Develop Reference

connect to server socket running in eclipse

I want to connect a Client written in Perl and running via command line to a server written in java and running in Eclipse. It don't work, it's because the server is running in Eclipse ? when I try to run the server via command line I got an error, but in eclipse it work fine
java MultiThreadServer
Exception in thread "main" java.lang.NoClassDefFoundError: MultiThreadServer (wrong name: inet/MultiThreadServer)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

I think that is a classpath issue.
The NoClassDefFoundError indicates that the classloader can't find the .class file that you're trying to use. You should set the classpath when executing your code.
See
Classpath in Java

java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing in Intellij

I used Intellij Idea 12 Community edition. I am trying to create test case for my class by creating test case. When i run my test case it says
java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at org.junit.internal.builders.JUnit4Builder.runnerForClass(JUnit4Builder.java:10)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:26)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:44)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:195)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:63)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.lang.ClassNotFoundException: org.hamcrest.SelfDescribing
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 25 more
How would i run test case in Intellij. I included the junit4.11 jar file to my module

Did you include the hamcrest-core-1.3.jar file in your classpath? If not included means include that jar and try once again.

add junit.jar to your project dependence.
you may also need to add hamcrest.jar in addition.
Open File->Project Structure,Click Modules->Dependences,add junit.jar.

Latest version of hamcrest-all is available at:
https://search.maven.org/search?q=a:hamcrest-all
Download this version (as opposed to the hamcrest-core) and that should do it.

If you come across this (and a few other threads) on this error and adding the jar to dependencies doesn't work, you will need to add to the general java classpath.
I encountered this error in OSX where maven would download the dependency, but not find it when in fork mode.
Adding all the hamcrest jars to Library/Java/Extensions finally fixed the problem when nothing else would.

Error in Loading SQLSERVER Driver in jdbc

I am using SQLSERVER 2008 R2
While loading SQLServer Driver in jdbc using statement
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
I am getting error with
java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at ConnectMSSQL.main(ConnectMSSQL.java:19)
I also set sqljdbc4.jar file in classpath but still getting same error, please help guys, my task is almost in delay.

As per the following mentioned sit:
http://social.msdn.microsoft.com/Forums/en-US/sqldataaccess/thread/b425c201-9882-4a48-b049-4004f202b0c6
you need to set the path of the jar file into your classpath. For more details please visit the above mentioned site.

Having issues trying to run a standalone Java 6 program which is packaged in a war file and deployed under tomcat 7

The issue is that when I run it via Eclipse Juno by clicking on it and "Run as Java Application" it works,
but it needs to be to run in a Linux shell script or at least from the Linux shell.
I need it to append all the jar files from $CATALINA_HOME/webapps/myapp/WEB-INF/lib to my classpath.
Here's my code:
package com.myapp.client;
public class ClientApp {
public static void main(String args[]) {
System.out.println("Hi Client");
}
}
When I cd into $CATALINA_HOME/webapps/myapp/WEB-INF/classes/com/myapp/client issue the following command:
java -classpath "/home/devuser/DevTools/apache-tomcat-7.0.32/webapps/myapp/WEB-INF/lib/*:." ClientApp
I receive this exception:
Exception in thread "main" java.lang.NoClassDefFoundError: ClientApp (wrong name: com/myapp/client/ClientApp)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: ClientApp. Program will exit
When I go to my home dir (/home/devuser) and type this in, it still doesn't work:
java -classpath "/home/devuser/DevTools/apache-tomcat-7.0.32/webapps/myapp/WEB-INF/lib/*:." $CATALINA_HOME/webapps/myapp/WEB-INF/classes/com.myapp.ClientApp
Exception in thread "main" java.lang.NoClassDefFoundError: /home/devuser/DevTools/apache-tomcat-7/0/32/webapps/myapp/WEB-INF/classes/com/myapp/ClientApp
Caused by: java.lang.ClassNotFoundException: .home.devuser.DevTools.apache-tomcat-7.0.32.webapps.myapp.WEB-INF.classes.com.myapp.ClientApp
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: /home/devuser/DevTools/apache-tomcat-7.0.32/webapps/myapp/WEB-INF/classes/com.myapp.ClientApp. Program will exit.
Thank you for taking the time to read this... Would appreciate it if someone could assist me.

All of your libraries and classes need to be in your classpath, then the next argument is the path to your class.
java -cp '.:/path/to/libdir/*:/path/to/myapp.war' com.myapp.client.ClientApp

NoClassDefFoundError error on Mac with NetBeans

I am getting a NoClassDefFoundError error when I run my program. Here is the stack trace:
Exception in thread "main" java.lang.NoClassDefFoundError: ex7/Ex7
Caused by: java.lang.ClassNotFoundException: ex7.Ex7
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Java Result: 1
How do I fix this? I'm on a Mac and running NetBeans.

It seems class Ex7class from package ex7 isn't in classpath. recheck the class try clean build