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https://issues.apache.org/jira/browse/JDO-630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12799281#action_12799281
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Craig Russell commented on JDO-630:
-----------------------------------
Not clear what you are looking for. The stack trace is above:
[java] There was 1 error:
[java] 1)
testAbstractSuperclassExact(org.apache.jdo.tck.api.persistencemanager.getobject.GetObjectByIdExactClass)java.lang.NullPointerException
[java] at
org.datanucleus.state.JDOStateManagerImpl.cache(JDOStateManagerImpl.java:659)
[java] at
org.datanucleus.ObjectManagerImpl.putObjectIntoLevel2CacheInternal(ObjectManagerImpl.java:3916)
[java] at
org.datanucleus.ObjectManagerImpl.putObjectIntoLevel2Cache(ObjectManagerImpl.java:3893)
[java] at
org.datanucleus.ObjectManagerImpl.findObject(ObjectManagerImpl.java:2821)
[java] at
org.datanucleus.jdo.JDOPersistenceManager.getObjectById(JDOPersistenceManager.java:1640)
[java] at
org.apache.jdo.tck.api.persistencemanager.getobject.GetObjectByIdExactClass.testAbstractSuperclassExact(GetObjectByIdExactClass.java:109)
> Support specification of exact class in SingleFieldIdentity
> -----------------------------------------------------------
>
> Key: JDO-630
> URL: https://issues.apache.org/jira/browse/JDO-630
> Project: JDO
> Issue Type: Improvement
> Components: specification, tck2
> Reporter: Andy Jefferson
> Assignee: Craig Russell
> Fix For: JDO 2 maintenance release 3
>
> Attachments: jdo-630.patch
>
>
> When calling PersistenceManager.getObjectById() with a SingleFieldIdentity,
> there seems to be no way of avoiding the following
> (if the implementation decides to do so):
> "It is an implementation decision whether to access the data store, if
> required to determine the exact class. This will be the case of inheritance,
> where multiple <code>PersistenceCapable</code> classes share the same
> ObjectId class."
> Now when I know for sure that the targetClassName of the given
> SingleFieldIdentity already denotes the correct class for the given id, how
> can I avoid that additional roundtrip to the database for finding the exact
> class?
> It would be useful to have a way of specifying a SingleFieldIdentity to be
> for the exact class specified. This could be done by addition of methods
> void setExact(boolean flag);
> boolean getExact();
> to SingleFieldIdentity
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