[rules-users] No errors thrown from KnowledgeAgent

De Rooms Brecht bderooms at vub.ac.be
Thu Sep 19 06:29:17 EDT 2013 

Dear Davide

thank you very much for looking into this.
I was wondering, are these kind of bugs also there in the commercial 
edition or is that a completely different implementation?

Kind Regards,
De Rooms Brecht

Op 19/09/2013 10:46, Davide Sottara schreef:
> It is a bug, the KA can detect compilation errors in resources, but 
> will not capture runtime exceptions.
> I have opened a ticket, It will be fixed in 5.6 and 6.x
> Davide
>
> On 09/17/2013 01:51 PM, De Rooms Brecht wrote:
>> Dear Drools users,
>> Apparently it was not caused by the previously mentioned fix. 
>> Sometimes I still had a KnowledgeAgent in my server that doesn't 
>> respond anymore which seems to be caused by a mistake in the DRL file.
>> I started to investigate the source code of KnowledgeAgentImpl and 
>> KnowledgeBaseImpl and recompiled them to add some prints. Finally I 
>> tracked it until AbstractRuleBase.addPackages.
>>
>> There is a giant Try-final block and I noticed by adding prints that 
>> it stopped somewhere in the middle. When it does fail, my 
>> KnowledgeAgent stops working completely.
>> The try-final seemed to be the only place for me where an exception 
>> might be ignored so I added a catch clause.
>> As a result, the error report of my drl file was nicely printed and 
>> my agent didn't crash:
>>
>> *org.drools.RuntimeDroolsException: Unable to resolve class 'int' for 
>> global 'RULES_MATCHED'
>>     at 
>> org.drools.common.AbstractRuleBase.mergePackage(AbstractRuleBase.java:818)
>>     at 
>> org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:615)
>>     at 
>> org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:472)
>>     at 
>> org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:153)
>>     at 
>> org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:1173)
>>     at 
>> org.drools.agent.impl.KnowledgeAgentImpl.incrementalBuildResources(KnowledgeAgentImpl.java:1058)
>>     at 
>> org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:738)
>>     at 
>> org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:259)
>>     at 
>> org.drools.agent.impl.KnowledgeAgentImpl$ChangeSetNotificationDetector.run(KnowledgeAgentImpl.java:1357)
>>     at 
>> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
>>     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
>>     at java.util.concurrent.FutureTask.run(FutureTask.java:166)
>>     at 
>> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
>>     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
>>     at java.util.concurrent.FutureTask.run(FutureTask.java:166)
>>     at 
>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>>     at 
>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>>     at java.lang.Thread.run(Thread.java:722)
>> *
>> Maybe there is a reason for this missing catch so I am not sure 
>> whether I fixed it and broke something else ( eg. maybe I should undo 
>> a part of the operations before I continue).
>> Is there anyone who knows this code and who can help me?
>>
>> Extra information:
>>     - I use Drools 5.5 from the Maven repository.
>>     - my agent configuration:
>> agentConf.setProperty("drools.agent.newInstance", "false");
>> agentConf.setProperty("drools.agent.useKBaseClassLoaderForCompiling", 
>> "true");
>>
>>
>> Kind Regards,
>> De Rooms Brecht
>>
>> Op 31/07/2013 14:45, De Rooms Brecht schreef:
>>> The bug was caused by one of the InputStreams that was not closed 
>>> properly which caused the knowledgeAgent to block.
>>> I think my issues are solved now.
>>>
>>> Thanks for looking into this.
>>> Kind Regards,
>>>
>>> Op 31/07/2013 14:19, De Rooms Brecht schreef:
>>>> Hello David and thanks for responding.
