I have the following code: (note String[] ruleFiles contains only one string) public class Engine { private static RuleBase ruleBase; public void start(String[] ruleFiles) throws Exception { PackageBuilderConfiguration cfg = new PackageBuilderConfiguration(); JavaDialectConfiguration javaConf = (JavaDialectConfiguration) cfg.getDialectConfiguration("java"); javaConf.setCompiler(JavaDialectConfiguration.ECLIPSE); PackageBuilder builder = new PackageBuilder(cfg); for (String file : ruleFiles) { builder.addPackageFromDrl(new InputStreamReader( ClassLoader.getSystemResourceAsStream(file))); } Package pkg = builder.getPackage(); PackageBuilderErrors errors = builder.getErrors(); if (errors.getErrors().length != 0) { // do something } RuleBaseConfiguration conf = new RuleBaseConfiguration(); conf.setAssertBehaviour( RuleBaseConfiguration.AssertBehaviour.EQUALITY); ruleBase = RuleBaseFactory.newRuleBase(); ruleBase.addPackage(pkg); ruleBase.newStatefulSession(false); } } At the builder.addPackageFromDrl(new InputStreamReader( ClassLoader.getSystemResourceAsStream(file))); line I'm getting the following exception: java.lang.NullPointerException at org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build( JavaConsequenceBuilder.java:54) at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java :67) at org.drools.compiler.PackageBuilder.addRule( PackageBuilder.java:446) at org.drools.compiler.PackageBuilder.addPackage( PackageBuilder.java:304) at org.drools.compiler.PackageBuilder.addPackageFromDrl( PackageBuilder.java:167) at myPackage.rivoli.service.rules.Engine.start(Engine.java:33) at myPackage.rivoli.rules.LeaderKingAndHeirTest.setUp( LeaderKingAndHeirTest.java:26) at com.intellij.rt.execution.junit.JUnitStarter.main( JUnitStarter.java:40) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:25) at com.intellij.rt.execution.application.AppMain.main( AppMain.java:90) I am using Drools 4.0.3 I have the following jars in my class path: antlr-runtime-3.0.jar core-3.2.3.v_686_R32x.jar drools-compiler-4.0.3.jar drools-core-4.0.3.jar mvel14-1.2.10.jar Any ideas would be helpful. Thanks. Michael Fuller "In theory there is no difference between theory and practice. But, in practice, there is." - Jan L.A. van de Snepscheut _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Sure. Thanks package validActions; import myPackage.domain.leader.LeaderImpl; import myPackage.domain.location.LocationImpl; import myPackage.domain.leader.LeaderTypeImpl; import myPackage.rivoli.service.rules.RuleResult; rule "leaders in same location" salience 10 when $result : RuleResult(rulesPassed not contains "leaders in same location") $loc : LocationImpl() $leaderName : String() $leader1 : LeaderImpl(name == $leaderName, location == $loc) $leader2 : LeaderImpl(name != $leaderName, this != $leader1, location == $loc) then $result.addPassedRule(leaders in same location); update($result); end rule "leaders king and heir" salience 10 when $result : RuleResult(rulesPassed not contains "leaders king and heir") $leaderName : String() $king : LeaderTypeImpl(name == "King") $heir : LeaderTypeImpl(name == "Heir") $leader1 : LeaderImpl(name == $leaderName, leaderType == $king) $leader2 : LeaderImpl(name != $leaderName, this != $leader1, leaderType == $heir) then $result.addPassedRule("leaders king and heir"); update($result); end rule "leader in capital" salience 10 when $result : RuleResult(rulesPassed not contains "leader in capital") $loc : LocationImpl(capital == true) $leader1 : LeaderImpl(location == $loc) then $result.addPassedRule("leader in capital"); update($result); end rule "leader in homeland" salience 10 when $result : RuleResult(rulesPassed not contains "leader in homeland") $loc : LocationImpl(homeland == true) $leader1 : LeaderImpl(location == $loc) then $result.addPassedRule("leader in homeland"); update($result); end rule "abdication allowed" when $result : RuleResult (rulesPassed not contains "abdication allowed" && rulesPassed contains "leaders in same location" && rulesPassed contains "leaders king and heir") then $result.addPassedRule("abdication allowed"); update($result); end ------------------------------ *From:* rules-users-bounces(a)lists.jboss.org [mailto: rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Edson Tirelli *Sent:* Tuesday, October 30, 2007 2:31 PM *To:* Rules Users List *Subject:* Re: [rules-users] RE: JavaConsequenceBuilder.buildNullPointerException Michael, Can you show us your rule(s) please? it is raising the NPE when trying to get the list of variables you use in the consequence... as soon as we determine what the real problem is, I can fix the error message... []s Edson 2007/10/30, Michael Fuller <mfuller(a)ihets.org&gt;: I have the following code: (note String[] ruleFiles contains only one string) public class Engine { private static RuleBase ruleBase; public void start(String[] ruleFiles) throws Exception { PackageBuilderConfiguration cfg = new PackageBuilderConfiguration(); JavaDialectConfiguration javaConf = (JavaDialectConfiguration) cfg.getDialectConfiguration("java"); javaConf.setCompiler(JavaDialectConfiguration.ECLIPSE); PackageBuilder builder = new PackageBuilder(cfg); for (String file : ruleFiles) { builder.addPackageFromDrl(new InputStreamReader( ClassLoader.getSystemResourceAsStream(file))); } Package pkg = builder.getPackage(); PackageBuilderErrors errors = builder.getErrors(); if (errors.getErrors().length != 0) { // do something } RuleBaseConfiguration conf = new RuleBaseConfiguration(); conf.setAssertBehaviour( RuleBaseConfiguration.AssertBehaviour.EQUALITY); ruleBase = RuleBaseFactory.newRuleBase(); ruleBase.addPackage(pkg); ruleBase.newStatefulSession(false); } } At the builder.addPackageFromDrl(new InputStreamReader( ClassLoader.getSystemResourceAsStream(file))); line I'm getting the following exception: java.lang.NullPointerException at org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build( JavaConsequenceBuilder.java:54) at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java :67) at org.drools.compiler.PackageBuilder.addRule( PackageBuilder.java:446) at org.drools.compiler.PackageBuilder.addPackage( PackageBuilder.java:304) at org.drools.compiler.PackageBuilder.addPackageFromDrl( PackageBuilder.java:167) at myPackage.rivoli.service.rules.Engine.start(Engine.java:33) at myPackage.rivoli.rules.LeaderKingAndHeirTest.setUp( LeaderKingAndHeirTest.java:26) at com.intellij.rt.execution.junit.JUnitStarter.main( JUnitStarter.java:40) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:25) at com.intellij.rt.execution.application.AppMain.main( AppMain.java:90) I am using Drools 4.0.3 I have the following jars in my class path: antlr-runtime-3.0.jar core-3.2.3.v_686_R32x.jar drools-compiler-4.0.3.jar drools-core-4.0.3.jar mvel14-1.2.10.jar Any ideas would be helpful. Thanks. Michael Fuller "In theory there is no difference between theory and practice. But, in practice, there is." - Jan L.A. van de Snepscheut _______________________________________________ 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

Thank you so very much. Yes, changing the parse to handle this would be very helpful. ------------------------------ *From:* rules-users-bounces(a)lists.jboss.org [mailto: rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Edson Tirelli *Sent:* Wednesday, October 31, 2007 12:32 PM *To:* Rules Users List *Subject:* Re: [rules-users] RE: JavaConsequenceBuilder.buildNullPointerException Michael, The problem is you missed the "" on: $result.addPassedRule(leaders in same location); I will fix the parser code to not throw NPE for this anymore. Thanks, Edson 2007/10/31, Michael Fuller <mfuller(a)ihets.org&gt;: Sure. Thanks package validActions; import myPackage.domain.leader.LeaderImpl; import myPackage.domain.location.LocationImpl; import myPackage.domain.leader.LeaderTypeImpl; import myPackage.rivoli.service.rules.RuleResult; rule "leaders in same location" salience 10 when $result : RuleResult(rulesPassed not contains "leaders in same location") $loc : LocationImpl() $leaderName : String() $leader1 : LeaderImpl(name == $leaderName, location == $loc) $leader2 : LeaderImpl(name != $leaderName, this != $leader1, location == $loc) then $result.addPassedRule(leaders in same location); update($result); end rule "leaders king and