Hi, I'm using drools 4.0.1. I'm first adding one package to my RuleBase object, and everything works just fine: ... builder.addPackageFromDrl(new InputStreamReader(resource.getInputStream ())); if(ruleBase == null) { ruleBase = RuleBaseFactory.newRuleBase(); } ruleBase.addPackage(builder.getPackage()); But after some time i need to refresh my rules, so i'm using following code to remove previous package: ruleBase.removePackage("org.sample.mypackage"); and i'm getting the following error: java.lang.NullPointerException at org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java :222) at org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java :272) at org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java :460) at com.diosphere.diomedia.common.drools.impl.RulesServiceImpl.refresh( RulesServiceImpl.java:121) at com.diosphere.diomedia.service.impl.PromotionManagerImpl.refreshDRLs( PromotionManagerImpl.java:39) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java :39) at sun.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at uk.ltd.getahead.dwr.impl.ExecuteQuery.execute(ExecuteQuery.java :170) at uk.ltd.getahead.dwr.impl.DefaultProcessor.doExec(DefaultProcessor.java :552) at uk.ltd.getahead.dwr.impl.DefaultProcessor.handle(DefaultProcessor.java:88) at uk.ltd.getahead.dwr.DWRServlet.doPost(DWRServlet.java:178) at javax.servlet.http.HttpServlet.service(HttpServlet.java:710) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:206) at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage( PageFilter.java:118) at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter( PageFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:206) at net.sf.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java :167) at net.sf.acegisecurity.util.FilterToBeanProxy.doFilter( FilterToBeanProxy.java:120) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke( StandardWrapperValve.java:230) at org.apache.catalina.core.StandardContextValve.invoke( StandardContextValve.java:175) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java :128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java :104) at org.apache.catalina.core.StandardEngineValve.invoke( StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java :261) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process( Http11Protocol.java:581) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run( JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619) Does anyone have a clue what might be the problem, and how to fix it? Kind regards! -- View this message in context: http://www.nabble.com/Problem-with-removePackage%28%29-tf4727072.html#a13... 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

Hi Edson, thanx for answering, i've tried 4.0.3, but i get the following error when i try to refresh my rules: java.lang.IllegalArgumentException: Cannot remove a sink, when the list of sinks is null at org.drools.reteoo.ObjectSource.removeObjectSink( ObjectSource.java:116) at org.drools.reteoo.AlphaNode.remove(AlphaNode.java:192) at org.drools.reteoo.LeftInputAdapterNode.remove(LeftInputAdapterNode.java :189) at org.drools.reteoo.BetaNode.remove(BetaNode.java:173) at org.drools.reteoo.RuleTerminalNode.remove(RuleTerminalNode.java :466) at org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java :224) at org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java :270) at org.drools.common.AbstractRuleBase.removeRule( AbstractRuleBase.java:614) at org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java :531) ... During refresh i do the following: public void refresh() { try { ruleBase.removePackage("org.sample.mypackage"); // reading drl files from direcotry and puting them in the package ... for(int i = 0; i < size; i++ ) { builder.addPackageFromDrl( new InputStreamReader(getClass().getResourceAsStream( "package" + i + ".drl" ) ) );; } if(ruleBase == null) { ruleBase = RuleBaseFactory.newRuleBase(); } ruleBase.addPackage(builder.getPackage()); } catch(Exception e) { log.error("Error while refreshing rules: ", e); } } and one of my .drl files (they all belong to the same package) looks something like this: package org.sample.mypackage import org.sample.Orders; import org.sample.OrderItem; import org.sample.service.OrderService; import java.util.ArrayList import org.apache.log4j.Logger global OrderService orderService global Logger log rule "Apply Discount" when orders : Orders(); items : ArrayList() from collect ( OrderItem(value > 100) from order.items) then log.debug("Apply Discount"); orderService.applyDiscount(items); end were OrderService is a service class that i'm using to do some calculating. Do you have some idea about what could be causing this error? Edson