RE: [rules-users] RE: JavaConsequenceBuilder.build NullPointerException

Does the InputStream return a reference to your file? _____ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Michael Fuller Sent: 30 October 2007 16:04 To: rules-users(a)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(JavaConseq uenceBuilder.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.jav a: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