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icon8.gif  NullPointerException on Eclipselink LAZY loading [message #1753405] Sun, 05 February 2017 23:42 Go to next message
Eclipse UserFriend
Eclipselink LAZY loading is throwing the following exception for getter method call, not sure what is the root cause and how to solve this problem.




ABC POJO class

@OneToMany(mappedBy = "owner", fetch = FetchType.LAZY)
private List<EffectiveData> effectiveData;



ABCProcessor.java
List<EffectiveData> enrollmentEffectiveDataList = enrollment.getEffectiveData(); //FIXME issue with LAZY loading.
if (CollectionUtils.isEmpty(enrollmentEffectiveDataList))
{
throw new JobExecutionException("Error .....................");
}

We are getting NullPointerException irrespective of if condition (removed if condition and tested still getting NPE)

What circumstance we will get the NPE for LAZY loading and please suggest ?



[EL Warning]: 2017-02-03 16:59:18.885--UnitOfWork(1000024707)--java.lang.NullPointerException
at org.eclipse.persistence.internal.sessions.AbstractSession.executeDeferredEvents(AbstractSession.java:1454)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2897)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1804)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1786)
at org.eclipse.persistence.internal.indirection.NoIndirectionPolicy.valueFromQuery(NoIndirectionPolicy.java:326)
at org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRowInternal(ForeignReferenceMapping.java:2294)
at org.eclipse.persistence.mappings.OneToOneMapping.valueFromRowInternal(OneToOneMapping.java:1860)
at org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRow(ForeignReferenceMapping.java:2144)
at org.eclipse.persistence.mappings.ForeignReferenceMapping.buildCloneFromRow(ForeignReferenceMapping.java:336)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildAttributesIntoWorkingCopyClone(ObjectBuilder.java:1996)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildWorkingCopyCloneFromRow(ObjectBuilder.java:2249)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObjectInUnitOfWork(ObjectBuilder.java:847)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:734)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:688)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:795)
at org.eclipse.persistence.queries.ReadAllQuery.registerResultInUnitOfWork(ReadAllQuery.java:890)
at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:509)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1168)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:899)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1127)
at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:403)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1215)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2896)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1804)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1786)
at org.eclipse.persistence.internal.indirection.QueryBasedValueHolder.instantiate(QueryBasedValueHolder.java:129)
at org.eclipse.persistence.internal.indirection.QueryBasedValueHolder.instantiate(QueryBasedValueHolder.java:116)
at org.eclipse.persistence.internal.indirection.DatabaseValueHolder.getValue(DatabaseValueHolder.java:89)
at org.eclipse.persistence.internal.indirection.UnitOfWorkValueHolder.instantiateImpl(UnitOfWorkValueHolder.java:173)
at org.eclipse.persistence.internal.indirection.UnitOfWorkValueHolder.instantiate(UnitOfWorkValueHolder.java:234)
at org.eclipse.persistence.internal.indirection.DatabaseValueHolder.getValue(DatabaseValueHolder.java:89)
at org.eclipse.persistence.indirection.IndirectList.buildDelegate(IndirectList.java:252)
at org.eclipse.persistence.indirection.IndirectList.getDelegate(IndirectList.java:423)
at org.eclipse.persistence.indirection.IndirectList.isEmpty(IndirectList.java:498)
at org.apache.commons.collections.CollectionUtils.isEmpty(CollectionUtils.java:979)
at com.ABCProcessor.process(ABCProcessor.java:60)
at com.ABCProcessor.process(ABCProcessor.java:42)
at sun.reflect.GeneratedMethodAccessor150.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:319)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at com.sun.proxy.$Proxy200.process(Unknown Source)
at org.springframework.batch.core.step.item.SimpleChunkProcessor.doProcess(SimpleChunkProcessor.java:126)
at org.springframework.batch.core.step.item.FaultTolerantChunkProcessor$1.doWithRetry(FaultTolerantChunkProcessor.java:225)
at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:263)
at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:193)
at org.springframework.batch.core.step.item.BatchRetryTemplate.execute(BatchRetryTemplate.java:217)
at org.springframework.batch.core.step.item.FaultTolerantChunkProcessor.transform(FaultTolerantChunkProcessor.java:290)
at org.springframework.batch.core.step.item.SimpleChunkProcessor.process(SimpleChunkProcessor.java:192)
at org.springframework.batch.core.step.item.ChunkOrientedTasklet.execute(ChunkOrientedTasklet.java:75)
at org.springframework.batch.core.step.tasklet.TaskletStep$ChunkTransactionCallback.doInTransaction(TaskletStep.java:406)
at org.springframework.batch.core.step.tasklet.TaskletStep$ChunkTransactionCallback.doInTransaction(TaskletStep.java:330)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)
at org.springframework.batch.core.step.tasklet.TaskletStep$2.doInChunkContext(TaskletStep.java:271)
at org.springframework.batch.core.scope.context.StepContextRepeatCallback.doInIteration(StepContextRepeatCallback.java:81)
at org.springframework.batch.repeat.support.TaskExecutorRepeatTemplate$ExecutingRunnable.run(TaskExecutorRepeatTemplate.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)

[Updated on: Tue, 07 February 2017 15:02] by Moderator

Re: NullPointerException on Eclipselink LAZY loading [message #1753575 is a reply to message #1753405] Tue, 07 February 2017 14:29 Go to previous messageGo to next message
Eclipse UserFriend
The stack trace shows it isn't a problem with the mapping, but is occurring when building the referenced entity. The referenced entity has a OneToOneMapping type mapping that is eagerly fetched, and this is causing an issue somehow. Please show the referenced descriptor, and maybe try the latest EclipseLink version if possible
Re: NullPointerException on Eclipselink LAZY loading [message #1753576 is a reply to message #1753575] Tue, 07 February 2017 15:03 Go to previous messageGo to next message
Eclipse UserFriend
I have updated the message, please let me know if it is not providing the complete information.
Re: NullPointerException on Eclipselink LAZY loading [message #1753577 is a reply to message #1753576] Tue, 07 February 2017 15:06 Go to previous messageGo to next message
Eclipse UserFriend
We don't want to use EAGER fetch type, we would like to know how to solve the problem for LAZY loading and the root cause for this NPE.
Re: NullPointerException on Eclipselink LAZY loading [message #1753680 is a reply to message #1753577] Wed, 08 February 2017 13:05 Go to previous message
Eclipse UserFriend
The point is that you ARE using eager on a relationship. In this case, it seems you have a lazy relationship between Class A and Class B. When this relationship is triggered, an instance of class B is being built - doing so causes relationship to Class C to be fetched as it is an Eager 1:1 type mapping. This class C must have some event processing that is causing or related to the issue you see. Class B seems to be EffectiveData, but without this class, but we need to see it and what ever Class C is to help debug the problem.

I can't help with what is happening without more information. This is also a duplicate of https://www.eclipse.org/forums/index.php/t/1084183/ - I suggest you close one
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