Two persistence units containing the same class cannot currently be deployed in the same EAR file. (Sun Java System Application Server Platform Edition 9 Release Notes)

Sun Java System Application Server Platform Edition 9 Release Notes

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Two persistence units containing the same class cannot currently be deployed in the same EAR file.

Solution

Use different class names.

Previous: In some cases, the query compiler throws a misleading error message, because it mentions the wrong token in the error message.
Next: You cannot list MappedSuperclass explicitly using class element in persistence.xml.

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