[jboss-jira] [JBoss JIRA] Commented: (JBRULES-1982) NullPointerException when executing rule sample
Edson Tirelli (JIRA)
jira-events at lists.jboss.org
Wed Mar 11 22:16:23 EDT 2009
[ https://jira.jboss.org/jira/browse/JBRULES-1982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12456826#action_12456826 ]
Edson Tirelli commented on JBRULES-1982:
----------------------------------------
I don't have your environment so it is hard to say what is wrong. Although, my guess given the line number where the NPE is being raised is that you had a problem compiling the consequence of the rules and so the consequence object is null.
My suggestion is double check that you have the proper version of the JDT compiler in your classpath, or configure the test program to use Janino and add janino to your classpath.
> NullPointerException when executing rule sample
> -----------------------------------------------
>
> Key: JBRULES-1982
> URL: https://jira.jboss.org/jira/browse/JBRULES-1982
> Project: JBoss Drools
> Issue Type: Bug
> Security Level: Public(Everyone can see)
> Affects Versions: 5.0.0.M5
> Environment: Springsource DM Server v.1.0.1, all jar-s bundled together in single jar file, then converted to bundle using bnd utility
> Reporter: Hrvoje Habjanic
> Assignee: Mark Proctor
>
> 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.
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