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@70d0d127]//
// eventListener 1::: ==>[KnowledgeBaseUpdatedEvent:
org.drools.impl.KnowledgeBaseImpl@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@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@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
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