[rules-users] RE: JavaConsequenceBuilder.build NullPointerException

[Edson Tirelli]

   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
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