heir" salience 10 when $result : RuleResult(rulesPassed not contains "leaders king and heir") $leaderName : String() $king : LeaderTypeImpl(name == "King") $heir : LeaderTypeImpl(name == "Heir") $leader1 : LeaderImpl(name == $leaderName, leaderType == $king) $leader2 : LeaderImpl(name != $leaderName, this != $leader1, leaderType == $heir) then $result.addPassedRule("leaders king and heir"); update($result); end rule "leader in capital" salience 10 when $result : RuleResult(rulesPassed not contains "leader in capital") $loc : LocationImpl(capital == true) $leader1 : LeaderImpl(location == $loc) then $result.addPassedRule("leader in capital"); update($result); end rule "leader in homeland" salience 10 when $result : RuleResult(rulesPassed not contains "leader in homeland") $loc : LocationImpl(homeland == true) $leader1 : LeaderImpl(location == $loc) then $result.addPassedRule("leader in homeland"); update($result); end rule "abdication allowed" when $result : RuleResult (rulesPassed not contains "abdication allowed" && rulesPassed contains "leaders in same location" && rulesPassed contains "leaders king and heir") then $result.addPassedRule("abdication allowed"); update($result); end ------------------------------ *From:* rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] *On Behalf Of *Edson Tirelli *Sent:* Tuesday, October 30, 2007 2:31 PM *To:* Rules Users List *Subject:* Re: [rules-users] RE: JavaConsequenceBuilder.buildNullPointerException Michael, Can you show us your rule(s) please? it is raising the NPE when trying to get the list of variables you use in the consequence... as soon as we determine what the real problem is, I can fix the error message... []s Edson 2007/10/30, Michael Fuller <mfuller(a)ihets.org&gt;: I have the following code: (note String[] ruleFiles contains only one string) public class Engine { private static RuleBase ruleBase; public void start(String[] ruleFiles) throws Exception { PackageBuilderConfiguration cfg = new PackageBuilderConfiguration(); JavaDialectConfiguration javaConf = (JavaDialectConfiguration) cfg.getDialectConfiguration("java"); javaConf.setCompiler(JavaDialectConfiguration.ECLIPSE); PackageBuilder builder = new PackageBuilder(cfg); for (String file : ruleFiles) { builder.addPackageFromDrl(new InputStreamReader( ClassLoader.getSystemResourceAsStream(file))); } Package pkg = builder.getPackage(); PackageBuilderErrors errors = builder.getErrors(); if (errors.getErrors().length != 0) { // do something } RuleBaseConfiguration conf = new RuleBaseConfiguration(); conf.setAssertBehaviour( RuleBaseConfiguration.AssertBehaviour.EQUALITY); ruleBase = RuleBaseFactory.newRuleBase(); ruleBase.addPackage(pkg); ruleBase.newStatefulSession(false); } } At the builder.addPackageFromDrl(new InputStreamReader( ClassLoader.getSystemResourceAsStream(file))); line I'm getting the following exception: java.lang.NullPointerException at org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build( JavaConsequenceBuilder.java:54) at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java :67) at org.drools.compiler.PackageBuilder.addRule( PackageBuilder.java:446) at org.drools.compiler.PackageBuilder.addPackage( PackageBuilder.java:304) at org.drools.compiler.PackageBuilder.addPackageFromDrl( PackageBuilder.java:167) at myPackage.rivoli.service.rules.Engine.start(Engine.java:33) at myPackage.rivoli.rules.LeaderKingAndHeirTest.setUp( LeaderKingAndHeirTest.java:26) at com.intellij.rt.execution.junit.JUnitStarter.main( JUnitStarter.java:40) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:25) at com.intellij.rt.execution.application.AppMain.main( AppMain.java:90) I am using Drools 4.0.3 I have the following jars in my class path: antlr-runtime-3.0.jar core-3.2.3.v_686_R32x.jar drools-compiler-4.0.3.jar drools-core-4.0.3.jar mvel14-1.2.10.jar Any ideas would be helpful. Thanks. Michael Fuller "In theory there is no difference between theory and practice. But, in practice, there is." - Jan L.A. van de Snepscheut _______________________________________________ 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 -- 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