Skip to main content

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [List Home]
Re: [eclipselink-users] NPE in DatabaseCall.translate() when page size is set

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/
 EclipseLink ,  http://www.oracle.com/technology/products/ias/toplink/
TopLink 
Wiki:  http://wiki.eclipse.org/EclipseLink EclipseLink , 
http://wiki.oracle.com/page/TopLink TopLink 
Forums:  http://forums.oracle.com/forums/forum.jspa?forumID=48 TopLink , 
http://www.nabble.com/EclipseLink-f26430.html EclipseLink 
Book:  http://en.wikibooks.org/wiki/Java_Persistence Java Persistence 
-- 
View this message in context: http://www.nabble.com/NPE-in-DatabaseCall.translate%28%29-when-page-size-is-set-tp18902453p18927219.html
Sent from the EclipseLink - Users mailing list archive at Nabble.com.



Back to the top