title: Java Debugging: Source not found
body: <p>I am having a problem with Eclipse where I can run my program just fine, but when I try to start the debugger, I get this message</p>
  
  <p><img src="https://i.stack.imgur.com/oDea9.png" alt="Eclipse Window showing error"></p>
  
  <p>The picture is a little hard to make out, but instead of getting the normal debugging window, instead it says it is throwing a ClassNotFoundException, and is trying to dislay the source for Launcher$ExtClassLoader.</p>
  
  <p>The thing that really baffles me though is that I can run the code just fine, it is only when I click the debug button that I have the problem.</p>
  
  <p>I have also tried debugging at the command line with JDB, and I got the same error.</p>
  
  <p>So far, I have tried Reinstalling Eclipse and downloading (what I believe to be) the correct Java Development tools for Mac OS X.</p>
  
  <p>I have no idea what else I can try, so any help would be greatly appreciated. Let me know if there is any other information I can provide.</p>