How to debug hotspot integrated with java codes

[Colin(Du Li)]

Hi, guys.

Now I'm debugging Hotspot. I'm using GDB. When I debug the source codes
written in  c++, it's fine. But if the VM has launched, I cannot trace into
the source codes written in java. e.g. When I find Hotspot cannot load some
class, and I wanna step into the class java.lang.ClassLoader ,  I don't know
how to trace it. Apparently, I cannot do that with GDB. 
Can you guys give me some suggestion for debug in this situation?
I spend several days on this problem, and really need  some help on the
debug things.

Thanks a lot in advance!!



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