Why is this JPA 2.0 mapping giving me an error in Eclipse/JBoss Tools?

Question

I have the following situation:
_{(source: kawoolutions.com)}

JPA 2.0 mappings (It might probably suffice to consider only the Zip and ZipId class

Answer 1

I'd say focus your attention on the CompoundIdentity relationship. See this question, and my answer there Help Mapping a Composite Foreign Key in JPA 2.0

ZipId has no "country" field in your case