Sunday, July 17, 2011

Multiple Java JARs in a JAR

After looking around for a way to compile the dependant jars of my java app into a single java jar with my app, I finally found the solution here

So for context, I was playing with JOGL (JSR-231) and found myself having to append the jogl.jar and gluegen-rt.jar to the classpath to compile and run my toy app. I finally decided to do it the right way and throw everything into a single Jar file for simplicity and ease of distribution. Thankfully the jar archiver tool rocks and made this a lot simpler than the other solutions I read online about using OneJar.

My Manifest.txt file looks like this:
Manifest-Version: 1.0
Main-Class: App
Class-Path: extralibs/gluegen-rt.jar extralibs/jogl.jar
My file layout looks like this:
- mylibs/
- extralibs/
- jogl.jar
- gluegen-rt.jar
- Manifest.txt
And finally the jar line that create the jar file from my app sources and the extra jogl jars:
jar cfm Exec.jar extralibs/Manifest.txt App.class mylibs/*.class extralibs/*.jar
So now by running that, I get a single JAR archive that contains my application and the dependant jars with their correct classpaths :)