combine multiple jar files and remove signatures

I just came across a situation where I had to join multiple jar files and my own classes into one jar bundle. Ant comes in handy:

<jar destfile="${app.id}-${app.version}.jar"
  index="true"
  filesetmanifest="merge">
  <fileset dir="${classes.dir}"/>
  <zipgroupfileset dir="${lib.dir}" includes="*.jar" />
</jar>

This takes all the files in ${classes.dir}, packs them in a jar and add the content of all the jar files in ${lib.dir}. In this case, we merge multiple manifests, but this can be changed according to the jar task documentation.
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Tags: ant, jar, signature