though I referred other thread about this topic, I'm not successful to make a dao call. I beg your pardon to ask again. 1. I want to pass the fact object to the dao function which returns boolean. I tried following rule and getting " Unexpected token '$fact'" as eclipse compilation error. Please guide with right syntax. global RuleDAO dao; rule "test DAO call" $fact : Fact(some condition) fact : Fact(dao.isValid($fact)) then #do something end 2. Will be there any performance issue for above kind of rule? Thanks -- View this message in context: http://www.nabble.com/DAO-call-in-LHS-tp20709043p20709043.html Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

From: techy <techluver007(a)gmail.com&gt; Subject: Re: [rules-users] DAO call in LHS To: rules-users(a)lists.jboss.org Date: Friday, November 28, 2008, 4:52 PM I tried following simple rule with dao call and still no luck. getting "org.mvel.PropertyAccessException: unable to resolve property: dao.getList()". could not figure out what is wrong. some help please. rule "Test DAo call" when count : List(size > 0) from dao.getList() then System.out.println("DAO call is successful!"); end dao.getList() definition: public List<Integer> getList(){ return Collections.EMPTY_LIST; } Exception stackTRace: org.mvel.PropertyAccessException: unable to resolve property: dao.getList() at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:295) at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:110) at org.mvel.ast.VariableDeepPropertyNode.getReducedValueAccelerated(VariableDeepPropertyNode.java:26) at org.mvel.ast.PropertyASTNode.initializePropertyNode(PropertyASTNode.java:70) at org.mvel.ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.java:24) at org.mvel.MVELRuntime.execute(MVELRuntime.java:90) at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111) at org.mvel.MVEL.executeExpression(MVEL.java:252) at org.drools.base.dataproviders.MVELDataProvider.getResults(MVELDataProvider.java:55) at org.drools.reteoo.FromNode.assertTuple(FromNode.java:68) at org.drools.reteoo.SingleTupleSinkAdapter.createAndPropagateAssertTuple(SingleTupleSinkAdapter.java:55) at org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:116) at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:22) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:162) at org.drools.reteoo.Rete.assertObject(Rete.java:175) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192) at org.drools.reteoo.ReteooWorkingMemory$WorkingMemoryReteAssertAction.execute(ReteooWorkingMemory.java:181) at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:1312) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:915) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:883) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:684) at org.drools.reteoo.ReteooStatelessSession.execute(ReteooStatelessSession.java:160) at DAOCallTest.main() Caused by: java.lang.NullPointerException at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:530) at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:261) ... 22 more Michal Bali-2 wrote: > > this blog post may be of use > http://blog.athico.com/2007/06/chained-from-accumulate-collect.html > > > On Wed, Nov 26, 2008 at 9:08 PM, techy <techluver007(a)gmail.com&gt; wrote: > >> >> though I referred other thread about this topic, I'm not successful to >> make >> a >> dao call. >> I beg your pardon to ask again. >> >> 1. I want to pass the fact object to the dao function which returns >> boolean. >> I tried following rule and getting " >> Unexpected token '$fact'" as eclipse compilation error. Please guide with >> right syntax. >> global RuleDAO dao; >> >> rule "test DAO call" >> $fact : Fact(some condition) >> fact : Fact(dao.isValid($fact)) >> then >> #do something >> end >> >> 2. Will be there any performance issue for above kind of rule? >> >> Thanks >> >> -- >> View this message in context: >> http://www.nabble.com/DAO-call-in-LHS-tp20709043p20709043.html >> Sent from the drools - user mailing list archive at Nabble.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 > > -- View this message in context: http://www.nabble.com/DAO-call-in-LHS-tp20709043p20741585.html Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users