7:47 a.m.
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>:
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(JavaCo
nsequenceBuilder.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.jav
a:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.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
Mobile: +55 11 9287-5646
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