Re: [rules-users] java.lang.NullPointerException at org.drools.reteoo.ReteooFactHandleFactory.newFactHandle(ReteooFactHandleFactory.java:56)
The stack trace you provided doesn't look right to me.
1) If the insert is from the execution of a rule, more org.drools.*
trace entries should precede the lines with insert() calls.
2) According to the trace, Drools code is entered with a call to
org.drools.common.NamedEntryPoint.insert() at
NamedEntryPoint.java in line 48 but there is absolutely no executable code
anywhere near line 48 in this file, let alone a call to insert().
Did you modify the trace?
Is method SituationManager.createAccessControlEvent() just composing
and returning an AccessControlEvent object?
-W
On 23/07/2012, Carolina Pellecchia <carolina.pellecchia(a)gmail.com> wrote:
Is there anybody that can help ME with this issue, please?
Regards,
Carolina
2012/7/20 Carolina Pellecchia <carolina.pellecchia(a)gmail.com>
> *Hi everyone! *
>
> *I'm loading from Guvnor5.3.0 the pkg below ** into my application. *
>
>
>
> *package* org.dfms.model;
>
>
>
> *import* org.dfms.model.observation.ACObservation;
>
> *import* org.dfms.model.situation.AccessControlEvent;
>
> *import* org.dfms.model.situation.SituationManager;
>
> *import* org.dfms.model.situation.Event;
>
> *import* org.dfms.model.mapfeature.AccessControlPoint;
>
>
>
>
>
> *import* java.util.HashSet;
>
> *import* java.util.ArrayList;
>
>
>
> *declare* ACObservation
>
> @role(event)
>
> *end*
>
>
>
> *declare* AccessControlEvent
>
> @role(event)
>
> *end*
>
>
>
> *rule* "AccessControl"
>
> *no-loop*
>
> *when*
>
> $obs : ACObservation( $sensorid : sensorId, $location :
> location ) over window:length(1) *from* entry-point access_control
>
> *then*
>
> *insert*( SituationManager.createAccessControlEvent( $obs,
> "Access
> Control Detection", Event.THREAT_NO, $location, $sensorid ));
>
> *end*
>
>
>
> *When the rule is executed the application get this exception:*
>
>
> [*java*] ERROR [2012-07-20 14:32:17,422] [Thread-19] (*
> ExpertSystemManager.java:162*) - *java.lang.NullPointerException*
>
> [*java*] *java.lang.NullPointerException*
>
> [*java*] at
> org.drools.reteoo.ReteooFactHandleFactory.newFactHandle(*
> ReteooFactHandleFactory.java:56*)
>
> [*java*] at
> org.drools.common.AbstractFactHandleFactory.newFactHandle(*
> AbstractFactHandleFactory.java:80*)
>
> [*java*] at
> org.drools.common.AbstractFactHandleFactory.newFactHandle(*
> AbstractFactHandleFactory.java:65*)
>
> [*java*] at org.drools.common.NamedEntryPoint.createHandle(*
> NamedEntryPoint.java:720*)
>
> [*java*] at org.drools.common.NamedEntryPoint.insert(*
> NamedEntryPoint.java:280*)
>
> [*java*] at org.drools.common.NamedEntryPoint.insert(*
> NamedEntryPoint.java:116*)
>
> [*java*] at org.drools.common.NamedEntryPoint.insert(*
> NamedEntryPoint.java:48*)
>
> [*java*] at
> org.tass.utils.ExpertSystemManager.insertObservation(*
> ExpertSystemManager.java:156*)
>
> [*java*] at org.tass.vsensor.ExpertVS.dataAvailable(*
> ExpertVS.java:59*)
>
> [*java*] at gsn.beans.InputStream.executeQuery(*
> InputStream.java:277*)
>
> [*java*] at gsn.beans.StreamSource.windowSlided(*
> StreamSource.java:325*)
>
> [*java*] at
> gsn.beans.windowing.SQLViewQueryRewriter.dataAvailable(*
> SQLViewQueryRewriter.java:83*)
>
> [*java*] at
> gsn.beans.windowing.TupleBasedSlidingHandler.dataAvailable(*
> TupleBasedSlidingHandler.java:56*)
>
> [*java*] at gsn.wrappers.AbstractWrapper.postStreamElement(*
> AbstractWrapper.java:222*)
>
> [*java*] at
> gsn.http.rest.LocalDeliveryWrapper.writeStreamElement(*
> LocalDeliveryWrapper.java:147*)
>
> [*java*] at
> gsn.http.rest.DefaultDistributionRequest.deliverStreamElement(*
> DefaultDistributionRequest.java:57*)
>
> [*java*] at gsn.DataDistributer.flushStreamElement(*
> DataDistributer.java:165*)
>
> [*java*] at
> gsn.DataDistributer.run(*DataDistributer.java:220*)
>
> [*java*] at java.lang.Thread.run(*Thread.java:662*)
>
> *How can I solve this issue?*
> *
>
> Thank you in advance,
> Carolina Pellecchia*
>