Drools doesn't handle Hibernate in anyway, we have no awareness of it. The exceptions indicates that you have lazy loading enabled for hibernate, but your session is disconnected when it tries to lazy load the object.

Mark
Heyns, Juan wrote:

Hi,

 

I am getting the following error with 4.0.1, I didn’t get this with 4.0.0… Has anything changed in the way Drools works with Hibernate.

 

Juan

 

15:24:52,281 ERROR LazyInitializationException:19 - failed to lazily initialize a collection, no session or session was closed

org.hibernate.LazyInitializationException: failed to lazily initialize a collection, no session or session was closed

      at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)

      at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)

      at org.hibernate.collection.AbstractPersistentCollection.readElementExistence(AbstractPersistentCollection.java:132)

      at org.hibernate.collection.PersistentSet.contains(PersistentSet.java:153)

      at org.drools.base.evaluators.ObjectFactory$ObjectContainsEvaluator.evaluateCachedLeft(ObjectFactory.java:481)

      at org.drools.rule.VariableRestriction.isAllowedCachedLeft(VariableRestriction.java:72)

      at org.drools.rule.VariableConstraint.isAllowedCachedLeft(VariableConstraint.java:72)

      at org.drools.common.SingleBetaConstraints.isAllowedCachedLeft(SingleBetaConstraints.java:117)

      at org.drools.reteoo.JoinNode.assertTuple(JoinNode.java:119)

      at org.drools.reteoo.CompositeTupleSinkAdapter.createAndPropagateAssertTuple(CompositeTupleSinkAdapter.java:73)

      at org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:131)

      at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:20)

      at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:160)

      at org.drools.reteoo.Rete.assertObject(Rete.java:176)

      at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:196)

      at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:70)

      at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:854)

      at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:826)

      at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:60)

      at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:54)

      at com.lonmin.bns.domain.rules.Rule_Stope_Drilling_work_is_evaluated_based_on_the_holes_drilled_and_blasts_0.consequence(Rule_Stope_Drilling_work_is_evaluated_based_on_the_holes_drilled_and_blasts_0.java:35)

      at com.lonmin.bns.domain.rules.Rule_Stope_Drilling_work_is_evaluated_based_on_the_holes_drilled_and_blasts_0ConsequenceInvoker.evaluate(Rule_Stope_Drilling_work_is_evaluated_based_on_the_holes_drilled_and_blasts_0ConsequenceInvoker.java:22)

      at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)

      at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)

      at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:434)

      at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:396)

      at com.lonmin.bns.domain.rules.RulesEngine.calculateStopeDrillingBonus(RulesEngine.java:54)

      at com.lonmin.bns.domain.model.StopeDrillingCardPersister.processDetail(StopeDrillingCardPersister.java:371)

      at com.lonmin.bns.domain.model.StopeDrillingCardPersister.processCard(StopeDrillingCardPersister.java:276)

      at com.lonmin.bns.domain.model.StopeDrillingCardPersister.process(StopeDrillingCardPersister.java:69)

      at com.lonmin.bns.domain.model.ValueObjectPersister.persist(ValueObjectPersister.java:38)

      at com.lonmin.bns.domain.model.StopeDrillingCardPersisterTest.testEditStopeDrillingCard(StopeDrillingCardPersisterTest.java:182)

      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:324)

      at junit.framework.TestCase.runTest(TestCase.java:164)

      at junit.framework.TestCase.runBare(TestCase.java:130)

      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:120)

      at junit.framework.TestSuite.runTest(TestSuite.java:230)

      at junit.framework.TestSuite.run(TestSuite.java:225)

      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:392)

      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:276)

      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:167)

org.hibernate.LazyInitializationException: failed to lazily initialize a collection, no session or session was closed

      at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)

      at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)

      at org.hibernate.collection.AbstractPersistentCollection.readElementExistence(AbstractPersistentCollection.java:132)

      at org.hibernate.collection.PersistentSet.contains(PersistentSet.java:153)

      at org.drools.base.evaluators.ObjectFactory$ObjectContainsEvaluator.evaluateCachedLeft(ObjectFactory.java:481)

      at org.drools.rule.VariableRestriction.isAllowedCachedLeft(VariableRestriction.java:72)

      at org.drools.rule.VariableConstraint.isAllowedCachedLeft(VariableConstraint.java:72)

      at org.drools.common.SingleBetaConstraints.isAllowedCachedLeft(SingleBetaConstraints.java:117)

      at org.drools.reteoo.JoinNode.assertTuple(JoinNode.java:119)

      at org.drools.reteoo.CompositeTupleSinkAdapter.createAndPropagateAssertTuple(CompositeTupleSinkAdapter.java:73)

      at org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:131)

      at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:20)

      at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:160)

      at org.drools.reteoo.Rete.assertObject(Rete.java:176)

      at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:196)

      at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:70)

      at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:854)

      at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:826)

      at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:60)

      at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:54)

      at com.lonmin.bns.domain.rules.Rule_Stope_Drilling_work_is_evaluated_based_on_the_holes_drilled_and_blasts_0.consequence(Rule_Stope_Drilling_work_is_evaluated_based_on_the_holes_drilled_and_blasts_0.java:35)

      at com.lonmin.bns.domain.rules.Rule_Stope_Drilling_work_is_evaluated_based_on_the_holes_drilled_and_blasts_0ConsequenceInvoker.evaluate(Rule_Stope_Drilling_work_is_evaluated_based_on_the_holes_drilled_and_blasts_0ConsequenceInvoker.java:22)

      at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)

      at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)

      at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:434)

      at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:396)

      at com.lonmin.bns.domain.rules.RulesEngine.calculateStopeDrillingBonus(RulesEngine.java:54)

      at com.lonmin.bns.domain.model.StopeDrillingCardPersister.processDetail(StopeDrillingCardPersister.java:371)

      at com.lonmin.bns.domain.model.StopeDrillingCardPersister.processCard(StopeDrillingCardPersister.java:276)

      at com.lonmin.bns.domain.model.StopeDrillingCardPersister.process(StopeDrillingCardPersister.java:69)

      at com.lonmin.bns.domain.model.ValueObjectPersister.persist(ValueObjectPersister.java:38)

      at com.lonmin.bns.domain.model.StopeDrillingCardPersisterTest.testEditStopeDrillingCard(StopeDrillingCardPersisterTest.java:182)

      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:324)

      at junit.framework.TestCase.runTest(TestCase.java:164)

      at junit.framework.TestCase.runBare(TestCase.java:130)

      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:120)

      at junit.framework.TestSuite.runTest(TestSuite.java:230)

      at junit.framework.TestSuite.run(TestSuite.java:225)

      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:392)

      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:276)

      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:167)

 

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