2007/4/6, vista2007 <my_vista2007@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@12a3722];
object=com.software.warehouse.model.ItemCollect@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.
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