title: Is there are way to patch jar files?
body: <p>Suppose I sent a large jar or war file to someone.  Could I later just change one small section and send that to him?  Suppose I just changed one class file.  I recompiled the java for into a class file.  Other then exchanging the new class file for the old class file it there anything else I would have to do?</p>
  
  <p>In java do you have to rebuild the entire jar/war file?  Also, is there some open source package available for doing updates?</p>