Hi,
I found out I had this king of errors when I was using nested accessors like :

Number () from accumulate (

$person : Person(

age > 18,

dog.weight > 50

),
sum($person)

)

I found I could get rid of these this way :

Number () from accumulate (

$person : Person(

age > 18

)&& eval($person.getDog().getWeight()>50),
sum($person)

)

I guess it is not optimized at all, but at least it does not raise strange exception.
Chris

2008/4/25 Christine <christine@christine.nl>:

Hi,
does anyone know what this error means?
It happens when I put an enum constant in a rule. I use the same enum
constant in another part of the same rule with no problem.

Christine

org.drools.RuntimeDroolsException: Exception executing predicate
org.drools.base.mvel.MVELPredicateExpression@125844f
       at
org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:216)
       at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:132)
       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
nl.ing.towardsdeepdrive.rules.SalesRules.assertCompetitorProduct(SalesRules.java:42)
       at rules.SalesRulesTest.TestRules(SalesRulesTest.java:53)
       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.junit.internal.runners.TestMethod.invoke(TestMethod.java:59)
       at
org.junit.internal.runners.MethodRoadie.runTestMethod(MethodRoadie.java:98)
       at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:79)
       at
org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:87)
       at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:77)
       at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:42)
       at
org.junit.internal.runners.JUnit4ClassRunner.invokeTestMethod(JUnit4ClassRunner.java:88)
       at
org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
       at
org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
       at
org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)
       at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)
       at
org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
       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.mvel.CompileException: cannot invoke getter: getType
[declr.class: nl.ing.towardsdeepdrive.data.model.Product; act.class: null]
       at
org.mvel.optimizers.impl.refl.GetterAccessor.getValue(GetterAccessor.java:52)
       at
org.mvel.optimizers.impl.refl.VariableAccessor.getValue(VariableAccessor.java:39)
       at
org.mvel.ast.VariableDeepPropertyNode.getReducedValueAccelerated(VariableDeepPropertyNode.java:22)
       at
org.mvel.ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.java:21)
       at
org.mvel.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:21)
       at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
       at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111)
       at org.mvel.MVEL.executeExpression(MVEL.java:235)
       at
org.drools.base.mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:36)
       at
org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:210)
       ... 33 more
Caused by: java.lang.NullPointerException
       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.mvel.optimizers.impl.refl.GetterAccessor.getValue(GetterAccessor.java:42)
       ... 42 more



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