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:[EMAIL PROTECTED];
[EMAIL PROTECTED]
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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