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Including a jar within a jar

Russell Wurth

Joined: Jul 12, 2004
Posts: 20
I am trying to package a class file with 2 jar files that are in my classpath.

Working directory (source/class file) : c:\eclipse\workspace\MyProject

Within my working directory, I am able to compile and run, creating Test.class. Both files are in my working directory.

Using Ant, I want a single jar that will include 'ar.jar' and 'Test.class' to be run on another environment. I would like to leave 'ar.jar' in the directory that it is currently in.

Here is my build.xml

The problem is that when I run 'java -jar MyJarFile.jar', I get a NoClassDefFoundError since it is not finding 'ar.jar'. The 'ar.jar' file is packaged in MyJarFile.jar, but I cannot figure out the correct Class-Path to reference 'ar.jar'.

Any advice?
Edward Kenworthy
Ranch Hand

Joined: Oct 05, 2003
Posts: 66
You can't do what you're trying to do. You could uncompress the jars you want to include and then re-jar them into the one jar (bad idea by the way: what happens when a new version of those jars becomes available?).

Another option is to simply ship your dependent jars in a subdirectory of your application (eg lib/) and then point your application (easiest would be to set the class-path in your Manifest file). That's what I'd do.

jerry conosm

Joined: Sep 09, 2003
Posts: 10
You should specify each jar files you used in the manifest file. For example, if you have 2 jar files a, b, you should have

Class-Path: a.jar b.jar

entry in the manifest file. Take note that they are separated by space.

Try replacing your class path entries in your script with this:

<attribute name="Class-Path" value= "java/include/.jar">
jerry conosm

Joined: Sep 09, 2003
Posts: 10
oooops! what I mean from above is

<attribute name="Class-Path" value= "java/include/ar.jar">
Ilja Preuss

Joined: Jul 11, 2001
Posts: 14112
What you are trying to do isn't supported by standard java, as far as I know. You can use to do so, though.

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