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[SOLVED] An Entity or IdClass class should implement the Serializable interface.

Error added: 2008-06-08T20:38:25Z

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JPA 2.0 Final says:
If an entity instance is to be passed by value as a detached object (e.g., through a remote interface), the
entity class must implement the Serializable interface.

This means that "should implement" is conditional!
Don't implement it if you don't need to pass an entity instance as a detached object.

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