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

Of course, you can get rid of 'pre rule'. I forgot to delete it. Best regards, Przemek Przemysław Różycki pisze: > 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 >> >> _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users