If the event type is fully declared in DRL, the NPE does not occur.
What is the difference between DRL being compiled in the course of a
ChangeSet in contrast to being compiled by a KnowledgeBuilder?
-W
On 13 July 2011 15:05, Wolfgang Laun <wolfgang.l...@gmail.com> wrote:
> I'm pretty sure that this is a bug. When compiling a DRL from a Chenge Set,
> the resulting package
> in the Knowledge Base does not contain declare'd types that do not contain
> fields; it only contains declares with at least one field.
>
> This results in a ClassObjectTypeConf with a typeDecl == null, and the
> damage is done.
>
> I'd say that this is a show stopper for any combination of ChangeSet / Pojo
> as Event.
>
> -W
>
>
> On 12 July 2011 19:32, John <jfull...@progeny.net> wrote:
>
>> Hello,
>>
>> I've been messing with this for days now and can't get to the bottom of
>> this. I'm using drools 5.2.0 Final and setting up my KnowledgeBase with a
>> KnowledgeAgent which is pulling a package from guvnor (also 5.2.0 Final).
>> I
>> do NOT get this error if I use a KnowledgeBuilder and add the exact same
>> drl
>> file as a resource.
>>
>> If the DRL in guvnor has a rule that uses a sliding window, i get an NPE
>> when trying to insert an object and the following stack trace:
>>
>> java.lang.NullPointerException
>> at
>>
>> org.drools.reteoo.ReteooFactHandleFactory.newFactHandle(ReteooFactHandleFactory.java:56)
>> at
>>
>> org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:80)
>> at
>>
>> org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:65)
>> at
>> org.drools.common.NamedEntryPoint.createHandle(NamedEntryPoint.java:705)
>> at
>> org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:282)
>> at
>>
>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:905)
>> at
>>
>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:864)
>> at
>>
>> org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:255)
>> at john.DroolsError.runRules(DroolsError.java:48)
>> at john.DroolsError.main(DroolsError.java:40)
>>
>> Here is the DRL:
>>
>> 1. | package drools
>> 2. | import simple.SimpleType
>> 3. |
>> 4. |
>> 5. |
>> 6. |
>> 7. |
>> 8. |
>> 9. | import simple.SimpleType;
>> 10. |
>> 11. | declare SimpleType
>> 12. | @role(event)
>> 13. | end
>> 14. |
>> 15. | rule "timer"
>> 16. | timer (cron:5/5 * * * * ?)
>> 17. | when
>> 18. | $newest : Number()
>> 19. | from accumulate( SimpleType ($num : number) over
>> window:time(5s),
>> 20. | max($num) )
>> 21. | $st : SimpleType( number == $newest.intValue )
>> 22. | then
>> 23. | System.out.println("SimpleType: " + $st.number);
>> 24. | end
>> (note: the first import of simple.SimpleType comes from the package
>> configuration in guvnor, the second is in the drl file itself. the file
>> will
>> not validate without the import explicitly listed there, saying the type
>> is
>> not declared as an event...)
>>
>> Here is the Java code:
>>
>> ResourceChangeScannerConfiguration sconf = ResourceFactory
>> .getResourceChangeScannerService()
>> .newResourceChangeScannerConfiguration();
>> sconf.setProperty("drools.resource.scanner.interval",
>> "20");
>>
>> ResourceFactory.getResourceChangeScannerService().configure(sconf);
>>
>> KnowledgeBaseConfiguration config = KnowledgeBaseFactory
>> .newKnowledgeBaseConfiguration();
>> config.setOption(EventProcessingOption.STREAM);
>>
>> KnowledgeAgentConfiguration aconf = KnowledgeAgentFactory
>> .newKnowledgeAgentConfiguration();
>> aconf.setProperty("drools.agent.scanDirectories", "true");
>> aconf.setProperty("drools.agent.scanResources", "true");
>> aconf.setProperty("drools.agent.newInstance", "false");
>> KnowledgeBase kbase =
>> KnowledgeBaseFactory.newKnowledgeBase(config);
>> KnowledgeAgent kagent =
>> KnowledgeAgentFactory.newKnowledgeAgent(
>> "drools agent", kbase, aconf);
>>
>> String urlString =
>> "
>> http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/drools/LATEST/ChangeSet.xml
>> ";
>> try {
>> URL url = new URL(urlString);
>> UrlResource urlResource = (UrlResource)
>> ResourceFactory
>> .newUrlResource(url);
>> urlResource.setBasicAuthentication("enabled");
>> urlResource.setUsername("John");
>> urlResource.setPassword("");
>> kagent.applyChangeSet(urlResource);
>> } catch (Exception e) {
>> System.out.println("Caught exception: " +
>> e.getMessage());
>> e.printStackTrace();
>> }
>>
>> ResourceFactory.getResourceChangeNotifierService().start();
>> ResourceFactory.getResourceChangeScannerService().start();
>>
>> StatefulKnowledgeSession ksession =
>> kbase.newStatefulKnowledgeSession();
>> System.out.println("Initialize drools complete");
>>
>> SimpleType simp = new SimpleType();
>> simp.setNumber(5);
>>
>> ksession.insert(simp);
>>
>> Thanks,
>> John
>>
>> --
>> View this message in context:
>> http://drools.46999.n3.nabble.com/NPE-on-fact-insertion-if-rule-has-sliding-window-tp3163261p3163261.html
>> Sent from the Drools: User forum mailing list archive at Nabble.com.
>> _______________________________________________
>> rules-users mailing list
>> rules-users@lists.jboss.org
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>>
>
>
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