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Linking external jar while launching a jar problem

4 replies on 1 page. Most recent reply: Nov 1, 2005 11:58 PM by Matthias Neumair

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Alexander Serbul

Posts: 4
Nickname: alexserbul
Registered: Oct, 2005

Linking external jar while launching a jar problem

Posted: Oct 31, 2005 1:59 AM

Good day!

I have a little test program:

import org.apache.log4j.Logger;

public class CMDClient {
static Logger log;
public static void main(String args[]) throws Exception {
log.info("test");
System.exit(1);
}
}

After I created a test.jar with only this class included and when I started it with java -jar test.jar it is error: java.lang.NoClassDefFoundError org/apache/log4j/Logger.

I tried to set before launching CLASSPATH=path_to_log4j_jar but it didn't help.

Kondwani Mkandawire

Posts: 530
Nickname: spike
Registered: Aug, 2004

Re: Linking external jar while launching a jar problem

Posted: Oct 31, 2005 2:27 AM

> I tried to set before launching
> CLASSPATH=path_to_log4j_jar but it didn't help.

In Windows its:

set CLASSPATH=path_to_log4j_jar.jar

In *nix it would be:

export CLASSPATH=path_to_log4j_jar.jar

Alexander Serbul

Posts: 4
Nickname: alexserbul
Registered: Oct, 2005

Re: Linking external jar while launching a jar problem

Posted: Oct 31, 2005 4:33 AM

This is my .bat file:

@echo off
set CLASSPATH=F:\CMD-CVS\projects\lib\log4j.jar
echo %CLASSPATH%
java -jar build\client-jars\cmd-client.jar

... and this is not working ;-(

It is interesting, that while I start this test program simply without packaging into jar, it works well.

Alexander Serbul

Posts: 4
Nickname: alexserbul
Registered: Oct, 2005

Re: Linking external jar while launching a jar problem

Posted: Oct 31, 2005 4:51 AM

The problem was: it was needed to set Class-Path attribute in my MANIFEST.

Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

Re: Linking external jar while launching a jar problem

Posted: Nov 1, 2005 11:58 PM

the set command often doesn't do what one would expect.
Therefore I allways include the classpath in the java command or in the manifest.

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