title: How to change Eclipse's "associated source" for debugging?
body: <p>I have a jar file that supplies some classes in my development environment.  When I'm debugging in Eclipse, when I first step into a class supplied by that jar, Eclipse prompts me to give the location of the associated source files.  I do so, and everything's fine.</p>
  
  <p>Some time later, I replace the jar with a newer version.  How can I instruct Eclipse to look in a different place for the newer source?</p>