Tirelli-3 wrote: > > Can you try 4.0.3? There was some fix for package management included > in > 4.0.2 if I'm not mistaken... > > []s > Edson > > 2007/10/31, igor_b <igorbolic(a)gmail.com&gt;: >> >> >> Hi, >> >> I'm using drools 4.0.1. I'm first adding one package to my RuleBase >> object, >> and everything works just fine: >> >> ... >> builder.addPackageFromDrl(new InputStreamReader(resource.getInputStream >> ())); >> >> if(ruleBase == null) { >> ruleBase = RuleBaseFactory.newRuleBase(); >> } >> ruleBase.addPackage(builder.getPackage()); >> >> >> But after some time i need to refresh my rules, so i'm using following >> code >> to remove previous package: >> >> ruleBase.removePackage("org.sample.mypackage"); >> >> and i'm getting the following error: >> >> java.lang.NullPointerException >> at org.drools.reteoo.ReteooBuilder.removeRule( ReteooBuilder.java >> :222) >> at >> org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java >> :272) >> at >> org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java >> :460) >> at >> com.diosphere.diomedia.common.drools.impl.RulesServiceImpl.refresh( >> RulesServiceImpl.java:121) >> at >> com.diosphere.diomedia.service.impl.PromotionManagerImpl.refreshDRLs( >> PromotionManagerImpl.java:39) >> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) >> at >> sun.reflect.NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java >> :39) >> at >> sun.reflect.DelegatingMethodAccessorImpl.invoke( >> DelegatingMethodAccessorImpl.java:25) >> at java.lang.reflect.Method.invoke(Method.java:597) >> at >> uk.ltd.getahead.dwr.impl.ExecuteQuery.execute(ExecuteQuery.java >> :170) >> at >> uk.ltd.getahead.dwr.impl.DefaultProcessor.doExec(DefaultProcessor.java >> :552) >> at >> uk.ltd.getahead.dwr.impl.DefaultProcessor.handle(DefaultProcessor.java :88) >> at uk.ltd.getahead.dwr.DWRServlet.doPost(DWRServlet.java:178) >> at javax.servlet.http.HttpServlet.service(HttpServlet.java:710) >> at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) >> at >> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( >> ApplicationFilterChain.java:290) >> at >> org.apache.catalina.core.ApplicationFilterChain.doFilter( >> ApplicationFilterChain.java:206) >> at >> com.opensymphony.module.sitemesh.filter.PageFilter.parsePage( >> PageFilter.java:118) >> at >> com.opensymphony.module.sitemesh.filter.PageFilter.doFilter( >> PageFilter.java:52) >> at >> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( >> ApplicationFilterChain.java:235) >> at >> org.apache.catalina.core.ApplicationFilterChain.doFilter( >> ApplicationFilterChain.java:206) >> at >> net.sf.acegisecurity.util.FilterChainProxy.doFilter( FilterChainProxy.java >> :167) >> at >> net.sf.acegisecurity.util.FilterToBeanProxy.doFilter( >> FilterToBeanProxy.java:120) >> at >> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( >> ApplicationFilterChain.java:235) >> at >> org.apache.catalina.core.ApplicationFilterChain.doFilter( >> ApplicationFilterChain.java:206) >> at >> org.apache.catalina.core.StandardWrapperValve.invoke( >> StandardWrapperValve.java:230) >> at >> org.apache.catalina.core.StandardContextValve.invoke( >> StandardContextValve.java:175) >> at >> org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java >> :128) >> at >> org.apache.catalina.valves.ErrorReportValve.invoke( ErrorReportValve.java >> :104) >> at >> org.apache.catalina.core.StandardEngineValve.invoke( >> StandardEngineValve.java:109) >> at >> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java >> :261) >> at >> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java :844) >> at >> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process ( >> Http11Protocol.java:581) >> at org.apache.tomcat.util.net.JIoEndpoint$Worker.run( >> JIoEndpoint.java:447) >> at java.lang.Thread.run(Thread.java:619) >> >> Does anyone have a clue what might be the problem, and how to fix it? >> Kind regards! >> -- >> View this message in context: >> http://www.nabble.com/Problem-with-removePackage%28%29-tf4727072.html#a13... >> 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 >> > > > > -- > Edson Tirelli > Software Engineer - JBoss Rules Core Developer > Office: +55 11 3529-6000 > Mobile: +55 11 9287-5646 > JBoss, a division of Red Hat @ www.jboss.com > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- View this message in context: http://www.nabble.com/Problem-with-removePackage%28%29-tf4727072.html#a13... 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

