This is very strange. Let me explain the scenario and you can tell me if we have something fundamentally wrong. We have a class (Persister) that receives a lightweight object (VO) to persist, the Persister does the following: 1. Starts a hibernate transaction 2. Creates hibernate pojo's and calls session.save(persister_created_pojo) on each of the pojo's 3. Passes these objects to Drools, which creates more hibernate pojo's and returns them 4. The Persister class then calls session.save(drools_created_pojo) for each of the returned pojo's 5. If no errors exist the transaction is committed, otherwise it is rolled back. When we updated the drules packages from 4.0.0 to 4.0.1 we started getting these errors, it seems like the session gets disconnected the moment we pass the pojo to drools. Maybe someone has some advice or has encountered something similar. Juan From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Mark Proctor Sent: 27 September 2007 04:12 PM To: Rules Users List Cc: juan.heyns(a)epiuse.com Subject: Re: [rules-users] Hibernate 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.throwLazyInitializ ationException(AbstractPersistentCollection.java:358) at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializ ationExceptionIfNotConnected(AbstractPersistentCollection.java:350) at org.hibernate.collection.AbstractPersistentCollection.readElementExisten ce(AbstractPersistentCollection.java:132) at org.hibernate.collection.PersistentSet.contains(PersistentSet.java:153) at org.drools.base.evaluators.ObjectFactory$ObjectContainsEvaluator.evaluat eCachedLeft(ObjectFactory.java:481) at org.drools.rule.VariableRestriction.isAllowedCachedLeft(VariableRestrict ion.java:72) at org.drools.rule.VariableConstraint.isAllowedCachedLeft(VariableConstrain t.java:72) at org.drools.common.SingleBetaConstraints.isAllowedCachedLeft(SingleBetaCo nstraints.java:117) at org.drools.reteoo.JoinNode.assertTuple(JoinNode.java:119) at org.drools.reteoo.CompositeTupleSinkAdapter.createAndPropagateAssertTupl e(CompositeTupleSinkAdapter.java:73) at org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode .java:131) at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleOb jectSinkAdapter.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.jav a:854) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.jav a:826) at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.jav a:60) at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.jav a: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_i s_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_0Conseq uenceInvoker.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(AbstractWorkingMemo ry.java:434) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemo ry.java:396) at com.lonmin.bns.domain.rules.RulesEngine.calculateStopeDrillingBonus(Rule sEngine.java:54) at com.lonmin.bns.domain.model.StopeDrillingCardPersister.processDetail(Sto peDrillingCardPersister.java:371) at com.lonmin.bns.domain.model.StopeDrillingCardPersister.processCard(Stope DrillingCardPersister.java:276) at com.lonmin.bns.domain.model.StopeDrillingCardPersister.process(StopeDril lingCardPersister.java:69) at com.lonmin.bns.domain.model.ValueObjectPersister.persist(ValueObjectPers ister.java:38) at com.lonmin.bns.domain.model.StopeDrillingCardPersisterTest.testEditStope DrillingCard(StopeDrillingCardPersisterTest.java:182) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav a:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.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$1.protect(TestResult.java:106) at junit.framework.TestResult.runProtected(TestResult.java:124) at junit.framework.TestResult.run(TestResult.java:109) at junit.framework.TestCase.run(TestCase.java:120) at junit.framework.TestSuite.runTest(TestSuite.java:230) at junit.framework.TestSuite.run(TestSuite.java:225) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTe stRunner.java:392) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRun ner.java:276) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRu nner.java:167) org.hibernate.LazyInitializationException: failed to lazily initialize a collection, no session or session was closed at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializ ationException(AbstractPersistentCollection.java:358) at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializ ationExceptionIfNotConnected(AbstractPersistentCollection.java:350) at org.hibernate.collection.AbstractPersistentCollection.readElementExisten ce(AbstractPersistentCollection.java:132) at org.hibernate.collection.PersistentSet.contains(PersistentSet.java:153) at org.drools.base.evaluators.ObjectFactory$ObjectContainsEvaluator.evaluat eCachedLeft(ObjectFactory.java:481) at org.drools.rule.VariableRestriction.isAllowedCachedLeft(VariableRestrict ion.java:72) at org.drools.rule.VariableConstraint.isAllowedCachedLeft(VariableConstrain t.java:72) at org.drools.common.SingleBetaConstraints.isAllowedCachedLeft(SingleBetaCo nstraints.java:117) at org.drools.reteoo.JoinNode.assertTuple(JoinNode.java:119) at org.drools.reteoo.CompositeTupleSinkAdapter.createAndPropagateAssertTupl e(CompositeTupleSinkAdapter.java:73) at org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode .java:131) at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleOb jectSinkAdapter.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.jav a:854) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.jav a:826) at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.jav a:60) at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.jav a: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_i s_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_0Conseq uenceInvoker.