As discussed on the pull requests, I'm not sure under what context the 'columnNames=""' would occur, but it's seems like a mistake in the application. That would generate something like:

"add constraint foo unique ()"

So, what's the point of even having @UniqueConstraint at all?

Regardless, NPE probably isn't the best there. The fix allows the AnnotationException to be thrown.

Thanks to Nikolay Shestakov for the pull request.

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