Check binary compatibility between 2 Jars

Hello,
we have a Java API to our repository product. Is there a way to check binary compatibility between different versions of that API? The problem is that the interfaces evolve and sometimes changes are necessary. So we already had the problem that different versions are incompatible.
I found just one tool: japitool. But it does not detect the latest problem we have.
Thanks in advance
Torsten

I mean the facts and rules described in chapter 13 of the Java language specification (Binary Compatibility; http://java.sun.com/docs/books/jls/second_edition/html/binaryComp.doc.html#44872).
Torsten

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