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@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@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

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  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3529-6000
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