[rules-users] MVEL error (was: 3.1 M Help Needed)

[Edson Tirelli]

   Mark,

   What is the status on MVEL stuff used in core?

   []s
   Edson

2007/4/6, vista2007 <my_vista2007 at yahoo.com>:
>
>
> I implement the following logic using 3.1M edition,
>
> package com.software.warehouse.rules.impl;
>
> #list any import classes here.
> import com.software.warehouse.model.Item;
> import com.software.warehouse.model.ItemCollect;
>
>
> #declare any global variables here
>
> global com.software.warehouse.model.ItemCollect itemCollect;
>
> rule "Rule 1"
>
> salience 20
>         when
>                 # itemCollect.getItemList() method returns a List of
> objects
>
>                              m : Item(status == Item.ACTIVE) from
> itemCollect.getItemList()
>
>         then
>                 m.setStatus(Item.INACTIVE);
>                 System.out.println(m.getStatus());
>         end
>
>
> It gave me the followin error.
>
> ObjectAsserted:
> handle=[fid:1:1:com.software.warehouse.model.ItemCollect at 12a3722];
> object=com.software.warehouse.model.ItemCollect at 12a3722]
> org.mvel.PropertyAccessException: null pointer exception in property:
> itemCollect.getItemList().list()
>         at
> org.mvel.optimizers.impl.refl.ReflectiveOptimizer.compileGetChain(
> ReflectiveOptimizer.java:137)
>         at
> org.mvel.optimizers.impl.refl.ReflectiveOptimizer.optimize(
> ReflectiveOptimizer.java:92)
>         at org.mvel.Token.getReducedValueAccelerated(Token.java:302)
>         at org.mvel.ExecutableAccessor.getValue(ExecutableAccessor.java
> :46)
>         at org.mvel.MVEL.executeExpression(MVEL.java:173)
>         at
> org.drools.base.dataproviders.MVELDataProvider.getResults(
> MVELDataProvider.java:43)
>         at org.drools.reteoo.FromNode.assertTuple(FromNode.java:61)
>         at
> org.drools.reteoo.SingleTupleSinkAdapter.createAndPropagateAssertTuple(
> SingleTupleSinkAdapter.java:55)
>         at
> org.drools.reteoo.LeftInputAdapterNode.assertObject(
> LeftInputAdapterNode.java:147)
>         at
> org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(
> SingleObjectSinkAdapter.java:20)
>         at
> org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:163)
>         at org.drools.reteoo.Rete.assertObject(Rete.java:121)
>         at
> org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:196)
>         at
>
> org.drools.reteoo.ReteooWorkingMemory$WorkingMemoryReteAssertAction.propagate
> (ReteooWorkingMemory.java:157)
>         at
> org.drools.common.AbstractWorkingMemory.propagateQueuedActions(
> AbstractWorkingMemory.java:998)
>         at
> org.drools.common.AbstractWorkingMemory.assertObject(
> AbstractWorkingMemory.java:733)
>
>
> Can anyone please help me to slove this problum. Thank You.
> --
> View this message in context:
> http://www.nabble.com/3.1-M-Help-Needed-tf3535402.html#a9868300
> Sent from the drools - user mailing list archive at Nabble.com.
>
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>



-- 
  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3124-6000
  Mobile: +55 11 9218-4151
  JBoss, a division of Red Hat @ www.jboss.com
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