John Carroll is the man.

To everyone who has been wondering how to debug the java jdk classes, here's your answer:

The default rt.jar doesn't have all debug symbols (it only has local variables or only fields or something), so you can either build your own with debug symbols (download source ) or I think you can download rt.jar with debug symbols somewhere on java.net (can't find it at the moment).

After I found all this out, I figured I might as well figure out my problems without debugging in the jdk...