util.file.FileProtocolArchiveBrowserFactory.create(FileProtocolArchiveBrowserFactory.java:48) at org.jboss.util.file.ArchiveBrowser.getBrowser(ArchiveBrowser.java:57) at org.jboss.ejb3.EJB3Deployer.hasEjbAnnotation(EJB3Deployer.java:213) .... This was caused by the 'limit of number of open file descriptors' of Linux/Unix operating systems. The default is 1024. You can check the default value using: ulimit -n To increase the number of open file descriptors (say to 2048): ulimit -n 2048 Check the man page of ulimit for more details.

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• Python vs. Java performance (runtime speed)

  - by Bijan

  Ignoring all the characteristics of each languages and focusing SOLELY on speed, which language is better performance-wise? You'd think this would be a rather simple question to answer, but I haven't found a decent one. I'm aware that some types of operations may be faster with python, and vice-versa, but I cannot find any detailed information on this. Can anyone shed some light on the performance differences?

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• Error in executing

  - by Saranya.R

  Hi........ I am interested in sending tweets using Java program.I wrote the following prgram.It doen't show any error in compiling.But while executing it shows "Exception in thread "main" java.lang.NoClassDefFoundError: hi Caused by: java.lang.ClassNotFoundException: hi at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) Could not find the main class: hi. Program will exit." This is my code.. package twitter; //import java.lang.object; import net.unto.twitter.*; import net.unto.twitter.TwitterProtos.Status; public class hi { public static void main(String args[]) { Api api = Api.builder().username("usename").password("password").build(); api.updateStatus("This is a test message.").build().post(); } } Can anybody help me ..Pls

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• Getting the class of an n dimensional array of an runtime supplied class name

  - by MeBigFatGuy

  Given a fully qualified class name, and a number of dimensions, i would like to get the Class name for this class. I believe i can do this like such public Class<?> getArrayClass(String className, int dimensions) throws ClassNotFoundException { Class<?> elementType = Class.forName(className); return Array.newInstance(elementType, new int[dimensions]).getClass(); } However this requires me to create an unneeded instance of the class. Is there a way to do this without creating the instance? It does not appear that Class.forName("[[[[Ljava/lang/String;") (or a algorithmically generated version) works correctly in all instances from various blog posts i've seen.

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• java increase xmx dynamically at runtime

  - by Tomer

  Hi, I have a jvm server in my machine, now I want to have 2 apservers of mine sitting in same machine, however I want the standby one to have a really low amount of memory allocated with xmx because its passive, one the main server (active) goes down I want to allocate more memory to my passive server which is already up without restarting it (I have have them both having too much xmx - note they would consume memory at startup and I cant allow possibility of outOfMemory). So I want passive - low xmx once active goes down I want my passive to receive much more xmx. is there a way for me to achieve that. Thanks

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• Difference between Unchecked exception or runtime exception.

  - by giri

  Hi this was the question me in the interview. What is the main difference between Unchecked exception and error as both are not caught.They will terminate the program. I was bit puzzled. Can anybody elaborate on this.

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• runtime/compile time polymorphism

  - by dmadhavaraj

  Hi , In the below code , why b1.subtract() fails . Please explain me the reason ie., what happens in JVM while invoking that method . class Base { public void add() { System.out.println("Base ADD"); } } class Child extends Base { public void add(){ System.out.println("Child ADD"); } public void subtract() { System.out.println("Child Subtract"); } } class MainClass { public static void main(String args[]) { Base b1 = new Base(); Base b2 = new Child(); Child b3 = new Child(); b1.add(); b1.subtract(); // ?????????** b2.add(); b3.subtract(); } }

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• How can I change jtable height at runtime

