[rules-users] java.lang.NullPointerException at:kbuilder.add(ResourceFactory.newByteArrayResource(drl.getBytes()), ResourceType.DRL)

[misge_]

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;
  } 
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