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

[Mark Proctor]

MVEL is currently only used for 'from', it should work fine for that 
purpose.

Mark
Edson Tirelli wrote:
>
>    Mark,
>
>    What is the status on MVEL stuff used in core?
>
>    []s
>    Edson
>
> 2007/4/6, vista2007 <my_vista2007 at yahoo.com 
> <mailto: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
>     <http://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 <http://www.jboss.com>
> ------------------------------------------------------------------------
>
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