Solution (Sun Java System Application Server Platform Edition 9 Release Notes)

Sun Java System Application Server Platform Edition 9 Release Notes

Previous: A query selecting a relationship field does not include null in the query result.
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Solution

Select a state field from the related instance.

SELECT c.customerId FROM Order o LEFT OUTER JOIN o.customer c

Previous: A query selecting a relationship field does not include null in the query result.
Next: EntityManager.find() erroneously throws an IllegalArgumentException

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