[jboss-jira] [JBoss JIRA] Commented: (JBRULES-1982) NullPointerException when executing rule sample
Jasper Siepkes (JIRA)
jira-events at lists.jboss.org
Thu Oct 15 07:51:06 EDT 2009
[ https://jira.jboss.org/jira/browse/JBRULES-1982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12489998#action_12489998 ]
Jasper Siepkes commented on JBRULES-1982:
-----------------------------------------
Hi all!
I independently of Hrvoje did the same thing; Merge the API, Core and Compiler Jars in to one OSGI'fied jar and try to use it in a Spring DM OSGI environment. After getting some wierd results (I got the same nullpointer exception Hrvoje got) I thought I had somehow messed up my rules file. After I ruled out the possibility of my rules file being busted I did some googling and I ended up here.
So I can confirm that using Drools in a Spring DM and OSGI environment breaks the 'java' dialect, 'mvel' does work. I tried to use the 'java' dialect with the Janino compiler btw.
> NullPointerException when executing rule sample
> -----------------------------------------------
>
> Key: JBRULES-1982
> URL: https://jira.jboss.org/jira/browse/JBRULES-1982
> Project: 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
> Priority: Minor
>
> 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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