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Probably not hard with the right API. I've never looked for it so I don't know what is available.

Be sure to let us know what you find and if you are able to get the names and values of the variables on the stack.

Sounds like a useful tool. No idea where to get the data from.
I think I've heard of a debug interface into the JVM but have never seen any samples of it being used.

I understand the concept and have worked with the stack and heap in assembly language.
I don't know of any way to get that information from the JVM.

by "activation stack" Do you mean the call stack?
What are you trying to draw? Can you give an example?

I've never seen any way to access the local variables that the JVM would save on the...