NullPointerException when executing rule sample

Hi!

I have somewhat non-standard running environment - springsource sever. Because spring requires everything to be provided as bundle, i created drools bundle. I unpacked (extract) all drools jar-s except drools-clips, drools-jsr94 and drools-process-enterprise into single directory, and then created one big jar. Then i converted this jar using bnd utility to bundle. Because springsource uses older antlr, i did copy antlr-runtime-3.1.1 into bundle, to classes inside use this version.

In eclipse i created new project, and created helloworld sample. I did manage successfully to execute RuleFlowTest! But, DroolsTest fails with:

[2009-02-26 17:18:35.245] server-dm-8 System.err E org.drools.runtime.rule.ConsequenceException: java.lang.NullPointerException
[2009-02-26 17:18:35.245] server-dm-8 System.err E at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23)
[2009-02-26 17:18:35.245] server-dm-8 System.err E at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:935)
[2009-02-26 17:18:35.245] server-dm-8 System.err E at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:882)
[2009-02-26 17:18:35.246] server-dm-8 System.err E at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1072)
[2009-02-26 17:18:35.246] server-dm-8 System.err E at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:616)
[2009-02-26 17:18:35.246] server-dm-8 System.err E at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:583)
[2009-02-26 17:18:35.246] server-dm-8 System.err E at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:151)
[2009-02-26 17:18:35.246] server-dm-8 System.err E at com.sample.DroolsTest.main(DroolsTest.java:33)
[2009-02-26 17:18:35.246] server-dm-8 System.err E at com.sample.Runner.init(Runner.java:16)
[2009-02-26 17:18:35.247] server-dm-8 System.err E at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[2009-02-26 17:18:35.247] server-dm-8 System.err E at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
[2009-02-26 17:18:35.247] server-dm-8 System.err E at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[2009-02-26 17:18:35.247] server-dm-8 System.err E at java.lang.reflect.Method.invoke(Method.java:597)
[2009-02-26 17:18:35.248] server-dm-8 System.err E at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1414)
[2009-02-26 17:18:35.248] server-dm-8 System.err E at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1375)
[2009-02-26 17:18:35.248] server-dm-8 System.err E at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1335)
[2009-02-26 17:18:35.248] server-dm-8 System.err E at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:473)
[2009-02-26 17:18:35.248] server-dm-8 System.err E at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
[2009-02-26 17:18:35.248] server-dm-8 System.err E at java.security.AccessController.doPrivileged(Native Method)
[2009-02-26 17:18:35.249] server-dm-8 System.err E at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
[2009-02-26 17:18:35.249] server-dm-8 System.err E at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
[2009-02-26 17:18:35.249] server-dm-8 System.err E at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
[2009-02-26 17:18:35.249] server-dm-8 System.err E at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
[2009-02-26 17:18:35.250] server-dm-8 System.err E at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
[2009-02-26 17:18:35.250] server-dm-8 System.err E at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
[2009-02-26 17:18:35.250] server-dm-8 System.err E at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
[2009-02-26 17:18:35.250] server-dm-8 System.err E at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728)
[2009-02-26 17:18:35.251] server-dm-8 System.err E at org.springframework.osgi.context.support.AbstractDelegatedExecutionApplicationContext.completeRefresh(AbstractDelegatedExecutionApplicationContext.java:288)
[2009-02-26 17:18:35.251] server-dm-8 System.err E at org.springframework.osgi.extender.internal.dependencies.startup.DependencyWaiterApplicationContextExecutor$CompleteRefreshTask.run(DependencyWaiterApplicationContextExecutor.java:145)
[2009-02-26 17:18:35.252] server-dm-8 System.err E at com.springsource.server.kernel.dm.ContextPropagatingTaskExecutor$2.run(ContextPropagatingTaskExecutor.java:82)
[2009-02-26 17:18:35.252] server-dm-8 System.err E at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
[2009-02-26 17:18:35.252] server-dm-8 System.err E at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
[2009-02-26 17:18:35.253] server-dm-8 System.err E at java.lang.Thread.run(Thread.java:619)
[2009-02-26 17:18:35.253] server-dm-8 System.err E Caused by: java.lang.NullPointerException
[2009-02-26 17:18:35.254] server-dm-8 System.err E at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:926)
[2009-02-26 17:18:35.254] server-dm-8 System.err E ... 31 more

Drools file which is executed is:

package com.sample

import com.sample.DroolsTest.Message;

rule "Hello World"
when
m : Message( status == Message.HELLO, message : message )
then
System.out.println( "Ssssss" );
m.setMessage( "Goodbye cruel world" );
m.setStatus( Message.GOODBYE );
update( m );
end

rule "GoodBye"
when
Message( status == Message.GOODBYE, message : message )
then
System.out.println( message );
end

And DroolsTest java is also unmodified:

package com.sample;

import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderError;
import org.drools.builder.KnowledgeBuilderErrors;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.io.ResourceFactory;
import org.drools.logger.KnowledgeRuntimeLogger;
import org.drools.logger.KnowledgeRuntimeLoggerFactory;
import org.drools.runtime.StatefulKnowledgeSession;

/**

• This is a sample class to launch a rule.
  */
  public class DroolsTest {

public static final void main(String[] args) {
try

{ // load up the knowledge base KnowledgeBase kbase = readKnowledgeBase(); StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession(); KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "test"); // go ! Message message = new Message(); message.setMessage("Hello World"); message.setStatus(Message.HELLO); ksession.insert(message); ksession.fireAllRules(); logger.close(); }

catch (Throwable t)

{ t.printStackTrace(); }

}

private static KnowledgeBase readKnowledgeBase() throws Exception {
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"), ResourceType.DRL);
KnowledgeBuilderErrors errors = kbuilder.getErrors();
if (errors.size() > 0) {
for (KnowledgeBuilderError error: errors)

{ System.err.println(error); }

throw new IllegalArgumentException("Could not parse knowledge.");
}
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
return kbase;
}

public static class Message {

public static final int HELLO = 0;
public static final int GOODBYE = 1;

private String message;

private int status;

public String getMessage()

{ return this.message; }

public void setMessage(String message)

{ this.message = message; }

public int getStatus()

{ return this.status; }

public void setStatus(int status)

{ this.status = status; }

}

}

I did try to browse trough source and try to find out what the problem could be, but at no avail.