JBRULES-2453, This issue has been closed stating that it got fixed in 5.1.0 CR1. But I got the same issue in 5.1.1, following is the stacktrace of error: Hibernate: select hibernate_sequence.nextval from dual Hibernate: insert into SessionInfo (lastModificationDate, rulesByteArray, startDate, OPTLOCK, id) values (?, ?, ?, ?, ?) Hibernate: select hibernate_sequence.nextval from dual java.lang.RuntimeException: Could not commit session at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:292) at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.startProcess(CommandBasedStatefulKnowledgeSession.java:193) at edu.rascalworkflow.test.LoanRequestTest.startProcess(LoanRequestTest.java:58) at edu.rascalworkflow.test.LoanRequestTest.testRequestLoan(LoanRequestTest.java:48) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74) at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:240) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:180) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Caused by: org.springframework.transaction.TransactionSystemException: Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while committing the transaction at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:476) at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754) at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723) at org.drools.container.spring.beans.persistence.DroolsSpringTransactionManager.commit(DroolsSpringTransactionManager.java:65) at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:281) ... 31 more Caused by: javax.persistence.RollbackException: Error while committing the transaction at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:93) at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:467) ... 35 more Caused by: java.lang.RuntimeException: java.lang.OutOfMemoryError: Java heap space at org.hibernate.ejb.event.BeanCallback.invoke(BeanCallback.java:45) at org.hibernate.ejb.event.EntityCallbackHandler.callback(EntityCallbackHandler.java:94) at org.hibernate.ejb.event.EntityCallbackHandler.preUpdate(EntityCallbackHandler.java:79) at org.hibernate.ejb.event.EJB3FlushEntityEventListener.invokeInterceptor(EJB3FlushEntityEventListener.java:61) at org.hibernate.event.def.DefaultFlushEntityEventListener.handleInterception(DefaultFlushEntityEventListener.java:349) at org.hibernate.event.def.DefaultFlushEntityEventListener.scheduleUpdate(DefaultFlushEntityEventListener.java:287) at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:155) at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:219) at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1206) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:375) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137) at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:76) ... 36 more Caused by: java.lang.OutOfMemoryError: Java heap space at java.util.Arrays.copyOf(Arrays.java:2786) at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:94) at java.io.ObjectOutputStream$BlockDataOutputStream.drain(ObjectOutputStream.java:1847) at java.io.ObjectOutputStream$BlockDataOutputStream.write(ObjectOutputStream.java:1778) at java.io.DataOutputStream.writeInt(DataOutputStream.java:182) at java.io.ObjectOutputStream$BlockDataOutputStream.writeInt(ObjectOutputStream.java:1913) at java.io.ObjectOutputStream.writeInt(ObjectOutputStream.java:777) at org.drools.marshalling.impl.OutputMarshaller.writeLeftTuple(OutputMarshaller.java:482) at org.drools.marshalling.impl.OutputMarshaller.writeLeftTuple(OutputMarshaller.java:466) at org.drools.marshalling.impl.OutputMarshaller.writeInitialFactHandleLeftTuples(OutputMarshaller.java:379) at org.drools.marshalling.impl.OutputMarshaller.writeFactHandles(OutputMarshaller.java:274) at org.drools.marshalling.impl.OutputMarshaller.writeSession(OutputMarshaller.java:102) at org.drools.marshalling.impl.DefaultMarshaller.marshall(DefaultMarshaller.java:133) at org.drools.persistence.session.JPASessionMarshallingHelper.getSnapshot(JPASessionMarshallingHelper.java:72) at org.drools.persistence.session.SessionInfo.update(SessionInfo.java:75) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.hibernate.ejb.event.BeanCallback.invoke(BeanCallback.java:37) at org.hibernate.ejb.event.EntityCallbackHandler.callback(EntityCallbackHandler.java:94) at org.hibernate.ejb.event.EntityCallbackHandler.preUpdate(EntityCallbackHandler.java:79) at org.hibernate.ejb.event.EJB3FlushEntityEventListener.invokeInterceptor(EJB3FlushEntityEventListener.java:61) at org.hibernate.event.def.DefaultFlushEntityEventListener.handleInterception(DefaultFlushEntityEventListener.java:349) at org.hibernate.event.def.DefaultFlushEntityEventListener.scheduleUpdate(DefaultFlushEntityEventListener.java:287) at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:155) at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:219) at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1206) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:375) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137) -drooRam. -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Marshalling-Error-JBR... 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