I have found my answer. Yes we can use the function in the LHS. and we can use the fact as a parameter for function. Here is how my rule looks like now rule CheckStationNumber when $ao:AssertionObject() eval((getRecord($ao).getStationNo()) == null) then error("station number should not be null",log); end where getRecord($ao) is the function i define in my rule and AssertionObject is the fact i insert into my ksession. thanks Abarna On Sat, Aug 1, 2009 at 5:27 PM, Abarna Ramachandran <rabarna(a)archstone.in&gt;wrote: > 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 >> >> > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Hi, I’m studying Drools 5.0.1 and find the copy/paste doesn’t work in RuleFlow Editor. My working environment: WindowsXP/Eclipse3.5/JDK5. Is the functionality planed to develop in new version? Thanks, Paul _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users