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

[vista2007]

hi,
What is the possible reason to cause this error ? 

regards
Gaminda



Mark Proctor wrote:
> 
> 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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> 
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