[rules-users] No errors thrown from KnowledgeAgent

Davide Sottara dsotty at gmail.com
Thu Sep 19 04:46:36 EDT 2013 

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
>>>> rules-users at lists.jboss.org
>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>
>>>
>>>
>>>
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>>
>>
>>
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>
>
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