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I have an existing interface:

interface MyInterface { void methodA(); void methodB(); }

I made methodB default and added a default implementation:

interface MyInterface { void methodA; default void methodB() { } }

Suddently, some of the system that uses MyInterface starts to show ClassNotFoundException when they start use the new version of MyInterface.

I am worrying if my change could potentially break backward compatibility. Can someone please advise

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  • Are you running this on a JVM that is from before the era of default interface methods? Commented Mar 1, 2021 at 17:13
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    The change to a default method probably didn't cause a ClassNotFoundException, there were likely problems there already. A change to default method can cause an IncompatibleClassChangeError as has been discussed here Commented Mar 1, 2021 at 17:13
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