Debugger is not showing some variables

OK, I'm lost again:
The debugger runs correctly, and it shows everything correctly in almost all situations. But sometimes I get something like this:

jIDEA debugger Problem.JPG
I was searching and I found that many classes from the JDK can't be debugged because they were not compiled with debug info. Even more I found a list of those classes in Settings | Debugger | Stepping

The strange is I'm not stepping those classes, How you can see from the image, the class is GotoDeclarationAction (I'm trying to figure out how to open a class knowing their name only).

The API documentation is very poor, so my only documentation is the debugger right now, and if that doesn't show me the local variables then I don't know how to continue :(

Any hint is welcome.
Thanks !

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