title: I get "Source not found" when debugging my Java code in Eclipse
body: <p>I'm trying to debug my Java application in Eclipse however when I hit a breakpoint I simply see the following instead of my source:</p>
  
  <p><img src="https://i.stack.imgur.com/0alrQ.png" alt="Source not found message"></p>
  
  <p>If I change the stack frame in the Debug window then I can see the function name change in the tab - this is definitely my code, the line number is correct and I'm using the latest build but I still can't get Eclipse to show the source (despite it being open in another tab!)</p>
  
  <p>I'm new to Eclipse and so I'm struggling to find my way around, but everything that I've stumbled across so far seems fine to me.</p>
  
  <p>What might cause this to happen and how can I fix it?</p>