title: How to set a breakpoint in Eclipse in a third party library?
body: <p>I'm getting a NullPointerException in a Class from a 3rd party library. Now I'd like to debug the whole thing and I would need to know from which object the class is held. But it seems to me that I cannot set a breakpoint in a Class from a 3rd party. </p>
  
  <p>Does anyone know a way out of my trouble? Of course I'm using Eclipse as my IDE.</p>
  
  <p>Update: the library is open-source.</p>