  - by wniroshan

  I hava a JFrame with multiple JPanels of similar width aligned one below other. I use one of these JPanels to display a JTable which is the last JPanel of the lot. This JPanel has a JScrollpane as a child component. This is where I try to add my table dynamically. Initial height of this JScrollpane is set to 40. I designed above template using Netbeans 6.8 Now I'm trying to add the table to the JPanel. When a button is pressed below code snippet is called. The class which includes this code extends javax.swing.JFrame class. I am expecting below code would adjust table height according to the row count and display the table. SearchTable = new JTable(RowData, DisplayNames) { @Override public boolean isCellEditable(int rowIndex, int vColIndex) { return false; } }; // if row count is less than 10 then display all the rows without a scroll bar if (SearchTable.getRowCount() < 10) { pnl_tblpanel.setPreferredSize(new Dimension(625, SearchTable.getRowHeight() * (SearchTable.getRowCount() + 4))); scr_tblholder.setPreferredSize(new Dimension(625, SearchTable.getRowHeight() * (SearchTable.getRowCount() + 4))); } else {// if row count is more than 10 display first 10 rows and add a scroll bar pnl_tblpanel.setPreferredSize(new Dimension(625, SearchTable.getRowHeight() * (10 + 2))); scr_tblholder.setAutoscrolls(true); } //pnl_tblpanel.add(scr_tblholder); scr_tblholder.setViewportView(SearchTable); //pnl_tblpanel.repaint(); pnl_tblpanel.validate(); this.validate(); //this.repaint(); pnl_tblpanel.setVisible(true); this.pack(); The table displays, but the table height is not changed according to the row count. It stays its default value. I have been trying many combinations of validate and repaint but nothing worked. (More in desperation) Can anyone shed some light on this Thank you

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• Java applet wont run

  - by Courtney

  I am trying to get a Java applet to run properly when linked to an HTML page in Dreamweaver CC. I'm new to all this so please bear with me here. First I saved this code to a .java file //Triangle.java import java.awt.*; import java.applet.Applet; public class Triangle extends Applet { public void paint (Graphics g){ int bottomX=80; int bottomY=200; int base=100; int height=100; g.drawLine(bottomX,bottomY,bottomX+base,bottomY); g.drawLine(bottomX+base,bottomY,bottomX+base/2,bottomY-height); g.drawLine(bottomX+base/2,bottomY-height, bottomX,bottomY); } } I then compiled it entering javac Triangle.java After that, I inserted it into a Dreamwever page using: <html> <applet code=Triangle.class width=400 height=400 > </applet> </html> Now when I try and open the page in Chrome I get an error reading: UnsupportedClassVersionError Triangle: Unsupported major.minor version 52.0 This, as I have read, is an issue with using two incompatible Java versions? In my Java Control Panel it says I am using version 1.8.0_20 and my JDK is jdk1.8.0_20. Does anyone see anything super obvious that I am doing wrong here?

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• How to delete Drawn Line in java?

  - by Jeyjey

  Hello Folks, well this is my code: import javax.swing.; import javax.; import java.awt.; import java.awt.Color; import java.awt.Graphics.; import java.awt.event.*; import javax.swing.UIManager; public class SimpleGUI extends JFrame{ public SimpleGUI(){ this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) ; } public void go(){ Drawpanel = new Mypanel(); JFrame frame = new JFrame("Chasing Line"); frame.getContentPane().add(BorderLayout.CENTER, Drawpanel); frame.setSize(300,300); frame.setVisible(true); Drawpanel.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() { public void mouseMoved(java.awt.event.MouseEvent evt) { DrawpanelMouseMoved(evt); } }); } public void DrawpanelMouseMoved(java.awt.event.MouseEvent evt) { xpos=evt.getX(); ypos=evt.getY(); System.out.println("Coordinates : X :"+ xpos+"Y: "+ypos); Drawpanel.paintImage(xpos,ypos); } class Mypanel extends JPanel{ public void paintImage(int xpost,int ypost){ Graphics d = getGraphics(); d.setColor(Color.black); d.drawLine(xpost, 0, xpost, this.getHeight()); d.setColor(Color.red); d.drawLine(0, ypost, this.getWidth(),ypost); this.validate(); } } // end the inner class public static void main(String[] args){ try { UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); } catch(Exception e) { System.err.println("Look and feel not set"); } SimpleGUI win = new SimpleGUI(); win.go(); } Mypanel Drawpanel; private int xpos=0; private int ypos=0; } // close SimpleGUI class The problem is how can i delete the old lines?, i mea,make only the current x and y lines appear on the screen, make the intersection between both lines "follow" the mouse pointer. thanks for any reply.

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• Trying to get the associated value from an Enum at runtime in Java

  - by devoured elysium

  I want to accomplish something like the following (my interest is in the toInt() method). Is there any native way to accomplish this? If not, how can I get the integer associated with an enum value (like in C#) ? enum Rate { VeryBad(1), Bad(2), Average(3), Good(4), Excellent(5); private int rate; private Rate(int rate) { this.rate = rate; } public int toInt() { return rate; } } Thanks

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• Clearing Java certificates cache (force reload certificates)

  - by AlbertoFEM

  A simple question here. One application gave me this exception when trying to access a website with a expired certificate: java.security.cert.CertificateExpiredException So, I renewed the certificated from the website machine and restarted it. When I try to access it from Firefox or Chrome it will load the new certificate (which it's expiration date is set somewhere near 2040). The problem is, Java applications doesn't seems to renew this certificate, it seems to be stuck in some kind of internal cache. I already tried to add it to the keystore and set options in the application properties like -Dcom.sun.net.ssl.checkRevocation=false. No matter what I do, it always throw me a java.security.cert.CertificateExpiredException Any ideas?