>>>> I know it supports these event listeners and I use them. In my 
>>>> program, I have two knowledge agents and the first one 
>>>> (preprocessing) will read the file, preprocess a DRL and then write 
>>>> a second modified DRL file in a folder that is monitored by the 
>>>> second one. When I modify the original DRL file *(1.* in prints 
>>>> below*)* monitored by the preprocessing agent, everything works 
>>>> fine and the rule is triggered*(**2.)*. However, when I delete a 
>>>> file *(**3.)*, the knowledgeAgent just blocks after 
>>>> AfterChangeSetAppliedEvent and does not do anything anymore.. If I 
>>>> send new data in the knowledgeAgent it does not react anymore.
>>>>
>>>> I would expect to get a stacktrace of what went wrong but I do not 
>>>> get any info besides of the systemeventlistener or 
>>>> knowledgeagentlistener. Is there any way I can get a stacktrace?
>>>> Kind Regards,
>>>> De Rooms Brecht
>>>>
>>>> _*1. Resources Changed => Modified:  [[FileResource 
>>>> file='knowledge\realtimeKnowledge\test.brules.testRule.drl']]*_
>>>> /    eventListener 1::: 
>>>> ==>[BeforeResourceProcessedEvent(RESOURCE_REMOVED): [FileResource 
>>>> file='knowledge\realtimeKnowledge\test.brules.testRule.drl']]//
>>>> //    eventListener 1::: 
>>>> ==>[AfterResourceProcessedEvent(RESOURCE_REMOVED): [FileResource 
>>>> file='knowledge\realtimeKnowledge\test.brules.testRule.drl']]//
>>>> //    eventListener 1::: ==>[AfterChangeSetProcessedEvent: 
>>>> ChangeSetImpl{resourcesRemoved=[], resourcesAdded=[], 
>>>> resourcesModified=[[FileResource 
>>>> file='knowledge\realtimeKnowledge\test.brules.testRule.drl']], 
>>>> knowledgeDefinitionsRemoved=[]}]//
>>>> //    eventListener 1::: ==>[ResourceCompilationFailedEvent: 
>>>> org.drools.builder.impl.KnowledgeBuilderImpl at 70d0d127]//
>>>> //    eventListener 1::: ==>[KnowledgeBaseUpdatedEvent: 
>>>> org.drools.impl.KnowledgeBaseImpl at 49669be]//
>>>> //    eventListener 1::: ==>[AfterChangeSetAppliedEvent: 
>>>> ChangeSetImpl{resourcesRemoved=[], resourcesAdded=[], 
>>>> resourcesModified=[[FileResource 
>>>> file='knowledge\realtimeKnowledge\test.brules.testRule.drl']], 
>>>> knowledgeDefinitionsRemoved=[]}]//
>>>> //    eventListener 2::: ==>[BeforeChangeSetAppliedEvent: 
>>>> ChangeSetImpl{resourcesRemoved=[], resourcesAdded=[], 
>>>> resourcesModified=[[FileResource 
>>>> file='knowledge\packaged\test.brules.testRule.drl']],     
>>>> knowledgeDefinitionsRemoved=[]}]//
>>>> //    eventListener 2::: 
>>>> ==>[BeforeResourceProcessedEvent(RESOURCE_REMOVED): [FileResource 
>>>> file='knowledge\packaged\test.brules.testRule.drl']]//
>>>> //    eventListener 2::: 
>>>> ==>[AfterResourceProcessedEvent(RESOURCE_REMOVED): [FileResource 
>>>> file='knowledge\packaged\test.brules.testRule.drl']]//
>>>> //    eventListener 2::: ==>[AfterChangeSetProcessedEvent: 
>>>> ChangeSetImpl{resourcesRemoved=[], resourcesAdded=[], 
>>>> resourcesModified=[[FileResource 
>>>> file='knowledge\packaged\test.brules.testRule.drl']], 
>>>> knowledgeDefinitionsRemoved=[]}]//
>>>> //    eventListener 2::: ==>[KnowledgeBaseUpdatedEvent: 
>>>> org.drools.impl.KnowledgeBaseImpl at 11c834d1]/
>>>>
>>>> _*2. Rules are triggered when the PKG file its knowledge is updated:*_
>>>> /    Changed This Rule::: Got Event: TestEvent( number=5, 
>>>> message=doesDynamicEventTypeWork? )//
>>>> //    Changed This Rule::: Got Event: TestEvent( number=4, 
>>>> message=doesDynamicEventTypeWork? )//
>>>> //    Changed This Rule::: Got Event: TestEvent( number=2, 
>>>> message=doesDynamicEventTypeWork? )//
>>>> //    Changed This Rule::: Got Event: TestEvent( number=1, 
>>>> message=doesDynamicEventTypeWork? )//
>>>> //    Changed This Rule::: Got Event: TestEvent( number=2, 
>>>> message=doesDynamicEventTypeWork? )//
>>>> //    Changed This Rule::: Got Event: TestEvent( number=1, 
