[rules-users] Drools and Guvnor 5.1M2 - ExceptionbeingthrowninprocessChangeSet
Esteban Aliverti
esteban.aliverti at gmail.com
Thu Jul 1 16:42:12 EDT 2010
Starting from 5.1RC1 you will be able to attach an EventListener to
KnowledgeAgent. You will be able to do the garbage collection after the
agent kbase gets updated.
I don't really know when 5.1RC1 will be available. Does anyone here know?
Best,
2010/7/1 Jeffrey Schneller <jeffrey.schneller at envisa.com>
> Thanks for the info. Is there any way that you can add a call to do
> garbage collection after the knowledge agent is refreshed? I am noticing
> that all my rules stick around for some time until garbage collection is
> actually run. If rule packages are huge, modified, and rebuilt quickly the
> scanner will pick them up and process them but if garbage collection hasn’t
> run after the last refresh then a bunch of stale objects are hanging around.
>
>
>
> I tested this by running a memory profile tool. After the rule refresh
> occurs all my rule object counts increase by 1. If I force garbage
> collection from the profile tool then all the rule object counts drop down
> to 1.
>
>
>
> Am I doing something wrong?
>
>
>
> When do you expect 5.1RC1 to be available?
>
>
>
> Thanks.
>
>
>
>
>
>
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Esteban Aliverti
> *Sent:* Thursday, July 01, 2010 1:27 PM
>
> *To:* Rules Users List
> *Subject:* Re: [rules-users] Drools and Guvnor 5.1M2 -
> ExceptionbeingthrowninprocessChangeSet
>
>
>
> The other error could be because of a bug I recently fixed:
> https://jira.jboss.org/browse/BRMS-320
>
> It should be solved in 5.1RC1 I think.
>
>
>
> Best,
>
> 2010/7/1 Jeffrey Schneller <jeffrey.schneller at envisa.com>
>
> Esteban,
>
>
>
> Here is the stack trace for the ClassNotFoundException when the compiler
> jar is not included.
>
>
>
> java.lang.ClassNotFoundException:
> org.drools.builder.impl.KnowledgeBuilderFactoryServiceImpl
>
> at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1387)
>
> at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
>
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
>
> at java.lang.Class.forName0(Native Method)
>
> at java.lang.Class.forName(Class.java:169)
>
> at
> org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:190)
>
> at
> org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.call(ServiceRegistryImpl.java:185)
>
> at
> org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:143)
>
> at
> org.drools.builder.KnowledgeBuilderFactory.loadServiceFactory(KnowledgeBuilderFactory.java:107)
>
> at
> org.drools.builder.KnowledgeBuilderFactory.getKnowledgeBuilderPServiceFactory(KnowledgeBuilderFactory.java:101)
>
> at
> org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuilder(KnowledgeBuilderFactory.java:29)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(KnowledgeAgentImpl.java:556)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(KnowledgeAgentImpl.java:541)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.incrementalBuildResources(KnowledgeAgentImpl.java:731)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:515)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:145)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:130)
>
>
>
>
>
> Any idea on why the other error is appearing. The error is
> “java.lang.RuntimeException: KnowledgeAgent exception while trying to
> deserialize KnowledgeDefinitionsPackage”. This occurs when the knowledge
> agent is created with the compiled package from the Guvnor for the first
> time.
>
>
>
> Thank you for all your work and help. Drools is a great package.
>
>
>
> Thanks.
>
>
>
>
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Esteban Aliverti
> *Sent:* Thursday, July 01, 2010 8:09 AM
>
>
> *To:* Rules Users List
> *Subject:* Re: [rules-users] Drools and Guvnor 5.1M2 - Exception
> beingthrowninprocessChangeSet
>
>
>
> Could you please provide us the line number where de ClassNotFoundException
> occurs. I think I know what could be happening. When you use incremental
> change set processing (newInstance = false), the agent use a kbuilder to
> perform some diff between the modified and original resource. The thing is
> that the agent always instantiate a kbuilder even if all the resources are
> already compiled (which is useless).
>
>
>
> Please provide me the line number of the exception, i will start working on
> this issue. Meanwhile, as a workaround, add the drools-compiler dependency.
>
> The KAgent was practically rebuilt from scratch since 5.1M1 so these kind
> of error were expected ;)
>
>
>
> Best,
>
>
>
> 2010/7/1 Jeffrey Schneller <jeffrey.schneller at envisa.com>
>
> As a follow-up, this did work however there are still some problems. The
> rules did get pulled into the application and seem to be running but clearly
> something is not right.
>
>
>
> I needed to include the drools-compiler.jar in my app otherwise I was
> getting a ClassNotFoundException. I am pulling a compiled package from the
> Guvnor so not sure why I need the compiler jar in my app.