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• Performance problems when running Java desktop applications on Citrix Metaframe

  - by demetriusnunes

  We have a desktop Java application running within a Citrix Metaframe server farm and the performance, specially while starting up the app, is very unreliable. Sometimes it takes 15 seconds and sometimes it takes over a minute. It's really unpredicatable. Is there any way to optimize running Java desktop applications within Citrix Metaframe Terminal server sessions to a more reliable performance level? Are there any optimization directed specifically toward Java, such as pre-load JVMs or something like that? Any help would be greatly appreciated.

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• Java Problem when i upgraded from IE 7 to IE 8

  - by user38210

  I face problem with upgrading IE8 related to JAVA. The problem only with IE8, IE7 is OK and I have the latest Java version. After I upgrade the IE8, the graphics which has dynamics reading from the server is not updating and it shows NaN. I tried the following : - upgrade the server win2003 with latest Java version(JRE and JDT) , but the problem still exist in cliend PC(XP). -I upgraded the server IE8, then all user lost the connection even from inside the server. then I recall the prev version IE7.

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• Problems to export java home and to find or create .bashrc in Mac OS 10.6

  - by casiopea

  Hello, I need to install a program for my studies and, this program, need java to run. When I try to perform the installation say that cannot find the JDK; since the JDK is already installed by default in mac, the problem is export the java home. I´ve try a lot and I cant do it! I know that I have to add a line in a .bashrc file (or .profile, or .bash_profile) I´ve created all those files, at different times but nothing... I´m a new mac user, but I use Linux too and I dont know what happened, I just need to export java home to perform my work... and is really necessary for me to add environment variables too. Thanks for your help

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• Problems to export java home and to find or create .bashrc in Mac OS X 10.6

  - by casiopea

  Hello, I need to install a program for my studies and, this program, need java to run. When I try to perform the installation say that cannot find the JDK; since the JDK is already installed by default in mac, the problem is export the java home. I´ve try a lot and I cant do it! I know that I have to add a line in a .bashrc file (or .profile, or .bash_profile) I´ve created all those files, at different times but nothing... I´m a new mac user, but I use Linux too and I dont know what happened, I just need to export java home to perform my work... and is really necessary for me to add environment variables too. Thanks for your help

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• Java sound doesn't work under Linux

  - by Cliff

  Help! I'm getting frustrated by the individual hoops I have to go through to eek sound out of my speakers when running Java apps on Linux platforms! I just installed Fedora 12 and after downloading and running the Java Sound Demo I get exceptions. If I run just a vanilla Java program that plays a wav file it runs silently with no sound and no exceptions. Every other app seems to play sound. I also took some advice from this thread in the Ubuntu forums which almost seemed to work. (Installing aoss got rid of the initial exceptions in the sound demo but I still hear nothing when I play.) can somebody help me figure out what's wrong?

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• Issues running java in Solaris 9 container

  - by Matthew Watson

  Hi, I have a solaris 9 container built from a physical server using flarcreate. Everything seems fine, except when trying to trying to run any "java -server" process it fails with the following error This is on a Sunfire T1000 machine running Solaris 10 10/09 s10s_u8wos_08a SPARC Running jdk1.5.0_15 Exception java.lang.OutOfMemoryError: requested -4 bytes for size_t in /BUILD_AREA/jdk1.5.0_15/hotspot/src/os/solaris/vm/os_solaris.cpp. Out of swap space? As far as I can tell I'm not actually out of swap space. Running java in client mode works without a problem. Googles only suggestion is related to x86. Any suggestions? Thanks.

