Internal field mappings reference incorrect fields when @MappedSuperclass class is not included as managed entity in persistence.xml

If an abstract entity class (marked as @MappedSuperclass) is extended by a concrete entity class and the abstract entity is not include in the persistence.xml as a managed class, OpenJPA incorrectly maps the entity fields.

Based on the SQL trace messages, it would appear that there are two different internal arrays representing the entity fields. The StateManagerImpl._metafield contains an array of all fields on the given entity. However, when the actual field data is fetched, a different backing array of fields is used and it does not match the _metafield array. As a result, the wrong field is updated/fetched.

Attached is a simple maven/junit test case.