[rules-users] RE: JavaConsequenceBuilder.buildNullPointerException

[Michael Fuller]

Yes it does. 

 

________________________________

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Anstis,
Michael (M.)
Sent: Tuesday, October 30, 2007 12:26 PM
To: Rules Users List
Subject: RE: [rules-users] RE:
JavaConsequenceBuilder.buildNullPointerException

 

Does the InputStream return a reference to your file?

	
________________________________


	From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Michael Fuller
	Sent: 30 October 2007 16:04
	To: rules-users at lists.jboss.org
	Subject: [rules-users] RE: JavaConsequenceBuilder.build
NullPointerException

	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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