Running eclipse on gcj, if I get a backtrace when running the program, you should be able to double-click one of the frames in the trace and jump to that point in the code. I think I saw this working in eclipse running on the sun jvm.
I just tested this problem with: public class Test { public static void main(String[] args) { new Exception().printStackTrace(); } } and with: eclipse-platform-3.1.0_fc-0.M5.17 gcc-java-4.0.0-0.40 Clicking on entries in stack trace jumped to the correnct place in the code. This issue seems to have been resolved.