How to super-source a single method in a JRE emulated class?

How is it possible to emulate a single JRE method, in my case: Character.isWhiteSpace()?

If I try this I get all kind of AST compiler errors (null pointer exception): A new empty Character.java file in my super-source dir with only the isWhiteSpace() method.

It works if I copy the whole GWT JRE emulated Character.java file and put that in my super-source dir, and add the additional method.

But I only want to add one additional method, not copy the whole GWT JRE file. I don't need that, and might miss any changes done by GWT.

How is this possible?

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