[rules-users] RE: JavaConsequenceBuilder.buildNullPointerException

[Edson Tirelli]

   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 at ihets.org>:
>
>  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 at lists.jboss.org [mailto:
> rules-users-bounces at 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 at ihets.org>:
>
> 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 at 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 at 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
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