Problems with Hibernate in milestone 3 and toString in model objects

[geira]

I am using the RepeatOperationsStepConfiguration and RepeatOperationsStepConfiguration together with Hibernate with my own implementation updating a resultset with Hibernate.

When I override the toString in the Hibernate model classes, - the process failes with the stackstrace enclosed below.

I seems to fail with:
org.springframework.batch.repeat.context.Synchroni zedAttributeAccessor.toString(SynchronizedAttribut eAccessor.java:151)

Probably caused due to the Hibernate configuration which have configured the objects to be lazily loaded.

How could I get around this?

When I remove my own toString override, - it works....

Geir



2007-12-31 13:47:57,278 [DEBUG ] [main ] org.springframework.batch.repeat.support.RepeatTem plate - Exception intercepted (1 of 1)
org.hibernate.SessionException: proxies cannot be fetched by a stateless session
at org.hibernate.impl.StatelessSessionImpl.immediateL oad(StatelessSessionImpl.java:220)
at org.hibernate.proxy.AbstractLazyInitializer.initia lize(AbstractLazyInitializer.java:66)
at org.hibernate.proxy.AbstractLazyInitializer.getImp lementation(AbstractLazyInitializer.java:111)
at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitialize r.invoke(CGLIBLazyInitializer.java:150)
at no.aftenposten.accountbalancer.core.model.GeneralL edgerBean$$EnhancerByCGLIB$$da6cb6b.toString(<gene rated>)
at java.lang.String.valueOf(String.java:2615)
at java.lang.StringBuffer.append(StringBuffer.java:22 0)
at org.apache.commons.lang.builder.ToStringStyle.appe ndDetail(ToStringStyle.java:545)
at org.apache.commons.lang.builder.ToStringStyle.appe ndInternal(ToStringStyle.java:509)
at org.apache.commons.lang.builder.ToStringStyle.appe nd(ToStringStyle.java:395)
at org.apache.commons.lang.builder.ToStringBuilder.ap pend(ToStringBuilder.java:840)
at org.apache.commons.lang.builder.ReflectionToString Builder.appendFieldsIn(ReflectionToStringBuilder.j ava:605)
at org.apache.commons.lang.builder.ReflectionToString Builder.toString(ReflectionToStringBuilder.java:75 8)
at org.apache.commons.lang.builder.ReflectionToString Builder.toString(ReflectionToStringBuilder.java:28 6)
at org.apache.commons.lang.builder.ReflectionToString Builder.toString(ReflectionToStringBuilder.java:12 0)
at org.apache.commons.lang.builder.ToStringBuilder.re flectionToString(ToStringBuilder.java:126)
at no.aftenposten.accountbalancer.core.model.Abstract BaseBean.toString(AbstractBaseBean.java:41)
at java.lang.String.valueOf(String.java:2615)
at java.lang.StringBuffer.append(StringBuffer.java:22 0)
at org.springframework.batch.repeat.context.Synchroni zedAttributeAccessor.toString(SynchronizedAttribut eAccessor.java:151)
at java.lang.String.valueOf(String.java:2615)
at java.lang.StringBuffer.append(StringBuffer.java:22 0)
at org.springframework.transaction.support.Transactio nSynchronizationManager.getResource(TransactionSyn chronizationManager.java:140)
at org.springframework.batch.io.support.HibernateAwar eItemWriter.getProcessed(HibernateAwareItemWriter. java:230)
at org.springframework.batch.io.support.HibernateAwar eItemWriter.write(HibernateAwareItemWriter.java:12 1)
at no.aftenposten.accountbalancer.batch.processor.Sub scriptionLineActivateProcessor.process(Subscriptio nLineActivateProcessor.java:38)
at org.springframework.batch.execution.tasklet.ItemPr oviderProcessTasklet.execute(ItemProviderProcessTa sklet.java:149)
at org.springframework.batch.execution.step.simple.Si mpleStepExecutor.doTaskletProcessing(SimpleStepExe cutor.java:372)
at org.springframework.batch.execution.step.simple.De faultStepExecutor.doTaskletProcessing(DefaultStepE xecutor.java:61)
at org.springframework.batch.execution.step.simple.Si mpleStepExecutor$2.doInIteration(SimpleStepExecuto r.java:347)
at org.springframework.batch.repeat.support.RepeatTem plate.getNextResult(RepeatTemplate.java:324)
