I see. I specifically had problems with relation tables though. I had
columns generated as _attribute_OTHERTABLENAME and the first _
didn't make
it through Derby. Hence the necessary usage of @ElementJoinColumn.
Are these mandated by the spec as well?
Yes. And as I said, there are standard annotations for renaming any
columns in a standard mapping; you don't need to use @ElementJoinColumn.
http://incubator.apache.org/openjpa/docs/latest/manual/
manual.html#jpa_overview_mapping_assoccoll
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