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From "Ekin Sokmen (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-333) ManyToMany relationship not handled properly while using DataCache.
Date Fri, 24 Aug 2007 12:17:31 GMT
ManyToMany relationship not handled properly while using DataCache.
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                 Key: OPENJPA-333
                 URL: https://issues.apache.org/jira/browse/OPENJPA-333
             Project: OpenJPA
          Issue Type: Bug
          Components: datacache
    Affects Versions: 1.0.0
         Environment: Linux Fedora 6 2.6.22.1-32.fc6
Java SE 1.5.0_11
            Reporter: Ekin Sokmen
             Fix For: 0.9.0


We are implementing WS-methods using POJOs and OpenJPA. Following description is a simplified
model of the issue we are facing. There is also a test case attached which demonstrates the
described problem.

Assume that we have 2 entities EntityA and EntityB in ManyToMany relationship. We are going
to create a new instance of EntityA and add an existing instance of EntityB to it. We are
creating a new POJO instance of EntityA and add a fully populated offline instance of EntityB
to it. This instance of EntityA is serialized and sent to the server where we are just doing
"persist" on this entity. Without DataCache this is working fine. 

If we enable DataCache and create a new instance of EntityA as described above the entity
is persisted successfully but if we retrieve the instance using OpenJPA we get the instance
of EntityA but the list of EntityB is not populated properly, which means we have a set of
EntityB which is not null and the size is >0 but the content is just null.

As a hint: if we debug the code we end up just after commit of new instance where the cache
is updated. The enhanced method "pcFetchObjectId" of EntityB is called but the EntityB is
a detached object so it returns null and the list of EntityB in EntityA consists of a list
of nulls. 


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