Re: [rules-users] Getting facts from external source using 'from' and parametrized method call

Hi, I mean, I checked the global and it was set. I'm attaching the code, that causes the problem (Java and DRL). You need just to set a proper path to DRL file while setting file property in Java file. I think, the global is set in proper way. In DRL, depending which rule is commented/uncommented, the code works or not. Best regards, Przemek Jaroslaw Kijanowski pisze: > And did the stack trace change? Can you post more details (drl, java > src)? > > Przemysław Różycki wrote: >> Yes, I did. This was the first thing I've checked. >> >> Best regards, >> Przemek >> >> Jaroslaw Kijanowski pisze: >>> Did you set the global on your session? >>> >>> http://downloads.jboss.com/drools/docs/4.0.7.19894.GA/html_single/index.h... >>> >>> >>> Cheers >>> >>> Przemysław Różycki wrote: >>>> Sorry for responsing myself, but I'm still working on it and found >>>> that when factSource is a fact, not global, the rule works very >>>> well. I mean, this rule works fine: >>>> >>>> rule "My Rule" >>>> when >>>> $factSrc : FactSource( ) >>>> $fact : Fact( ) from $factSrc.getSomeFacts("a","b","c") >>>> then >>>> // do something >>>> end >>>> >>>> so what's the difference between invocation on global object and >>>> invocation on fact object? Why the first one doesn't work and the >>>> second one works? >>>> >>>> Best regards, >>>> Przemek >>>> >>>> >>>> Przemysław Różycki pisze: >>>>> Hi, >>>>> >>>>> could I ask for some advice, please, how to use a parametrized >>>>> method call to get some data using 'from' element in LHS. >>>>> >>>>> To be more precise, I would like to do something like this: >>>>> >>>>> rule "My Rule" >>>>> when >>>>> $fact : Fact( ) from factSource.getSomeFacts("a","b","c") >>>>> then >>>>> // do something >>>>> end >>>>> >>>>> where factSource is for example some global and >>>>> getSomeFacts(String,String,String) is a parametrized method that >>>>> returns some array of Fact objects. >>>>> >>>>> Unfortunately, when I try to launch the following rule I have an >>>>> error: >>>>> >>>>> Exception in thread "main" org.mvel.PropertyAccessException: >>>>> unable to resolve property: factSource.getSomeFacts("a","b","c") >>>>> 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 com.sample.DroolsTest6.main(DroolsTest6.java:29) >>>>> 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) >>>>> >>>>> ... 21 more >>>>> >>>>> Documentation says: >>>>> >>>>> "The from Conditional Element allows users to specify a source for >>>>> patterns to reason over. This allows the engine to reason over >>>>> data not in the Working Memory. This could be a sub-field on a >>>>> bound variable or the results of a method call." >>>>> >>>>> so I assume that it is possible to do what I want. If not, could I >>>>> ask for an advice of some workaround, please? >>>>> >>>>> Best regards, >>>> >>>> _______________________________________________ >>>> 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 >> >> _______________________________________________ >> 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 >