[rules-users] mvel error?

Fri Apr 25 09:10:53 EDT 2008

Your right I ment count() :D
I have not tryed 4.0.7
The thing is last update I made with from 4.0.3 to 4.0.6 made my
Drools-sceptic co-workers even more sceptic (see in previous mails). So
we'll stick to 4.0.3, but if I have time too, I am going to test my Rules on
it. When is the release planned?
Chris

2008/4/25 Edson Tirelli <tirelli at post.com>:

>
>    I don't know what sum( $person ) means, :) but nested accessors
> definitively should work:
>
> Number () from accumulate (
> $person : Person(
> age > 18,
> dog.weight > 50
> ),
> sum($person)
> )
>
>     In Cristine's case, a NPE is being raised:
>
> Caused by: java.lang.NullPointerException
>
>    Did you guys tried 4.0.7, that is about to be released? Does the error
> still happens there?
>
>    []s
>    Edson
>
>
>
> 2008/4/25 Chris Woodrow <woodrow.chris at gmail.com>:
>
> 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 at 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 at 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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>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>
>>
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>>
>>
>
>
> --
> Edson Tirelli
> JBoss Drools Core Development
> Office: +55 11 3529-6000
> Mobile: +55 11 9287-5646
> JBoss, a division of Red Hat @ www.jboss.com
> _______________________________________________
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>
>
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