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• Eclipse Juno failing to start with Java returning 1 error report

  - by Richard Lewin

  I have been using Eclipse Juno on windows 8 without any issues until yesterday when, upon starting Eclipse it shows the initial splash screen and then shows the following message: Eclipse Java was started but returned exit code=1 C:\Windows\system32\javaw.exe -Dosgi.requiredJavaVersion=1.5 -Dhelp.lucene.tokenizer=standard -Xms40m -Xmx384m -XX:MaxPermSize=256m -jar C:\Program Files\eclipse\plugins/org.eclipse.equinox.launcher_1.3.0.v20120522-1813.jar -os win32 -ws win32 -arch x86_64 -showsplash C:\Program Files\eclipse\plugins\org.eclipse.platform_4.2.0.v201206081400\splash.bmp -launcher C:\Program Files\eclipse\eclipse.exe -name Eclipse --launcher.library C:\Program Files\eclipse\plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.200.v20120522-1813\eclipse_1503.dll -startup C:\Program Files\eclipse\plugins/org.eclipse.equinox.launcher_1.3.0.v20120522-1813.jar --launcher.overrideVmargs -exitdata 13f4_5c -product org.eclipse.epp.package.java.product -vm C:\Windows\system32\javaw.exe -vmargs -Dosgi.requiredJavaVersion=1.5 -Dhelp.lucene.tokenizer=standard -Xms40m -Xmx384m -XX:MaxPermSize=256m -jar C:\Program Files\eclipse\plugins/org.eclipse.equinox.launcher_1.3.0.v20120522-1813.jar OK At this point Eclipse does not load any further. I have attempted to re-install the Java JDK and JRE without having any effect. I have also re-downloaded Eclipse Juno and run it as a 'fresh' startup which has until now worked initially yesterday

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• Problems to connect Java visualVM to a EC2-instance

  - by kasten

  I'm trying to profile a AWS EC2 instance via visualVM. The instance is in a securitygroup which allows all connections and i'm runing jstatd with a grant codebase "file:${java.home}/../lib/tools.jar" { permission java.security.AllPermission; }; policy on it. When i try to connect from my local machine with visulVM nothing happens. When i use jps i get the following response $ jps -l -m -v rmi://ec2-xxx-xxx-xxx-xxx.compute-1.amazonaws.com Error communicating with remote host: Connection refused to host: xxx.xxx.xxx.xxx; nested exception is: java.net.ConnectException: Connection timed out But i can ssh into the instance and use jps locally. Has anyone a pointer in which direction i can debug further?

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• Java application server behind IIS 7.5 on Windows Server 2008

  - by perissf

  I have a Java application server (GlassFish, indeed, but the problem is the same for any other application server, I guess), running on port 8080. And I have IIS 7.5 listening on port 80 as by default configuration. I want to avoid people typing the port because it's unprofessional. So I want that when somebody types http://myserver the traffic is directed to IIS. And this is how it already works now. But I also want that when somebody types http://myserver/java the traffic is directed to port 8080 and consequently my GlassFish splash screen is displayed. If I have deployed an application on GlassFish under context root app1, typing http://myserver/java/app1 should access the application. How can I do this? I have tried with adding some rules with the URL Rewrite utility from IIS7.5 UI, but this shows the port after the rule has rewritten the url, and I want to avoid it.

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• Java application crashes on startup in citrix session

  - by Brimstedt

  Hello We have a java application published through citrix. When application is launched for a new user, it crashes immediately on startup. If we login using RDP, then log out (not starting the app), it starts to work. We've published another smaller java app, and it works for new users, without the need to first log on using RDP. Steps: - Publish java app - create new user - run published app in citrix -> crash - log on user using rdp, log out - run published app in citrix -> works fine Its becoming real tiresom to log on each new user to each citrix server :-P

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• Linux kernel with grsec + Java / Apache Tomcat

  - by NoozNooz42

  I've got a Debian Linux 64 bit dedicated server. The kernel has the grsec patch applied. I'm mainly using this server to run Apache Tomcat (6.0.26, Java 6) and everything seems fine. The only issue, is that when I start Tomcat, I get a few of these: grsec: From xxx.xxx.xxx.xxx: Segmentation fault occurred at 00007fefe04e4000 in /home/t/jre1.6.0_20/bin/java[java:22403] uid/euid:1001/1001 gid/egid:1001/1001, parent /sbin/init[init:1] uid/euid:0/0 gid/egid:0/0 grsec: more alerts, logging disabled for 10 seconds Then no error logs anymore. Everything is fine. The kernel is: Linux 2.6.32.2-xxxx-grs-ipv4-64 #1 SMP Tue Dec 29 14:41:12 UTC 2009 x86_64 GNU/Linux And the webapp works fine. So there are segmentation fault when Tomcat starts, but everything seems to works fine. Is this concerning? Should I move to a non-grsec kernel?

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