Hi Edson, sorry for a late reply. I found out that there is problem in DRL file i.e. i cannot use package com.sample.mypackage rule "Apply discount" no-loop true when $order: Order(); $items : ArrayList() from collect (OrderItem() from $order.items) then #apply discount end when i try to remove previous package from ruleBase object, i get the error: java.lang.IllegalArgumentException: Cannot remove a sink, when the list of sinks is null at org.drools.reteoo.ObjectSource.removeObjectSink( ObjectSource.java:116) at org.drools.reteoo.AlphaNode.remove(AlphaNode.java:181) at org.drools.reteoo.LeftInputAdapterNode.remove(LeftInputAdapterNode.java :204) at org.drools.reteoo.FromNode.remove(FromNode.java:153) at org.drools.reteoo.RightInputAdapterNode.remove(RightInputAdapterNode.java :167) at org.drools.reteoo.BetaNode.remove(BetaNode.java:186) at org.drools.reteoo.RuleTerminalNode.remove(RuleTerminalNode.java :461) at org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java :224) at org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java :272) at org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java :460) ... instead, i implemented the same thing this way: package com.sample.mypackage rule "Explode Cart" salience 11 dialect "java" when $order: Order() $item : OrderItem() from $order.items then insert( $item ); end rule "Apply discount" no-loop true when $order : Order(); $items : ArrayList() from collect (OrderItem()) then #apply discount end if this is a bug, i hope it'll help finding it and fixing. Kind regards! Edson Tirelli-3 wrote: > > Igor, > > Looks like a bug to me... can you please open a JIRA and attach a self > contained test case showing the problem? This will speed up the > resolution... > > Thanks > Edson > > 2007/11/1, igor_b <igorbolic(a)gmail.com&gt;: >> >> >> Hi Edson, >> >> thanx for answering, i've tried 4.0.3, but i get the following error when >> i >> try to refresh my rules: >> >> java.lang.IllegalArgumentException: Cannot remove a sink, when the list >> of >> sinks is null >> at org.drools.reteoo.ObjectSource.removeObjectSink( >> ObjectSource.java:116) >> at org.drools.reteoo.AlphaNode.remove(AlphaNode.java:192) >> at >> org.drools.reteoo.LeftInputAdapterNode.remove(LeftInputAdapterNode.java >> :189) >> at org.drools.reteoo.BetaNode.remove(BetaNode.java:173) >> at >> org.drools.reteoo.RuleTerminalNode.remove(RuleTerminalNode.java >> :466) >> at org.drools.reteoo.ReteooBuilder.removeRule( ReteooBuilder.java >> :224) >> at >> org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java >> :270) >> at org.drools.common.AbstractRuleBase.removeRule( >> AbstractRuleBase.java:614) >> at >> org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java >> :531) >> ... >> >> >> During refresh i do the following: >> public void refresh() { >> try { >> ruleBase.removePackage("org.sample.mypackage"); >> >> // reading drl files from direcotry and puting >> them >> in the package >> >> ... >> for(int i = 0; i < size; i++ ) { >> builder.addPackageFromDrl( new >> InputStreamReader(getClass().getResourceAsStream( "package" + i + ".drl" >> ) >> ) >> );; >> >> } >> if(ruleBase == null) { >> ruleBase = RuleBaseFactory.newRuleBase (); >> } >> ruleBase.addPackage(builder.getPackage()); >> >> >> } catch(Exception e) { >> log.error("Error while refreshing rules: ", e); >> } >> } >> >> and one of my .drl files (they all belong to the same package) looks >> something like this: >> >> package org.sample.mypackage >> >> import org.sample.Orders; >> import org.sample.OrderItem; >> import org.sample.service.OrderService; >> >> import java.util.ArrayList >> import org.apache.log4j.Logger >> >> global OrderService orderService >> global Logger log >> >> rule "Apply Discount" >> when >> orders : Orders(); >> items : ArrayList() from collect ( >> OrderItem(value > 100) >> from order.items) >> then >> log.debug("Apply Discount"); >> orderService.applyDiscount(items); >> end >> >> were OrderService is a service class that i'm using to do some >> calculating. >> >> Do you have some idea about what could be causing this error? >> >> >> >> >> >> >> >> Edson Tirelli-3 wrote: >> > >> > Can you try 4.0.3? There was some fix for package management >> included >> > in >> > 4.0.2 if I'm not mistaken... >> > >> > []s >> > Edson >> > >> > 2007/10/31, igor_b <igorbolic(a)gmail.com&gt;: >> >> >> >> >> >> Hi, >> >> >> >> I'm using drools 4.0.1. I'm first adding one package to my RuleBase >> >> object, >> >> and everything works just fine: >> >> >> >> ... >> >> builder.addPackageFromDrl(new >> InputStreamReader(resource.getInputStream >> >> ())); >> >> >> >> if(ruleBase == null) { >> >> ruleBase = RuleBaseFactory.newRuleBase(); >> >> } >> >> ruleBase.addPackage(builder.getPackage()); >> >> >> >> >> >> But after some time i need to refresh my rules, so i'm using following >> >> code >> >> to remove previous package: >> >> >> >> ruleBase.removePackage("org.sample.mypackage"); >> >> >> >> and i'm