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https://issues.apache.org/jira/browse/OPENJPA-1004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12693940#action_12693940
]
Fay Wang commented on OPENJPA-1004:
-----------------------------------
The PCEnhancer generates pcCopyKeyFieldsToObjectId as following:
public void pcCopyKeyFieldsToObjectId(Object paramObject)
{
Object localObject;
ChildId localChildId = (ChildId)((ObjectId)paramObject).getId();
localChildId.id = this.id;
Parent localParent = this.parent;
if (localParent != null)
localObject = ((PersistenceCapable)localParent).pcFetchObjectId();
localChildId.parent = ((localObject != null) ?
((LongId)localObject).getId() : 0L);
}
Since the parent has generated key, its objectId is null during pre-flush
stage, the parent.pcFetchObjectId will throw the exception:
<openjpa-1.2.1-r752877:753278 fatal user error>
org.apache.openjpa.persistence.InvalidStateException: Detected reentrant flush.
Make sure your flush-time instance callback methods or event listeners do not
invoke any operations that require the in-progress flush to complete.
at org.apache.openjpa.kernel.BrokerImpl.flushSafe(BrokerImpl.java:1904)
at org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:1679)
at
org.apache.openjpa.kernel.StateManagerImpl.assignObjectId(StateManagerImpl.java:524)
at
org.apache.openjpa.kernel.StateManagerImpl.assignObjectId(StateManagerImpl.java:506)
at
org.apache.openjpa.kernel.StateManagerImpl.fetchObjectId(StateManagerImpl.java:1434)
at net.company.persistence.Parent.pcFetchObjectId(Parent.java)
at net.company.persistence.Child.pcCopyKeyFieldsToObjectId(Child.java)
The proposed fix is to have PCEnhancer generate the following code when parent
has generated key:
public void pcCopyKeyFieldsToObjectId(Object paramObject)
{
ChildId localChildId = (ChildId)((ObjectId)paramObject).getId();
localChildId.id = this.id;
localChildId.parent = 0L;
}
The test case then passed.
> Derived Identity fails when parent id is auto-generated
> -------------------------------------------------------
>
> Key: OPENJPA-1004
> URL: https://issues.apache.org/jira/browse/OPENJPA-1004
> Project: OpenJPA
> Issue Type: Bug
> Affects Versions: 1.2.2, 2.0.0
> Reporter: Fay Wang
>
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