PersistentMap MapKey applied to a relation field as key for a java.util.Map
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Key: OPENJPA-1021
URL: https://issues.apache.org/jira/browse/OPENJPA-1021
Project: OpenJPA
Issue Type: Improvement
Components: jpa
Affects Versions: 1.2.0
Reporter: Michael Vorburger
I've tried to use a relation field as key for a java.util.Map, using a
PersistentMap & MapKey annotation.
Ideally, such a mapping should be supported of course. For an example
real-world use case, see the test case I'll attach (it's the same that I posted
to the list last week).
According to Fay Wang on [email protected], this is not possible today
(v1.2.0), see
http://mail-archives.apache.org/mod_mbox/openjpa-users/200904.mbox/%[email protected]%3e
(the short email exchange which lead to the creation of this JIRA).
According to Pinaki Poddar on
http://n2.nabble.com/Map%3CClassA,ClassB%3E-problem-td534546.html this should
work. Either way, the current error message ("Map field ... is attempting to
use a map table, but its key is mapped by another field. Use an inverse key or
join table mapping.") is unclear.
At the very least, the documentation manual should clearly say that this is
explicitly not supported, or include an example if it is, and/or a clear error
message should be printed by the run-time. Ideally it should be a working and
documenting mapping though...
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