getting the following error: >> >> >> >> java.lang.NullPointerException >> >> at org.drools.reteoo.ReteooBuilder.removeRule( >> ReteooBuilder.java >> >> :222) >> >> at >> >> org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java >> >> :272) >> >> at >> >> org.drools.common.AbstractRuleBase.removePackage( AbstractRuleBase.java >> >> :460) >> >> at >> >> com.diosphere.diomedia.common.drools.impl.RulesServiceImpl.refresh( >> >> RulesServiceImpl.java:121) >> >> at >> >> com.diosphere.diomedia.service.impl.PromotionManagerImpl.refreshDRLs ( >> >> PromotionManagerImpl.java:39) >> >> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) >> >> at >> >> sun.reflect.NativeMethodAccessorImpl.invoke( >> NativeMethodAccessorImpl.java >> >> :39) >> >> at >> >> sun.reflect.DelegatingMethodAccessorImpl.invoke( >> >> DelegatingMethodAccessorImpl.java:25) >> >> at java.lang.reflect.Method.invoke(Method.java:597) >> >> at >> >> uk.ltd.getahead.dwr.impl.ExecuteQuery.execute(ExecuteQuery.java >> >> :170) >> >> at >> >> uk.ltd.getahead.dwr.impl.DefaultProcessor.doExec( DefaultProcessor.java >> >> :552) >> >> at >> >> uk.ltd.getahead.dwr.impl.DefaultProcessor.handle( DefaultProcessor.java >> :88) >> >> at uk.ltd.getahead.dwr.DWRServlet.doPost(DWRServlet.java :178) >> >> at >> javax.servlet.http.HttpServlet.service(HttpServlet.java:710) >> >> at >> javax.servlet.http.HttpServlet.service(HttpServlet.java:803) >> >> at >> >> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( >> >> ApplicationFilterChain.java:290) >> >> at >> >> org.apache.catalina.core.ApplicationFilterChain.doFilter( >> >> ApplicationFilterChain.java:206) >> >> at >> >> com.opensymphony.module.sitemesh.filter.PageFilter.parsePage( >> >> PageFilter.java:118) >> >> at >> >> com.opensymphony.module.sitemesh.filter.PageFilter.doFilter( >> >> PageFilter.java:52) >> >> at >> >> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( >> >> ApplicationFilterChain.java:235) >> >> at >> >> org.apache.catalina.core.ApplicationFilterChain.doFilter( >> >> ApplicationFilterChain.java:206) >> >> at >> >> net.sf.acegisecurity.util.FilterChainProxy.doFilter( >> FilterChainProxy.java >> >> :167) >> >> at >> >> net.sf.acegisecurity.util.FilterToBeanProxy.doFilter( >> >> FilterToBeanProxy.java:120) >> >> at >> >> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( >> >> ApplicationFilterChain.java:235) >> >> at >> >> org.apache.catalina.core.ApplicationFilterChain.doFilter( >> >> ApplicationFilterChain.java:206) >> >> at >> >> org.apache.catalina.core.StandardWrapperValve.invoke( >> >> StandardWrapperValve.java:230) >> >> at >> >> org.apache.catalina.core.StandardContextValve.invoke( >> >> StandardContextValve.java:175) >> >> at >> >> org.apache.catalina.core.StandardHostValve.invoke( >> StandardHostValve.java >> >> :128) >> >> at >> >> org.apache.catalina.valves.ErrorReportValve.invoke( >> ErrorReportValve.java >> >> :104) >> >> at >> >> org.apache.catalina.core.StandardEngineValve.invoke( >> >> StandardEngineValve.java:109) >> >> at >> >> org.apache.catalina.connector.CoyoteAdapter.service( CoyoteAdapter.java >> >> :261) >> >> at >> >> org.apache.coyote.http11.Http11Processor.process( Http11Processor.java >> :844) >> >> at >> >> >> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process >> ( >> >> Http11Protocol.java:581) >> >> at org.apache.tomcat.util.net.JIoEndpoint$Worker.run( >> >> JIoEndpoint.java:447) >> >> at java.lang.Thread.run(Thread.java:619) >> >> >> >> Does anyone have a clue what might be the problem, and how to fix it? >> >> Kind regards! >> >> -- >> >> View this message in context: >> >> >> http://www.nabble.com/Problem-with-removePackage%28%29-tf4727072.html#a13... >> >> 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 >> >> >> > >> > >> > >> > -- >> > Edson Tirelli >> > Software Engineer - JBoss Rules Core Developer >> > Office: +55 11 3529-6000 >> > Mobile: +55 11 9287-5646 >> > JBoss, a division of Red Hat @ www.jboss.com >> > >> > _______________________________________________ >> > rules-users mailing list >> > rules-users(a)lists.jboss.org >> > https://lists.jboss.org/mailman/listinfo/rules-users >> > >> > >> >> -- >> View this message in context: >> http://www.nabble.com/Problem-with-removePackage%28%29-tf4727072.html#a13... >> 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 >> > > > > -- > Edson Tirelli > Software Engineer - JBoss Rules Core Developer > Office: +55 11 3529-6000 > Mobile: +55 11 9287-5646 > JBoss, a division of Red Hat @ www.jboss.com > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- View this message in context: http://www.nabble.com/Problem-with-removePackage%28%29-tf4727072.html#a13... 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