Eclipse, jars, and noClassDefFoundError

[Karl Beowulph]

Hello.

I have a very simple program called HelloWorld. I can't seem to jar it up properly though.

.classpath

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
<classpathentry kind="lib" path="lib/log4j.jar"/>
<classpathentry kind="output" path="bin"/>
</classpath>

Manifest.mf

Manifest-Version: 1.0
Main-Class: helloWorld.HelloWorld

Jar contents
.classpath
.project
HelloWorld.class helloWorld\
HelloWorld.java helloWorld\
log4j.jar lib\
Manifest.mf meta-inf\

When I attempt to run the JAR I get the following:

C:\test>java -jar helloWorld.jar
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Logger
        at helloWorld.HelloWorld.<clinit>(HelloWorld.java:6)

The contents of HellowWorld is:

package helloWorld;
 
import org.apache.log4j.Logger;
 
public class HelloWorld {
static  Logger log = (Logger) Logger.getInstance(HelloWorld.class.getName() );

public static void main(String[] args) {
System.out.println("Hello World!");
 
}

I'm not sure if this would have any effect, but my java version is not the same as what I'm using to build the project.

C:\test>java -version
java version "1.5.0_14"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_14-b03)
Java HotSpot(TM) Client VM (build 1.5.0_14-b03, mixed mode, sharing)

I'm using j2sdk1.4.2_12 as my library within the project. I've set JAVA_HOME to be "C:\j2sdk1.4.2_12".

Lastly, I'm building the JAR with Red Hat Developer Studio (Beta 1), though this seems to be a fairly common issue with Eclipse in general.

Can anyone offer any insight as to what I'm doing incorrectly?

[ December 12, 2007: Message edited by: Karl Beowulph ]
[ December 12, 2007: Message edited by: Karl Beowulph ]

[Joanne Neal]

You cannot put one jar file inside another jar file. You need to put the log4j jar file in the same directory as your jar file and then include it in the classpath setting in your manifest file.
See the manifest section of this for more information.

[Michael Breuer]

To put a jar inside a jar there is a tricky solution with
onejar OneJar