Re: [rules-users] can functions be used in rule's when part?

I really appreciate your help. I understand my mistake. I have another question. Can i use a fact as a parameter for function defined in the rule and make a call to that function in the when part of the rule. For example something like this rule CheckStationNumber when AssertionObject(getRecord(AssertionObject).getStationNo() == null) then error("station number should not be null",log); end thanks Abarna 2009/8/1 Wolfgang Laun <wolfgang.laun(a)gmail.com&gt; > The global ao must be assigned to the ksession, from your Java code, by > calling > ksession.setGlobal( "ao", assertionObject ) > before you do anything that triggers LHS evaluations. See Drools Expert, > section 4.5.2. > > The WM and rule setup as you present it does not make sense (to me). If > you insert an AssertionObject as a WM fact, you shouldn't have it as a > global. If you want it as a fact, you'll need rules with patterns like > when > AssertionObject(...) > And the same goes for BillingRecord > > -W > > > 2009/8/1 Abarna Ramachandran <rabarna(a)archstone.in&gt; > >> I am getting the following error when trying to insert my object into >> ksession. I have attached my rules and java object. Please help me in >> debugging why this is happening. I am using java 5 and drools 5.0 >> >> thanks >> >> *error while inserting:* >> >> org.drools.RuntimeDroolsException: >> defaultpkg.Rule_CheckStationNumber_0Eval0Invoker@e4aea391 : >> java.lang.NullPointerException >> >> *rules.drl* >> import java.lang.*; >> import java.util.*; >> import ct.fw.rules.*; >> import ct.fw.utils.*; >> import ct.fw.rules.*; >> import ct.fw.logging.*; >> import ct.fw.pf.dbi.*; >> import ct.fw.pf.dao.*; >> import ct.fw.pf.seq.*; >> import ct.fw.pf.util.*; >> import ct.fw.pf.vo.*; >> import ct.fw.ex.*; >> import org.apache.commons.lang.*; >> import com.aa.gccp.domain.*; >> >> global ct.fw.rules.AssertionObject ao >> global ct.fw.logging.SmartLogger log >> >> function BillingRecord getRecord(AssertionObject ao) >> { >> return (BillingRecord) ao.get(0); >> } >> function void debug(String msg,SmartLogger log) >> { >> log.debug(BusinessRulesValidator.class, msg); >> } >> function void error(String msg,SmartLogger log) >> { >> log.error(BusinessRulesValidator.class, msg); >> System.out.println("Message from rules "+msg); >> } >> >> rule CheckTrue >> when >> eval(true) >> then >> System.out.println("evaluating true"); >> end >> >> rule CheckTrue2 >> when >> eval(true) >> then >> error("evaluating from rules2",log); >> end >> >> rule CheckStationNumber >> when >> eval(((getRecord(ao)).getStationNo()) == null) >> then >> error("station number should not be null",log); >> end >> >> *part where i load the rules and insert the facts. There is no error >> when loading the rules.drl. That means no parsing errors. The error happens >> at ksessio.insert(assertionObject).* >> >> public void assertRulesObject(AssertionObject assertionObject) throws >> BusinessRuleException >> { >> long current = System.currentTimeMillis(); >> KnowledgeBase kbase = knowledgeBasesMap.get(rulesFileName); >> >> if (kbase == null) >> { >> kbase = knowledgeBasesMap.get(rulesFileName + DRL); >> } >> >> if ((kbase == null) || ((current - lastRefreshedMilliseconds) > >> refreshTimeMilliseconds)) >> { >> if (rulesFileName.toLowerCase().indexOf(DRL) == -1) >> { >> kbase = load(rulesFileName + DRL); >> } >> else >> { >> kbase = load(rulesFileName); >> } >> >> lastRefreshedMilliseconds = System.currentTimeMillis(); >> } >> this.assertionObject = assertionObject; >> >> List assertionobjectslist = new ArrayList(); >> *// i am just doing this part just to make sure assertion object is not >> null and i will get some answer. this part runs fine. * >> if (assertionObject != null) >> { >> assertionobjectslist = >> assertionObject.getValidationObjects(); >> String StationNumber = ((BillingRecord) >> assertionObject.get(0)).getStationNo(); >> System.out.println("Station Number in assertion object is " + >> StationNumber); >> } >> else >> { >> System.out.println("Assertion Object is null"); >> } >> System.out.println("The number of objects in assertionobject is " >> + assertionobjectslist.size()); >> >> try >> { >> StatefulKnowledgeSession ksession = >> kbase.newStatefulKnowledgeSession(); >> *//the next line throws the exception* >> ksession.insert(assertionObject); >> >> ksession.fireAllRules(); >> ksession.dispose(); >> >> } >> catch (RuntimeDroolsException e1) >> { >> throw new BusinessRuleException(e1.getMessage()); >> } >> >> businessRulesErrors = assertionObject.getBusinessRulesErrors(); >> >> if (throwException) >> { >> if (!assertionObject.getBusinessRulesErrors().isEmpty()) >> { >> throw new BusinessRuleException(businessRulesErrors); >> } >> } >> } >> >> >> Any help is appreciated. thanks >> >> >> _______________________________________________ >> 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 > >