>
>
>
> When the rules are pulled into the app I am getting the exception thrown
> which is being logged and the app can continue running:
>
>
>
> 2010-07-01 00:36:14,201 | INFO (MyDroolsListener.java:41) KnowledgeAgent
> performing an incremental build of the ChangeSet
>
> 2010-07-01 00:36:14,261 | ERROR (MyDroolsListener.java:30)
> java.lang.RuntimeException: KnowledgeAgent exception while trying to
> deserialize KnowledgeDefinitionsPackage
>
> 2010-07-01 00:36:14,261 | WARN (MyDroolsListener.java:53) KnowledgeAgent:
> The resource didn't create any package: [UrlResource path='
> http://ruleserver/drools-guvnor/org.drools.guvnor.Guvnor/package/my.rule.package/LATEST
> ']
>
> 2010-07-01 00:36:14,271 | INFO (MyDroolsListener.java:41) KnowledgeAgent
> incremental build of KnowledgeBase finished and in use
>
>
>
> Then if I rebuild the package in the Guvnor then I see the following [the
> two lines are repeated for each rule in the package]:
>
>
>
> [2010:07:182 00:07:741:debug] BinaryResourceDiffProducerImpl: Comparing
> [Rule name=v_32, agendaGroup=MAIN, salience=0, no-loop=false] against [Rule
> name=v_32, agendaGroup=MAIN, salience=0, no-loop=false]
>
> [2010:07:182 00:07:741:debug] BinaryResourceDiffProducerImpl: The rules
> have different LHS
>
>
>
>
>
> Thanks
>
>
>
>
>
>
>
>
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Esteban Aliverti
> *Sent:* Wednesday, June 30, 2010 6:35 PM
>
>
> *To:* Rules Users List
> *Subject:* Re: [rules-users] Drools and Guvnor 5.1M2 - Exception
> beingthrownin processChangeSet
>
>
>
> The problem seams to happen because the kagent can't access the url.
>
> If you try to access the change set xml using a browser, does the browser
> ask you for authentication? I don't know why, but guvnor protect its urls
> since 5.1 I think.
>
> So, basically, the error is that guvnor can't read from the url. The same
> error happens if you provide a non existent url. I need to open a jira for
> this.
>
> As a work around, try doing this:
>
>
>
> <change-set xmlns='http://drools.org/drools-5.0/change-set'
>
> xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'
>
> xs:schemaLocation='http://drools.org/drools-5.0/change-set
> drools-change-set-5.0.xsd<http://drools.org/drools-5.0/change-setdrools-change-set-5.0.xsd>'
> >
>
> <add>
>
> <resource basicAuthentication='enabled' username='admin'
> password='admin' source='
> http://ruleserver/drools-guvnor/org.drools.guvnor.Guvnor/package/my.rule.package/LATEST'
> type='PKG' />
>
> </add>
>
> </change-set>
>
>
>
>
> Remember to replace username and password.
>
>
>
> Best,
>
>
>
> 2010/6/30 Jeffrey Schneller <jeffrey.schneller at envisa.com>
>
> Here is the xml file I am getting:
>
>
>
> <change-set xmlns='http://drools.org/drools-5.0/change-set'
>
> xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'
>
> xs:schemaLocation='http://drools.org/drools-5.0/change-set
> drools-change-set-5.0.xsd<http://drools.org/drools-5.0/change-setdrools-change-set-5.0.xsd>'
> >
>
> <add>
>
> <resource source='
> http://ruleserver/drools-guvnor/org.drools.guvnor.Guvnor/package/my.rule.package/LATEST'
> type='PKG' />
>
> </add>
>
> </change-set>
>
>
>
>
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Esteban Aliverti
> *Sent:* Wednesday, June 30, 2010 3:18 PM
> *To:* Rules Users List
> *Subject:* Re: [rules-users] Drools and Guvnor 5.1M2 - Exception being
> thrownin processChangeSet
>
>
>
> Could you please post the xml file you are getting from
> http://rulerserver/drools-guvnor/org.drools.guvnor.Guvnor/package/my.rule.package/LATEST/ChangeSet.xml
> ?
>
>
>
> Best,
>
> 2010/6/30 Jeffrey Schneller <jeffrey.schneller at envisa.com>
>
> I am trying to upgrade to the 5.1M2 build from 5.0.1 and am running into
> some issues. I have installed the new 5.1 Guvnor and imported the rules
> from my 5.0.1 Guvnor instance.
>
> I then removed the old 5.0.1 drools jars from my app and replaced them with
> the 5.1M2 drools jars. I was also added all the dependent libraries. The
> code that worked with the 5.0.1 version does not work with the 5.1M2
> version. In 5.0.1 I was constructing the xml and streaming it into the
> applyChangeSet method. With 5.1M2 I am just pointing to the change set xml
> file that is in the Guvnor.
>
>
>
> I am seeing a NullPointerException being thrown in the processChangeSet
> method as shown below.
>
>
>
> Caused by: java.lang.NullPointerException
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.processChangeSet(KnowledgeAgentImpl.java:171)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:143)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:130)
>
>
>
>
>
> Did I miss something? Am I doing something wrong? Below is the code that
> I have.
>
>
>
> KnowledgeAgentConfiguration kaconf =
> KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
>
> kaconf.setProperty( "drools.agent.scanDirectories", "true"
> );
>
> kaconf.setProperty("drools.agent.newInstance", "false");
>
>
>
> ResourceFactory.getResourceChangeScannerService().start();
>
>
> ResourceFactory.getResourceChangeNotifierService().start();
>
>
>
> String url = "
> http://rulerserver/drools-guvnor/org.drools.guvnor.Guvnor/package/my.rule.package/LATEST/ChangeSet.xml
> ";
>
>
>
> KnowledgeAgent kagent =
> KnowledgeAgentFactory.newKnowledgeAgent( "Configuration", kaconf );
>
> kagent.setSystemEventListener(new MyDroolsListener());
>
> try {
>
>
> kagent.applyChangeSet(ResourceFactory.newUrlResource(new URL(url)));
> // ERROR IS OCCURING INSIDE OF applyChangeSet
>
> } catch (MalformedURLException e) {
>
> e.printStackTrace();
>
> }
>
>
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>
>
>
>
> --
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Esteban Aliverti
>
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
>
>
> --
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Esteban Aliverti
>
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
>
>
> --
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Esteban Aliverti
>
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
>
>
> --
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Esteban Aliverti
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
--
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Esteban Aliverti
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