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1. JPA Criteria Tutorial    stackoverflow.com

I've been trying to find a JPA Criteria API tutorial but haven't been much successful. Do you know about any for beginners? I'd like to start using it in an Java5/Maven ...

2. How can I troubleshoot JPA join annotation problems?    stackoverflow.com

The JPA join annotations are essential to using JPA but I find it challenging to find good, in-depth documentation about them. My typical experience is I think something is working ...