Re: [rules-users] Can drools work in multithreaded environment?

Hi, While doing a load test with jmeter,my web service application with drools works fine for few clients(5 simultaneous hits for 10 times) but when i increase my clients(120 simultanious hits for 100 times) i am gettin the following exception for few client, (out of 12,000 hits 200 throws this exception) problem encountered at node [11] 5{170,189}: unable to resolve property: null pointer exception in property: declr.identifier org.mvel.TemplateInterpreter.execute(TemplateInterpreter.java:528) org.mvel.TemplateInterpreter.parse(TemplateInterpreter.java:341) org.drools.rule.builder.dialect.java.AbstractJavaBuilder.generatTemplates(AbstractJavaBuilder.java:113) org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:95) org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:67) org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:446) org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:304) org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:167) com.drools.util.RuleEngine.applyRule(RuleEngine.java:47) com.drools.util.DroolsController.getAdvertisement(DroolsController.java:94) com.drools.util.DroolsController.routeBusinessMethod(DroolsController.java:67) com.drools.util.DroolsController.getAdvertisement(DroolsController.java:43) com.drools.MyEndpoint.getAdvertisement(MyEndpoint.java:237) com.drools.MyEndpoint.process(MyEndpoint.java:144) org.apache.servicemix.common.AsyncBaseLifeCycle.doProcess(AsyncBaseLifeCycle.java:489) org.apache.servicemix.common.AsyncBaseLifeCycle.processExchange(AsyncBaseLifeCycle.java:441) org.apache.servicemix.common.BaseLifeCycle.onMessageExchange(BaseLifeCycle.java:46) org.apache.servicemix.jbi.messaging.DeliveryChannelImpl.processInBound(DeliveryChannelImpl.java:595) org.apache.servicemix.jbi.nmr.flow.AbstractFlow.doRouting(AbstractFlow.java:174) org.apache.servicemix.jbi.nmr.flow.seda.SedaFlow.doRouting(SedaFlow.java:176) org.apache.servicemix.jbi.nmr.flow.seda.SedaQueue$1.run(SedaQueue.java:134) edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:665) edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:690) java.lang.Thread.run(Thread.java:619) drl file has 6 rules, 5 rules - which retract facts which passes the rule. 1 rule(low salience) - will add the fact to java.util.List (set as global) which passes the rule. 1 . Am i getting this error bcoz of the global list? or any other reason? 2 . How to solve this problem? here the rules, <code> global java.util.List feasibleAdv; rule " percentage rule " when $adv : Advertisement( percentageLimit != 0 , percentageLimit < playedPercentage ) then System.out.println("remove this adv (failed percentage): "+$adv.getAdvertisementID()); retract($adv); end rule "per day rule" when $adv : Advertisement( limitperday != 0 , limitperday <= playedperday ) then //System.out.println("remove this adv (failed day): "+$adv.getAdvertisementID()); retract($adv); end rule "per week rule" when $adv : Advertisement( limitperweek != 0 , limitperweek <= playedperweek) then //System.out.println("remove this adv (failed week): "+$adv.getAdvertisementID()); retract($adv); end rule "per month rule" when $adv : Advertisement( limitpermonth != 0 , limitpermonth <= playedpermonth) then //System.out.println("remove this adv (failed month) : "+$adv.getAdvertisementID()); retract($adv); end rule "total played rule" when $adv : Advertisement( totallimit != 0 , totallimit <= totalplayed ) then //System.out.println("remove this adv (failed total played) : "+$adv.getAdvertisementID()); retract($adv); end rule "advertisement select rule" salience -1 when $adv : Advertisement( $playedPercentPerAdvertisement : playedPercentPerAdvertisement) not( Advertisement( playedPercentPerAdvertisement < $playedPercentPerAdvertisement ) ) $advertisementCount : Integer() then boolean status = true; if($advertisementCount-1 < 0){ //System.out.println("halted"); status = false; drools.halt(); } if(status){ feasibleAdv.add($adv); drools.update( drools.getWorkingMemory().getFactHandle($advertisementCount), new Integer($advertisementCount-1) ); retract($adv); } end </code> -- View this message in context: http://www.nabble.com/Can-drools-work-in-multithreaded-environment--tp170... 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