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(AbstractWorkingMemo ry.java:434) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemo ry.java:396) at com.lonmin.bns.domain.rules.RulesEngine.calculateStopeDrillingBonus(Rule sEngine.java:54) at com.lonmin.bns.domain.model.StopeDrillingCardPersister.processDetail(Sto peDrillingCardPersister.java:371) at com.lonmin.bns.domain.model.StopeDrillingCardPersister.processCard(Stope DrillingCardPersister.java:276) at com.lonmin.bns.domain.model.StopeDrillingCardPersister.process(StopeDril lingCardPersister.java:69) at com.lonmin.bns.domain.model.ValueObjectPersister.persist(ValueObjectPers ister.java:38) at com.lonmin.bns.domain.model.StopeDrillingCardPersisterTest.testEditStope DrillingCard(StopeDrillingCardPersisterTest.java:182) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav a:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.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(RemoteTe stRunner.java:392) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRun ner.java:276) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRu nner.java:167) "Employees of Lonmin Platinum ("Lonplats") are not authorised to conclude electronic transactions or to enter into electronic agreements on behalf of Lonplats. Any electronic signature (other than an advanced electronic signature as defined in the Electronic Communications and Transactions Act of 2003) added to a data message (such as an email or an attachment to an (email) ostensibly on behalf of Lonplats by a Lonplats employee shall not be legally binding on Lonplats and Lonplats shall incur no liability of any nature whatsoever, directly or indirectly, arising from such act on the part of it's employee. It is further recorded that nothing (other than an advanced electronic signature) inserted into any data message emanating from Lonplats shall be construed as constituting an electronic signature" ________________________________ _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users "Employees of Lonmin Platinum ("Lonplats") are not authorised to conclude electronic transactions or to enter into electronic agreements on behalf of Lonplats. Any electronic signature (other than an advanced electronic signature as defined in the Electronic Communications and Transactions Act of 2003) added to a data message (such as an email or an attachment to an (email) ostensibly on behalf of Lonplats by a Lonplats employee shall not be legally binding on Lonplats and Lonplats shall incur no liability of any nature whatsoever, directly or indirectly, arising from such act on the part of it's employee. It is further recorded that nothing (other than an advanced electronic signature) inserted into any data message emanating from Lonplats shall be construed as constituting an electronic signature"

Thanks for the reply... I will give this a go. Has ShadowProxyUtils been introduced in 4.0.1, I didn't get this behavior in 4.0... It is quite imperative that I get this working, since our project depends on Hibernate and Drools. Should we create a JIRA for this? Juan -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Peter Mikula Sent: 29 September 2007 08:55 AM To: Rules Users List Cc: juan.heyns(a)epiuse.com Subject: Re: [rules-users] Hibernate Hi, trouble is in ShadowProxyUtils ... it tries to clone the hibernate collection but in the process looses the hibernate session. I have solved it for myself with a simple patch that disables collection cloning for hibernate collections (if hibernate is on the classpath). Long term solution should probably be some kind of extension point where user can register custom delegate. -- pm "Employees of Lonmin Platinum ("Lonplats") are not authorised to conclude electronic transactions or to enter into electronic agreements on behalf of Lonplats. Any electronic signature (other than an advanced electronic signature as defined in the Electronic Communications and Transactions Act of 2003) added to a data message (such as an email or an attachment to an (email) ostensibly on behalf of Lonplats by a Lonplats employee shall not be legally binding on Lonplats and Lonplats shall incur no liability of any nature whatsoever, directly or indirectly, arising from such act on the part of it's employee. It is further recorded that nothing (other than an advanced electronic signature) inserted into any data message emanating from Lonplats shall be construed as constituting an electronic signature"

Thanks for this. We will probably exclude the PersistentCollection RuleBaseConfiguration conf = new RuleBaseConfiguration(); conf.setShadowProxyExcludes("org.hibernate.collection.PersistentCollecti on"); RuleBase ruleBase = RuleBaseFactory.newRuleBase(conf); to fix our problem, luckily we treat these collections as immutable already. Juan -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Peter Mikula Sent: 01 October 2007 10:37 AM To: Rules Users List Cc: juan.heyns(a)epiuse.com Subject: Re: [rules-users] Hibernate Heyns, Juan wrote: been I was getting the exception for both versions, it happened always when I have iterated over the collection in the "then" part. Beware that you should treat the persistent collections as immutable if you want to use the submitted patch. PS: checking the manual again I have discovered that there were already done some improvements. You can control shadow proxying with drools.shadowProxy = false drools.shadowproxy.exclude = org.domainy.* org.domainx.ClassZ so there is not much use for that patch. -- pm _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users "Employees of Lonmin Platinum ("Lonplats") are not authorised to conclude electronic transactions or to enter into electronic agreements on behalf of Lonplats. Any electronic signature (other than an advanced electronic signature as defined in the Electronic Communications and Transactions Act of 2003) added to a data message (such as an email or an attachment to an (email) ostensibly on behalf of Lonplats by a Lonplats employee shall not be legally binding on Lonplats and Lonplats shall incur no liability of any nature whatsoever, directly or indirectly, arising from such act on the part of it's employee. It is further recorded that nothing (other than an advanced electronic signature) inserted into any data message emanating from Lonplats shall be construed as constituting an electronic signature"