[rules-users] error on retracting fact on drools 5.0.1

Thu Jan 21 18:38:59 EST 2010

I have a rule and it is supposed to retract two objects

when

    $objectOne : ObjectOne(...)
    $objectTwo : ObjectTwo(...)

then

	retract($objectOne);
	#retract($objectTwo); 

end

No matter what I do I can't ever retract objectTwo.

I put a print statement and it is there.

If I comment out the retraction of objectTwo it works fine.
I tried just retraction of objectTwo and that fails too.
I tried prefixing with drools.retract.

I get this:

com.principal.health.rules.RulesException: Root exception: [Error: drools.retract($objectTwo): null]
[Near : {... Unknown ....}]
             ^
[Line: 1, Column: 0] - [Error: drools.retract($objectTwo): null]
[Near : {... Unknown ....}]
             ^
[Line: 1, Column: 0]
	at com.principal.health.rules.impl.DroolsRuleSetImpl.fireRuleflow(DroolsRuleSetImpl.java:100)
	at com.principal.health.rules.RulesTestCase.executeRules(RulesTestCase.java:247)
	at com.principal.health.rules.RulesTestCase.executeAvailableRules(RulesTestCase.java:129)
	at com.principal.health.rules.impl.available.MemberNetworkXFormRulesRuleId6Test.retractMemberNetworkContractWithNullTeminationDates(MemberNetworkXFormRulesRuleId6Test.java:235)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:618)
	at org.junit.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99)
	at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81)
	at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
	at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75)
	at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45)
	at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:71)
	at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35)
	at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42)
	at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
	at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: org.drools.runtime.rule.ConsequenceException: [Error: drools.retract($wrappedNetwork): null]
[Near : {... Unknown ....}]
             ^
[Line: 1, Column: 0]
	at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23)
	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:943)
	at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:885)
	at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1086)
	at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:660)
	at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:627)
	at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:183)
	at com.principal.health.rules.impl.DroolsRuleSetImpl.fireRuleflow(DroolsRuleSetImpl.java:91)
	... 23 more
Caused by: [Error: drools.retract($wrappedNetwork): null]
[Near : {... Unknown ....}]
             ^
[Line: 1, Column: 0]
	at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:374)
	at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:138)
	at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:133)
	at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
	at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:104)
	at org.mvel2.MVEL.executeExpression(MVEL.java:978)
	at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:87)
	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:934)
	... 29 more
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:618)
	at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:931)
	at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:316)
	... 36 more
Caused by: java.lang.AssertionError: null
	at org.junit.Assert.fail(Assert.java:69)
	at org.junit.Assert.assertTrue(Assert.java:32)
	at org.junit.Assert.assertTrue(Assert.java:41)
	at com.principal.health.rules.impl.available.MemberNetworkXFormRulesRuleId6Test$2.objectRetracted(MemberNetworkXFormRulesRuleId6Test.java:221)
	at org.drools.impl.StatefulKnowledgeSessionImpl$WorkingMemoryEventListenerWrapper.objectRetracted(StatefulKnowledgeSessionImpl.java:501)
	at org.drools.event.WorkingMemoryEventSupport.fireObjectRetracted(WorkingMemoryEventSupport.java:89)
	at org.drools.common.AbstractWorkingMemory.retract(AbstractWorkingMemory.java:1186)
	at org.drools.base.DefaultKnowledgeHelper.retract(DefaultKnowledgeHelper.java:158)
	at org.drools.base.DefaultKnowledgeHelper.retract(DefaultKnowledgeHelper.java:172)
	... 42 more

SDG

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