>>>> message=doesDynamicEventTypeWork? )//
>>>> //    Changed This Rule::: Got Event: TestEvent( number=2, 
>>>> message=doesDynamicEventTypeWork? )//
>>>> //    Changed This Rule::: Got Event: TestEvent( number=1, 
>>>> message=doesDynamicEventTypeWork? )//
>>>> //
>>>> //    eventListener 2::: ==>[AfterChangeSetAppliedEvent: 
>>>> ChangeSetImpl{resourcesRemoved=[], resourcesAdded=[], 
>>>> resourcesModified=[[FileResource 
>>>> file='knowledge\packaged\test.brules.testRule.drl']],         
>>>> knowledgeDefinitionsRemoved=[]}]//
>>>> //    eventListener 1::: ==>[BeforeChangeSetAppliedEvent: 
>>>> ChangeSetImpl{resourcesRemoved=[[FileResource 
>>>> file='knowledge\realtimeKnowledge\test.brules.testRule.drl']], 
>>>> resourcesAdded=[], resourcesModified=[], 
>>>> knowledgeDefinitionsRemoved=[]}]//
>>>> //    eventListener 1::: ==>[BeforeChangeSetProcessedEvent: 
>>>> ChangeSetImpl{resourcesRemoved=[[FileResource 
>>>> file='knowledge\realtimeKnowledge\test.brules.testRule.drl']], 
>>>> resourcesAdded=[], resourcesModified=[], 
>>>> knowledgeDefinitionsRemoved=[]}]/
>>>>
>>>>
>>>> _*3. *__*Resources Changed => *__*Removed:   [[FileResource 
>>>> file='knowledge\realtimeKnowledge\test.brules.testRule.drl']]*_
>>>> /    eventListener 1::: 
>>>> ==>[BeforeResourceProcessedEvent(RESOURCE_MODIFIED): [FileResource 
>>>> file='knowledge\realtimeKnowledge\test.brules.testRule.drl']]//
>>>> //    eventListener 1::: 
>>>> ==>[AfterResourceProcessedEvent(RESOURCE_MODIFIED): [FileResource 
>>>> file='knowledge\realtimeKnowledge\test.brules.testRule.drl']]//
>>>> //    eventListener 1::: ==>[AfterChangeSetProcessedEvent: 
>>>> ChangeSetImpl{resourcesRemoved=[[FileResource 
>>>> file='knowledge\realtimeKnowledge\test.brules.testRule.drl']], 
>>>> resourcesAdded=[], resourcesModified=[], 
>>>> knowledgeDefinitionsRemoved=[]}]//
>>>> //    eventListener 1::: ==>[KnowledgeBaseUpdatedEvent: 
>>>> org.drools.impl.KnowledgeBaseImpl at 49669be]//
>>>> //    eventListener 1::: ==>[AfterChangeSetAppliedEvent: 
>>>> ChangeSetImpl{resourcesRemoved=[[FileResource 
>>>> file='knowledge\realtimeKnowledge\test.brules.testRule.drl']], 
>>>> resourcesAdded=[], resourcesModified=[], 
>>>> knowledgeDefinitionsRemoved=[]}]/
>>>>
>>>>  .... and then it was quiet....
>>>>
>>>> Op 31/07/2013 09:42, Davide Sottara schreef:
>>>>> The KA logs to a SystemEventListener, and supports a dedicated event
>>>>> listener for
>>>>> additions/updates/etc...
>>>>>
>>>>> You can do:
>>>>>
>>>>> kagent.setSystemEventListener( new PrintStreamSystemEventListener() );
>>>>> kagent.addEventListener( new DebugKnowledgeAgentEventListener(  ) );
>>>>>
>>>>>
>>>>>
>>>>> On 07/30/2013 01:55 AM, De Rooms Brecht wrote:
>>>>>> Dear Drools users,
>>>>>>
>>>>>> I have been testing with the KnowledgeAgent from version 5.4 and 5.5. It
>>>>>> monitors a changeset and is set to incrementally build the
>>>>>> knowledgebase. I noticed that it sometimes crashes but never throws out
>>>>>> errors. This happens for example when I define a type two times and when
>>>>>> I remove a file. Does anyone experience similar behaviour and has an
>>>>>> idea of how I could see the errors? I already tried to check the errors
>>>>>> by building it myself using a knowledgebuilder before I update the file
>>>>>> that the knowledgeAgent monitors but that's quite a dirty solution.
>>>>>>
>>>>>> Kind Regards,
>>>>>> De Rooms Brecht
>>>>>> _______________________________________________
>>>>>> rules-users mailing list
>>>>>> rules-users at lists.jboss.org
>>>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>>>
>>>>> _______________________________________________
>>>>> rules-users mailing list
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>>>>>
>>>>
>>>>
>>>>
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