[rules-users] how to use Array type in Drools

[Zeke]

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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