at org.springframework.batch.repeat.support.RepeatTem plate.executeInternal(RepeatTemplate.java:201)
at org.springframework.batch.repeat.support.RepeatTem plate.iterate(RepeatTemplate.java:131)
at org.springframework.batch.execution.step.simple.Si mpleStepExecutor.processChunk(SimpleStepExecutor.j ava:334)
at org.springframework.batch.execution.step.simple.Si mpleStepExecutor$1$2.doInTransaction(SimpleStepExe cutor.java:220)
at org.springframework.transaction.support.Transactio nTemplate.execute(TransactionTemplate.java:128)
at org.springframework.batch.execution.step.simple.Si mpleStepExecutor$1.doInIteration(SimpleStepExecuto r.java:208)
at org.springframework.batch.repeat.support.RepeatTem plate.getNextResult(RepeatTemplate.java:324)
at org.springframework.batch.repeat.support.RepeatTem plate.executeInternal(RepeatTemplate.java:201)
at org.springframework.batch.repeat.support.RepeatTem plate.iterate(RepeatTemplate.java:131)
at org.springframework.batch.execution.step.simple.Si mpleStepExecutor.process(SimpleStepExecutor.java:1 85)
at org.springframework.batch.execution.job.DefaultJob Executor.run(DefaultJobExecutor.java:97)
at org.springframework.batch.execution.launch.SimpleJ obExecutorFacade.start(SimpleJobExecutorFacade.jav a:199)
at org.springframework.batch.execution.launch.SimpleJ obLauncher.runInternal(SimpleJobLauncher.java:248)
at org.springframework.batch.execution.launch.SimpleJ obLauncher$1.run(SimpleJobLauncher.java:292)
at org.springframework.core.task.SyncTaskExecutor.exe cute(SyncTaskExecutor.java:49)
at org.springframework.batch.execution.launch.SimpleJ obLauncher.run(SimpleJobLauncher.java:280)
at no.aftenposten.accountbalancer.batch.tasklet.Abstr actBatchLauncherTests.testLaunchJob(AbstractBatchL auncherTests.java:84)
at no.aftenposten.accountbalancer.batch.tasklet.Abstr actValidatingBatchLauncherTests.testLaunchJob(Abst ractValidatingBatchLauncherTests.java:32)
at no.aftenposten.accountbalancer.batch.tasklet.Subsc riptionLineJobTest.testLaunchJob(SubscriptionLineJ obTest.java:47)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at junit.framework.TestCase.runTest(TestCase.java:154 )
at junit.framework.TestCase.runBare(TestCase.java:127 )
at org.springframework.test.ConditionalTestCase.runBa re(ConditionalTestCase.java:69)
at junit.framework.TestResult$1.protect(TestResult.ja va:106)
at junit.framework.TestResult.runProtected(TestResult .java:124)
at junit.framework.TestResult.run(TestResult.java:109 )
at junit.framework.TestCase.run(TestCase.java:118)
at junit.textui.TestRunner.doRun(TestRunner.java:116)
at com.intellij.rt.execution.junit.IdeaTestRunner.doR un(IdeaTestRunner.java:65)
at junit.textui.TestRunner.doRun(TestRunner.java:109)
at com.intellij.rt.execution.junit.IdeaTestRunner.sta rtRunnerWithArgs(IdeaTestRunner.java:24)
at com.intellij.rt.execution.junit.JUnitStarter.prepa reStreamsAndStart(JUnitStarter.java:118)
at com.intellij.rt.execution.junit.JUnitStarter.main( JUnitStarter.java:40)
2007-12-31 13:47:57,313 [DEBUG ] [main ] org.springframework.batch.repeat.support.RepeatTem plate - Batch is complete according to policy and result value.
2007-12-31 13:47:57,314 [DEBUG ] [main ] org.springframework.orm.hibernate3.SessionFactoryU tils - Opening Hibernate Session
2007-12-31 13:47:57,315 [DEBUG ] [main ] org.hibernate.impl.SessionImpl - opened session at timestamp: 4911535215882240

[Dave Syer]

It looks like your toString() is probably bad for your health generally, so if I were you I would re-write it to not depend on lazy-loaded properties. Otherwise you will get this kind of error anywhere when toString() is called on a detached object.

If you really need the fragility that comes with your lazy-loaded toString() then you might try using a stateful session (it looks from the stack trace like you are using a stateless session - which takes away some of the HibernateItemWriter benefits already).