title: ant task to remove files from a jar
body: <p>How to write an ant task that removes files from a previously compiled JAR?</p>
  
  <p>Let's say the files in my JAR are:</p>
  
  <pre><code>aaa/bbb/ccc/Class1
  aaa/bbb/ccc/Class2
  aaa/bbb/def/Class3
  aaa/bbb/def/Class4
  </code></pre>
  
  <p>... and I want a version of this JAR file without the <code>aaa.bbb.def</code> package, and I need to strip it out using ant, such that I end up with a JAR that contains:</p>
  
  <pre><code>aaa/bbb/ccc/Class1
  aaa/bbb/ccc/Class2
  </code></pre>
  
  <p>Thanks!</p>