I have the problem that the DRL file is correctly loaded (i can see it at my system out with the content). But when it comes to this line: kbuilder.add(ResourceFactory.newByteArrayResource(drl.getBytes()), ResourceType.DRL); I have tried also the : // kbuilder.add(ResourceFactory.newInputStreamResource(finp), ResourceType.DRL); // kbuilder.add(ResourceFactory.newFileResource(path), ResourceType.DRL); but I have always the following stacktrace: java.lang.NullPointerException at org.drools.compiler.PackageBuilder.preCompileAddFunction(PackageBuilder.java:1112) at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:619) at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:290) at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:488) at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:25) at kn.ms.monitoring.utils.DroolsUtil.createKnowledgeBase(DroolsUtil.java:65) at kn.ms.monitoring.utils.DroolsUtil.getStatefulKnowledgeSession(DroolsUtil.java:79) at kn.ms.monitoring.Main.make(Main.java:32) at kn.ms.monitorjms.wrapper(monitorjms.java:48) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.wm.app.b2b.server.JavaService.baseInvoke(JavaService.java:439) at com.wm.app.b2b.server.invoke.InvokeManager.process(InvokeManager.java:635) at com.wm.app.b2b.server.util.tspace.ReservationProcessor.process(ReservationProcessor.java:46) at com.wm.app.b2b.server.invoke.StatisticsProcessor.process(StatisticsProcessor.java:44) at com.wm.app.b2b.server.invoke.ServiceCompletionImpl.process(ServiceCompletionImpl.java:232) at com.wm.app.b2b.server.invoke.ValidateProcessor.process(ValidateProcessor.java:51) at com.wm.app.b2b.server.invoke.PipelineProcessor.process(PipelineProcessor.java:171) at com.wm.app.b2b.server.ACLManager.process(ACLManager.java:272) at com.wm.app.b2b.server.invoke.DispatchProcessor.process(DispatchProcessor.java:30) at com.wm.app.b2b.server.AuditLogManager.process(AuditLogManager.java:386) at com.wm.app.b2b.server.invoke.InvokeManager.invoke(InvokeManager.java:539) at com.wm.app.b2b.server.invoke.InvokeManager.invoke(InvokeManager.java:384) at com.wm.app.b2b.server.ServiceManager.invoke(ServiceManager.java:234) at com.wm.app.b2b.server.BaseService.invoke(BaseService.java:189) at com.wm.lang.flow.FlowInvoke.invoke(FlowInvoke.java:324) at com.wm.lang.flow.FlowState.invokeNode(FlowState.java:584) at com.wm.lang.flow.FlowState.step(FlowState.java:444) at com.wm.lang.flow.FlowState.invoke(FlowState.java:409) at com.wm.app.b2b.server.FlowSvcImpl.baseInvoke(FlowSvcImpl.java:1057) at com.wm.app.b2b.server.invoke.InvokeManager.process(InvokeManager.java:635) at com.wm.app.b2b.server.util.tspace.ReservationProcessor.process(ReservationProcessor.java:46) at com.wm.app.b2b.server.invoke.StatisticsProcessor.process(StatisticsProcessor.java:44) at com.wm.app.b2b.server.invoke.ServiceCompletionImpl.process(ServiceCompletionImpl.java:232) at com.wm.app.b2b.server.invoke.ValidateProcessor.process(ValidateProcessor.java:51) at com.wm.app.b2b.server.invoke.PipelineProcessor.process(PipelineProcessor.java:171) at com.wm.app.b2b.server.ACLManager.process(ACLManager.java:272) at com.wm.app.b2b.server.invoke.DispatchProcessor.process(DispatchProcessor.java:30) at com.wm.app.b2b.server.AuditLogManager.process(AuditLogManager.java:386) at com.wm.app.b2b.server.invoke.InvokeManager.invoke(InvokeManager.java:539) at com.wm.app.b2b.server.invoke.InvokeManager.invoke(InvokeManager.java:384) at com.wm.app.b2b.server.ServiceManager.invoke(ServiceManager.java:234) at com.wm.app.b2b.server.comm.DefaultServerRequestHandler.handleMessage(DefaultServerRequestHandler.java:119) at com.wm.app.b2b.server.HTTPMessageHandler.process(HTTPMessageHandler.java:160) at com.wm.app.b2b.server.HTTPDispatch.handleRequest(HTTPDispatch.java:190) at com.wm.app.b2b.server.Dispatch.run(Dispatch.java:359) at com.wm.util.pool.PooledThread.run(PooledThread.java:131) at java.lang.Thread.run(Thread.java:619) This is the impl: private static KnowledgeBase createKnowledgeBase() throws Exception { KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); // kbuilder.add(ResourceFactory.newClassPathResource("validation.drl", ISubscriptionService.class), ResourceType.DRL ); if (kbuilder == null) { throw new Exception("Drools :-( "); } File drlFile =new File(""); String path = drlFile.getAbsolutePath()+"/packages/KN_MS_MONITOR_JMS/config/validation.drl"; drlFile = new File(path); FileInputStream finp=new FileInputStream(drlFile); if (ResourceFactory.newInputStreamResource(finp) == null) { throw new Exception("Cannot load file:"+path); } String drl = ConfigManager.getContents(drlFile); System.err.println(drl); kbuilder.add(ResourceFactory.newByteArrayResource(drl.getBytes()), ResourceType.DRL); // kbuilder.add(ResourceFactory.newClassPathResource("http://127.0.0.1:5552/web/KN_MS_WEBRESOURCES/validation.drl", ISubscriptionService.class), ResourceType.DRL ); // kbuilder.add(ResourceFactory.newInputStreamResource(finp), ResourceType.DRL); // kbuilder.add(ResourceFactory.newFileResource(path), ResourceType.DRL); KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(); kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() ); System.out.println("BasicRulesTesting.createKnowledgeBase()"); return kbase; } -- View this message in context: http://n3.nabble.com/java-lang-NullPointerException-at-kbuilder-add-Resou... 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