[rules-users] Re: how to use Array type in Drools
Zeke
xanadu860122 at gmail.com
Tue Apr 28 23:03:01 EDT 2009
Anyone can help me? I want to use an element of an Array in my rule
condition.
Thank you very much!
- Zeke
2009/4/28 Zeke <xanadu860122 at gmail.com>
> Hi,
> I am using Drools 4.0.7 GA. I want to use Array type in my rule
> condition. My drl is like below:
>
>> package org.drools.examples.test;
>>
>> import org.drools.examples.HelloWorldExample.Message;
>>
>> rule "check.array"
>> dialect "java"
>> when
>> m:Message( arr[0] == "1" )
>> then
>> System.out.println( "===check array ok===" );
>> end
>
>
> arr is an int type array. When I run the test case, I meet below
> exception:
>
>> Exception in thread "main" org.drools.RuntimeDroolsException: Exception
>> executing predicate eval( arr[0] == "1" )
>> at
>> org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:216)
>> at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)
>> at
>> org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:22)
>> at
>> org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:162)
>> 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:911)
>> at
>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:883)
>> at
>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:684)
>> at
>> org.drools.examples.HelloWorldExample.main(HelloWorldExample.java:69)
>> Caused by: org.mvel.CompileException: illegal use of []: unknown type: [I
>> at
>> org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getCollectionProperty(ReflectiveAccessorOptimizer.java:482)
>> at
>> org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:274)
>> at
>> org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:110)
>> at org.mvel.ASTNode.getReducedValueAccelerated(ASTNode.java:186)
>> at
>> org.mvel.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:21)
>> at org.mvel.MVELRuntime.execute(MVELRuntime.java:90)
>> at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111)
>> at org.mvel.MVEL.executeExpression(MVEL.java:234)
>> at
>> org.drools.base.mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:45)
>> at
>> org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:209)
>> ... 10 more
>>
>
> Can anyone kindly tell me how to use Array type in Drools? Thanks in
> advance!
>
> - Zeke
>
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