Just a note for those using eclipse: - http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6614100 This issues isn't one with 6u3. A workaround suggested at the page linked to above is to create a file called .hotspot_compiler containing this exclude org/eclipse/core/internal/dtree/DataTreeNode forwardDeltaWith I will test the workaround first. If it really work I'll report here. If it doesn't, I'll use abs to downgrade to 6u3. Best, -- Maik PS: Don't consider me as a java pro. I use eclipse for C++,Fortran and LaTeX.