[rules-users] Problems using shadow proxies and Hibernate lazy initialization

Keith Bennett forthwind at gmail.com
Wed Apr 2 17:53:24 EDT 2008 

I am currently using Drools to validate an extensive object graph.
When I validate a transient object graph (i.e., not persisted via
Hibernate) inside of a JUnit test method, validation occurs
successfully.  However, when I retrieve the same object graph from
Hibernate and subsequently validate it, I get the stack trace that
I've included below, but only when I use shadow proxies.  When I turn
shadow proxies off, validation runs successfully against the persisted
object graph again.  Of course, I'm utilizing lazy association
fetching to improve performance and want to continue utilizing it.
Has anyone run into this same problem, and if so, were you able to
work around it without turning shadow proxies off?  Before you ask, my
Hibernate session is open before and after I invoke Drools to perform
validation in the same unit of work (i.e., transaction), so it's not
an issue of not having an active Hibernate session available (I've
verified this through testing).

One more thing.  The user guide says that if shadow proxies are turned
off that modifyRetract() should be called before an object is modified
and modifyAssert() should be called after it is modifed.  First, what
is the method parameter to these two overloaded methods, Object or
FactHandle (both exist)?  Second, I don't see modifyAssert() available
in the library, just modifyInsert().  Should the documentation change
to read modifyInsert() instead of modifyAssert()?  If so, again with
which parameter?

I appreciate any insight you may have!

Here's the stack trace:

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.initialize(AbstractPersistentCollection.java:343)
	at org.hibernate.collection.PersistentSet.addAll(PersistentSet.java:244)
	at org.drools.util.ShadowProxyUtils.cloneObject(ShadowProxyUtils.java:76)
	at com.cbi.domain.loan.indirect.IndirectLoanShadowProxy.getCustomers(Unknown
Source)
	at org.drools.base.com.cbi.domain.loan.indirect.IndirectLoan28409161$getCustomers.getValue(Unknown
Source)
	at org.drools.base.ClassFieldExtractor.getValue(ClassFieldExtractor.java:127)
	at org.drools.rule.Declaration.getValue(Declaration.java:198)
	at LoanValidationBusinessRules.Rule_A_Loan_must_have_at_least_one_Customer_0Eval0Invoker.evaluate(Rule_A_Loan_must_have_at_least_one_Customer_0Eval0Invoker.java:12)
	at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:72)
	at org.drools.reteoo.EvalConditionNode.assertTuple(EvalConditionNode.java:145)
	at org.drools.reteoo.CompositeTupleSinkAdapter.createAndPropagateAssertTuple(CompositeTupleSinkAdapter.java:73)
	at org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:116)
	at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:318)
	at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:153)
	at org.drools.reteoo.Rete.assertObject(Rete.java:175)
	at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192)
	at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:909)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:881)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:682)
	at com.cbi.service.loan.indirect.impl.DroolsBusinessRulesServiceHelper.executeRules(DroolsBusinessRulesServiceHelper.java:77)
	at com.cbi.service.loan.indirect.impl.DroolsBusinessRulesServiceHelper.validate(DroolsBusinessRulesServiceHelper.java:66)
	at com.cbi.service.loan.indirect.impl.DroolsBusinessRulesServiceImpl.validate(DroolsBusinessRulesServiceImpl.java:97)
	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:585)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at $Proxy4.validate(Unknown Source)
	at com.cbi.service.loan.indirect.impl.IndirectLoanManagementServiceImpl.submitForBooking(IndirectLoanManagementServiceImpl.java:680)
	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:585)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at $Proxy6.submitForBooking(Unknown Source)
	at com.cbi.service.loan.indirect.impl.LoanManagementServiceImplTestCase.testSubmitLoanForBooking(LoanManagementServiceImplTestCase.java:116)
	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:585)
	at junit.framework.TestCase.runTest(TestCase.java:164)
	at junit.framework.TestCase.runBare(TestCase.java:130)
	at org.springframework.test.ConditionalTestCase.runBare(ConditionalTestCase.java:69)
	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 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:585)
	at org.apache.maven.surefire.junit.JUnitTestSet.execute(JUnitTestSet.java:213)
	at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:140)
	at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:127)
	at org.apache.maven.surefire.Surefire.run(Surefire.java:177)
	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:585)
	at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:338)
	at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:997)
2008-04-02 16:48:32,691 ERROR
org.hibernate.LazyInitializationException - 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.readSize(AbstractPersistentCollection.java:97)
	at org.hibernate.collection.PersistentSet.isEmpty(PersistentSet.java:146)
	at LoanValidationBusinessRules.Rule_A_Loan_must_have_at_least_one_Customer_0.eval0(Rule_A_Loan_must_have_at_least_one_Customer_0.java:38)
	at LoanValidationBusinessRules.Rule_A_Loan_must_have_at_least_one_Customer_0Eval0Invoker.evaluate(Rule_A_Loan_must_have_at_least_one_Customer_0Eval0Invoker.java:16)
	at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:72)
	at org.drools.reteoo.EvalConditionNode.assertTuple(EvalConditionNode.java:145)
	at org.drools.reteoo.CompositeTupleSinkAdapter.createAndPropagateAssertTuple(CompositeTupleSinkAdapter.java:73)
	at org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:116)
	at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:318)
	at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:153)
	at org.drools.reteoo.Rete.assertObject(Rete.java:175)
	at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192)
	at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:909)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:881)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:682)
	at com.cbi.service.loan.indirect.impl.DroolsBusinessRulesServiceHelper.executeRules(DroolsBusinessRulesServiceHelper.java:77)
	at com.cbi.service.loan.indirect.impl.DroolsBusinessRulesServiceHelper.validate(DroolsBusinessRulesServiceHelper.java:66)
	at com.cbi.service.loan.indirect.impl.DroolsBusinessRulesServiceImpl.validate(DroolsBusinessRulesServiceImpl.java:97)
	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:585)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at $Proxy4.validate(Unknown Source)
	at com.cbi.service.loan.indirect.impl.IndirectLoanManagementServiceImpl.submitForBooking(IndirectLoanManagementServiceImpl.java:680)
	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:585)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at $Proxy6.submitForBooking(Unknown Source)
	at com.cbi.service.loan.indirect.impl.LoanManagementServiceImplTestCase.testSubmitLoanForBooking(LoanManagementServiceImplTestCase.java:116)
	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:585)
	at junit.framework.TestCase.runTest(TestCase.java:164)
	at junit.framework.TestCase.runBare(TestCase.java:130)
	at org.springframework.test.ConditionalTestCase.runBare(ConditionalTestCase.java:69)
	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 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:585)
	at org.apache.maven.surefire.junit.JUnitTestSet.execute(JUnitTestSet.java:213)
	at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:140)
	at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:127)
	at org.apache.maven.surefire.Surefire.run(Surefire.java:177)
	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:585)
	at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:338)
	at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:997)

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