we have a strange problem with the following scenario:

0) we change a lot of stuff in the domain model which results in several inserts and updates to the database

1) we do an (explicit) flush after that
1.1) The ActionQueue processes all "inserts" without problems
1.2) After that the ActionQueue needs to process two "udates"

2) the first update triggers one of our UserTypes which queries the DB via HQL (Session createQuery())

3) This tries to check if a flush is required, (AbstractSessionImpl#getHQLQueryPlan)

4) the code recognizes that _no_ flush is required (DefaultAutoFlushEventListener#onAutoFlush) and tries to clean up the Action queue because (I guess) the check, if a flush is required, might have added entries to the ActionQueue



5) The ActionQueue (The updates collection) is now cleared (ActionQueue#clearFromFlushNeededCheck)

6) Therefore the second Update (from 1.1) is removed and we get an ArrayIndexOutOfBoundsException in
ActionQueue#executeActions

Maybe we are doing something wrong here, but this behaviour appears a bit strange to me. Debugging through Hibernate's source and googling the web / searching the board didn't help me any further.
Hibernate version: 3.1.1

Full stack trace of any exception that occurs:

de.artive.mws.tcore.exception.TechnicalException: Index: 1, Size: 0 [Error code: MWS-1030: "Flushing ist fehlgeschlagen, Transaktion wird zurückgerollt"]
at de.artive.mws.tcore.exception.ExceptionUnwrapper.unwrapMwsException(Unknown Source)
at de.artive.mws.tcore.requestcontext.persistence.PersistenceRequestContext.flush(Unknown Source)
at de.artive.mws.tcore.requestcontext.transaction.TransactionRequestContext.flush(Unknown Source)
at de.artive.manager.baufivorgang.BaufiVorgangsManagerImpl.copyAntragsDatenToVorgangsDaten(BaufiVorgangsManagerImpl.java:460)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
at java.lang.reflect.Method.invoke(Method.java:391)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:292)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:155)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:122)
at de.artive.mws.tcore.intercept.TraceTimeInterceptor.invoke(Unknown Source)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:174)
at $Proxy22.copyAntragsDatenToVorgangsDaten(Unknown Source)
at de.artive.business.scoring.ScoringBusinessServiceImpl.scoreAntrag(ScoringBusinessServiceImpl.java:409)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
at java.lang.reflect.Method.invoke(Method.java:391)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:292)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:155)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:122)
at de.artive.mws.tcore.intercept.TraceTimeInterceptor.invoke(Unknown Source)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:174)
at $Proxy60.scoreAntrag(Unknown Source)
at de.artive.services.baufiantrag.BaufiAntragServiceImpl.scoreAntrag(BaufiAntragServiceImpl.java:107)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
at java.lang.reflect.Method.invoke(Method.java:391)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:292)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:155)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:122)
at de.artive.mws.tcore.security.AccessControlInterceptor.invoke(Unknown Source)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
at de.artive.mws.tcore.alerting.AdminsFriendLoggingInterceptor.invoke(Unknown Source)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
at de.artive.mws.tcore.intercept.TraceTimeInterceptor.invoke(Unknown Source)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:174)
at $Proxy96.scoreAntrag(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
at java.lang.reflect.Method.invoke(Method.java:391)
at de.artive.mws.tcore.intercept.delegate.LocalCallInterceptor.invoke(Unknown Source)
at de.artive.mws.tcore.intercept.DibaMethodInvocation.proceed(Unknown Source)
at de.artive.mws.tcore.intercept.delegate.SerializationSimulationInterceptor.invoke(Unknown Source)
at de.artive.mws.tcore.intercept.DibaMethodInvocation.proceed(Unknown Source)
at de.artive.mws.tcore.intercept.AbstractRequestContextInterceptor.invoke(Unknown Source)
at de.artive.mws.tcore.intercept.DibaMethodInvocation.proceed(Unknown Source)
at de.artive.mws.tcore.intercept.delegate.LogContextInterceptor.invoke(Unknown Source)
at de.artive.mws.tcore.intercept.DibaMethodInvocation.proceed(Unknown Source)
at de.artive.mws.tcore.intercept.ExceptionInterceptor.invoke(Unknown Source)
at de.artive.mws.tcore.intercept.DibaMethodInvocation.proceed(Unknown Source)
at de.artive.mws.tcore.intercept.InterceptorInvocationHandler.invoke(Unknown Source)
at $Proxy120.scoreAntrag(Unknown Source)
at de.artive.services.baufiantrag.BaufiAntragServiceExcelTest.testFullProcess(BaufiAntragServiceExcelTest.java:551)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
at java.lang.reflect.Method.invoke(Method.java:391)
at junit.framework.TestCase.runTest(TestCase.java:154)
at de.artive.mws.bcore.common.DibaTestCase.runTest(DibaTestCase.java:142)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java: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.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:478)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:344)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: java.lang.IndexOutOfBoundsException: Index: 1, Size: 0
at java.util.ArrayList.RangeCheck(ArrayList.java:539)
at java.util.ArrayList.get(ArrayList.java:356)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:227)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:141)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:296)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1007)
at de.artive.mws.tcore.requestcontext.persistence.HibernatePersistenceProvider.flush(Unknown Source)

We were able to find a workaround / solution (?):

We replaced the HQL Query by native SQL over the JDBC Connection (not through Hibernate's session). Thereby circumventing the "isFlushNeeded" check.

Nevertheless it would be helpful if a Hibernate team member wouldn't mind looking into this.