title: Ant <jar> task: using excludes parameter
body: <p>Got a following build.xml string:</p>
  
  <pre><code>&lt;jar destfile="${lib.dir}/rpt.jar" basedir="${classes.src}" excludes="**/*.java" /&gt;
  </code></pre>
  
  <p>I am new to Ant and i don't understand how <em>excludes</em> string works. What files are affected? All java source files?</p>
  
  <p>Thanks.</p>