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

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(a)yahoo.com >> <mailto: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. >> -- >> 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>;. >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> >> 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> >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >> >> > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > >