Hi Mike,
Regarding #2, you can take a look at an Openjpa test case:
org.apache.openjpa.persistence.jdbc.meta.TestMappedByKeyMaps
This test case tests InverseKeyMapMapping and JoinTableMapMapping.
When MapKey annotation is applied, the map field strategy should be
RelationMapTableStrategy as the map key is a field of the entity which is the
map value. However, since the map key is a relation, openjpa wrongly (I
believe) set the strategy as RelationRelationMapTableFieldStrategy. This
strategy is used when the map key is an independent entity. An exception is
therefore thrown out when a MapKey annotation is detected by this strategy.
-Fay
----- Original Message ----
From: Michael Vorburger <[email protected]>
To: [email protected]; [email protected]
Sent: Thursday, April 2, 2009 3:06:01 PM
Subject: RE: 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.
I can open a JIRA, BUT... a few points:
1. Pinaki, you responded to a very similar question for what appears to be a
very similiar domain model (a Map with some Translation (relation) field as
key) that "OpenJPA can map this domain model using @PersistenceMap" on
http://n2.nabble.com/Map%3CClassA,ClassB%3E-problem-td534546.html ... any
advise on how? The link you had provided in that post 404s (and what I think
you probably referred to in the doc doesn't actually have such an example)
2. Fay, I've actually tried this on OpenJPA 1.2.0... what does the error "Use
an inverse key or join table mapping." actually mean, how would one use an
inverse key (to what?).
3. Reg. JPA 2.0, the spec actually says "If the map key type is an entity, the
MapKeyJoinColumn and MapKeyJoinColumns annotations are used to specify the
column mappings for the map key." ... would anybody be able to try my example
as a test on the OpenJPA for JPA 2.0 version?
-----Original Message-----
From: Fay Wang [mailto:[email protected]]
Sent: Thu 4/2/2009 10:05 PM
To: [email protected]
Subject: Re: 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.
It appears that openjpa currently does not support MapKey annotation applied to
a relation field. This, however, is not explicitly stated in the user guide or
JPA 2.0 spec. Please open a JIRA for it. Thanks!
----- Original Message ----
From: Michael Vorburger <[email protected]>
To: [email protected]
Sent: Thursday, April 2, 2009 8:00:28 AM
Subject: 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.
Hello!
Would anybody be able to enlighten us on how to "Use an inverse key or
join table mapping." with a @PersistentMap... I'm encoutering the "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." error
message.
Full test case reproducing this is attached... you'll find three
Entities, a Language, a Translation (with a field of type Language), and
a Something which has a Map<Language, Translation> ... sounds trivial?
;-) -- That 'entity_dict_id' you'll find on the Translation is a kind
of "discriminator" (but not for subclassing, I need to use it to
"classify" the map association - imagine that in real world there is
SomethingElse and many other Entities which are also translated, all
stored in one and the same Translation table.)
I'm sure this is possible, I gathered standard JPA 1.0's @OneToMany with
a @MapKey can not do this, but with a @PersistentMap this should work...
only how?? Any help appreciated...
Thanks a lot,
Michael
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