title: way to merge jars in maven?
body: <p>I have a maven project which uses the shade plugin to create a jar from several projects.</p>
  
  <p>In addition it is possible with this plugin to create a source jar from these several projects.</p>
  
  <p>For legacy reason we need to have one jar which contains classes and sources, so the combination of the two jars created by the shade plugin.</p>
  
  <p>What is the best way (preferable in maven) to merge these two jars ? </p>
  
  <p>I found the One-Jar but this apparently combines all dependencies - but I want to explictly say "merge this jar and that jar".</p>
  
  <p>Thanks for any help</p>