Using internal sun classes with javac

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I have found the answer myself.

When javac is compiling code it doesn’t link against rt.jar by default.
Instead it uses special symbol file lib/ct.sym with class stubs.

Surprisingly this file contains many but not all of internal sun classes.
In my case one of those more-internal-than-usual classes was sun.awt.event.IgnorePaintEvent.

And the answer to my question is: javac -XDignore.symbol.file

That’s what javac uses for compiling rt.jar.

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