I have a very strange problem with regards to contributing to Eclipse. I have modified bundle org.eclipse.jdt.internal.junit4.runner and just wanted to test it and try it, but for some strange reason my breakpoints in the bundle **org.eclipse.jdt.internal.junit4.runner** are not working. It sounds to me that there is an internal filtering that cause that these bundles are ignored for breakpoint. 

Funny thing is when I add

```
System.err.println("Did you reach it?"); //$NON-NLS-1$

```

In the console I can see the text, but the breakpoint is not working...

Any advice would be very welcome.