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

[Mark Proctor]

Can you try out trunk and see if you still get the bug? As its using a 
much newer version of MVEL.

Mark
vista2007 wrote:
> 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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>>>     https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>>
>>>
>>>
>>> -- 
>>>   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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>>
>>     
>
>   

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