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Re: [eclipselink-users] NPE in DatabaseCall.translate() when page size is set 
James,

Thanks for your help.

I've written the following code on my startup listener:

	EntityManager em = PersistenceHelper.getEntityManager();
	EntityManagerImpl emi = (EntityManagerImpl) em.getDelegate();
	ServerSession serverSession = emi.getServerSession();
	DatabasePlatform plaf = serverSession.getPlatform();

	((OraclePlatform) plaf).setShouldUseRownumFiltering(false);
	serverSession.getClassDescriptor(org.mypackage.BaseClass.class).getInheritancePolicy()
			.setShouldOuterJoinSubclasses(true);

It resolved NPE problem, however the main issue is still there. When I
count(*) my data in BaseClass entity it returns correct value, however
when I want to get a page of the data, it returns an empty List.

Thanks,
Mohsen.

I've voted for the bug.

On Mon, Aug 11, 2008 at 6:13 PM, James Sutherland <jamesssss@xxxxxxxxx> wrote:
>
> Seems to be a bug with maxResults and inheritance.  This bug has already been
> logged see,
>
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=237743
>
> Please vote for the bug.
>
> As a wrokaround you can remove the maxResults, or call
> setShouldUseRownumFiltering(false) on your OraclePlatform.
>
> You could also set inheritance to be loaded through an outerjoin, which is
> probably the best solution anyway if you want to set a maxResults.  There is
> an InhertiancePolicy and query option setShouldOuterJoinSubclasses(true)
> that will configure this.  There is no annotation or query hint yet for
> this, so you may wish to log a bug for that.
>
>
>
>
> Mohsen Saboorian wrote:
>>
>> Hi,
>>
>> I have a base class (@Inheritance(strategy = InheritanceType.JOINED))
>> with a number of subclasses, all with string discriminator values.
>> When I rung the following query, I'm giving NPE exception: SELECT be
>> FROM BaseEntity be
>>
>> If I do not set q.setFirstResult(0).setMaxResults(x) (x can be any
>> number > 0, even if the size is more than query result), it works
>> good, but as I set some maxResults, it throws the following exception.
>>
>> [EL Warning]: 2008.08.09
>> 09:06:16.315--UnitOfWork(10250203)--java.lang.NullPointerException
>> java.lang.NullPointerException
>>       at
>> org.eclipse.persistence.internal.databaseaccess.DatabaseCall.translate(DatabaseCall.java:925)
>>       at
>> org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:203)
>>       at
>> org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:190)
>>       at
>> org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeSelectCall(DatasourceCallQueryMechanism.java:261)
>>       at
>> org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.selectAllRows(DatasourceCallQueryMechanism.java:594)
>>       at
>> org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRowsFromConcreteTable(ExpressionQueryMechanism.java:2496)
>>       at
>> org.eclipse.persistence.descriptors.InheritancePolicy.selectAllRowUsingDefaultMultipleTableSubclassRead(InheritancePolicy.java:1265)
>>       at
>> org.eclipse.persistence.descriptors.InheritancePolicy.selectAllRowUsingMultipleTableSubclassRead(InheritancePolicy.java:1299)
>>       at
>> org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRows(ExpressionQueryMechanism.java:2461)
>>       at
>> org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:478)
>>       at
>> org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:883)
>>       at
>> org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:666)
>>       at
>> org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:844)
>>       at
>> org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:456)
>>       at
>> org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:906)
>>       at
>> org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2588)
>>       at
>> org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1178)
>>       at
>> org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1162)
>>       at
>> org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1136)
>>       at
>> org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1118)
>>       at
>> org.eclipse.persistence.internal.jpa.EJBQueryImpl.executeReadQuery(EJBQueryImpl.java:399)
>>       at
>> org.eclipse.persistence.internal.jpa.EJBQueryImpl.getResultList(EJBQueryImpl.java:517)
>>
>>
>> Thanks,
>> Mohsen.
>>
>
>
> -----
> ---
> http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland
> http://www.eclipse.org/eclipselink/
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