[rules-users] Drools and OSGi
Wouter Van Isterdael
woutervanisterdael at gmail.com
Thu Apr 15 06:54:36 EDT 2010
Thank you both very much. I will try both suggestions, and will get back to
you as soon as I've got it figured out :-)
Kind regards,
Aerv
2010/4/15 Robert <robert.weissmann at web.de>
> Hi Aerv,
>
> soon I will also have to launch Drools within an OSGI environment, but I
> am not there yet. But within another context (jBPM) I had some troubles
> looking similar you are having.
>
> It had something to do with the classloading. jBPM did not provide any
> OSGI-support, whereas Droos does, so I am not sure if this fits, but I had
> to wrap here and there some classes so they got pulled in by the right
> ClassLoader (OSGI uses many class-loaders).
>
>
> final ClassLoader origCl =
> Thread.currentThread().getContextClassLoader();
> final ClassLoader cl =
> <YOUR_CLASS_YOU_WANT_TO_USE>.class.getClassLoader();
> Thread.currentThread().setContextClassLoader(cl);
>
> ... use the class ...
>
>
> Thread.currentThread().setContextClassLoader(origCl);
>
> Maybe this helps,
>
> Cheers, Rob.
>
>
> Am 14.04.2010, 20:27 Uhr, schrieb Wouter Van Isterdael
> <woutervanisterdael at gmail.com>:
>
> > I still seem to be having problems getting it working. The problem did
> > not
> > go away.
> >
> > I still get the same error. Would anyone know of a simple step-by-step
> > tutorial for using Drools in a Felix OSGi environment? Preferrably within
> > Eclipse and with Pax Runner.
> >
> > Any help would be very much appreciated.
> >
> > Thank you for your time!
> >
> > Kind regards
> >
> > Aerv
> >
> > 2010/4/6 AervTerrh <woutervanisterdael at gmail.com>
> >
> >> Thanks for the reply. I will try this tomorrow and keep you posted!
> >>
> >> 2010/4/5 Jason Davidson [via Drools - Java Rules Engine] <[hidden
> >> email]<
> http://n3.nabble.com/user/SendEmail.jtp?type=node&node=698969&i=0>
> >> >
> >>
> >>> I don't know if this helps, but I had to turn the MVEL JIT compiler
> >>> off in
> >>> the Equinox OSGi container:
> >>> OptimizerFactory.setDefaultOptimizer("reflective");
> >>>
> >>> Also, we used pre-compiled packages instead of compiling the DRL files
> >>> at
> >>> runtime. For example:
> >>>
> >>> ....
> >>> RuleBaseConfiguration ruleBaseConfig = new
> >>> RuleBaseConfiguration();
> >>>
> >>> ruleBaseConfig.setClassLoader(this.getClass().getClassLoader());
> >>>
> >>> //MVEL in OSGi is a complete CF - this turns off the MVEL
> >>> JIT
> >>> - potential resource hog but that's the nature of OSGi classloading
> >>> //and Drools...
> >>> OptimizerFactory.setDefaultOptimizer("reflective");
> >>>
> >>> RuleBase ruleBase =
> >>> RuleBaseFactory.newRuleBase(ruleBaseConfig);
> >>>
> >>> InputStream pkgIs =
> >>>
> this.getClass().getResourceAsStream("/com/cjs/hazel/rules/com.cjs.hazel.rules.pkg");
> >>> addPackage(ruleBase,pkgIs);
> >>> .....
> >>>
> >>> On Fri, Apr 2, 2010 at 4:42 PM, AervTerrh <[hidden
> >>> email]<
> http://n3.nabble.com/user/SendEmail.jtp?type=node&node=698731&i=0>
> >>> > wrote:
> >>>
> >>>>
> >>>> Hey,
> >>>>
> >>>> Okay. I know this problem can be found all over. But I can't seem to
> >>>> figure
> >>>> out a solution to it. Somehow I must be doing something wrong. I've
> >>>> created
> >>>> a simple application that evaluates some rules and changes some
> >>>> objects
> >>>> based on that. Everything worked fine, not a single problem there. All
> >>>> libraries could be easily found etc.
> >>>>
> >>>> Now I wanted to convert this to a Felix OSGi bundle.
> >>>>
> >>>> So, what I did, was creating a bundle (new plugin project based on
> >>>> existing
> >>>> jars) with the drools jars (core, compiler, api, jsr) and tried the
> >>>> next
> >>>> code in the RuleEngine class:
> >>>>
> >>>> Properties props = new Properties();
> >>>> props.setProperty("drools.dialect.java.compiler", "JANINO");
> >>>> KnowledgeBuilderConfiguration config =
> >>>> KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(props, null);
> >>>> (here's where it fails)
> >>>> KnowledgeBuilder kbuilder =
> >>>> KnowledgeBuilderFactory.newKnowledgeBuilder(config);
> >>>> kbuilder.add(ResourceFactory.newClassPathResource(fileName,
> >>>> RuleEngine.class), ResourceType.DRL);
> >>>>
> >>>> This is pretty much the loading of the rule file. The RuleEngine is
> >>>> started
> >>>> in an Activator. The file is found and everything. But I keep getting
> >>>> the
> >>>> same error when starting the bundle.
> >>>>
> >>>> org.drools.RuntimeDroolsException: Unable to load dialect
> >>>> 'org.drools.rule.builder.dialect.mvel.MVELDialectConfigurati
> >>>> on:mvel:null'
> >>>> at org.drools.compiler.PackageBuilderConfiguration.addDialect(P
> >>>> ackageBuilderConfiguration.java:274)
> >>>> at org.drools.compiler.PackageBuilderConfiguration.buildDialect
> >>>> ConfigurationMap(PackageBuilderConfiguration.java:259)
> >>>> at org.drools.compiler.PackageBuilderConfiguration.init(Package
> >>>> BuilderConfiguration.java:176)
> >>>> at
> >>>>
> >>>>
> org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:148)
> >>>> at org.drools.builder.impl.KnowledgeBuilderProviderImpl.newKnow
> >>>> ledgeBuilderConfiguration(KnowledgeBuilderProviderImpl.java: 21)
> >>>> at org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuild
> >>>> erConfiguration(KnowledgeBuilderFactory.java:68)
> >>>> at test.Activator$RuleCreator.createRule(Activator.java:52)
> >>>> at test.Activator.start(Activator.java:32)
> >>>> at org.apache.felix.framework.util.SecureAction.startActivator(
> >>>> SecureAction.java:639)
> >>>> at org.apache.felix.framework.Felix.activateBundle(Felix.java:1 700)
> >>>> at org.apache.felix.framework.Felix.startBundle(Felix.java:1622 )
> >>>> at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.j
> >>>> ava:1077)
> >>>> at org.apache.felix.framework.StartLevelImpl.run(StartLevelImpl
> >>>> .java:264)
> >>>> at java.lang.Thread.run(Unknown Source)
> >>>> Caused by: java.lang.ClassNotFoundException:
> >>>> org.drools.rule.builder.dialect.mvel.MVELDialectConfiguratio n
> >>>> at java.net.URLClassLoader$1.run(Unknown Source)
> >>>>
> >>>>
> >>>> The packages I import in the manifest:
> >>>> Import-Package: org.codehaus.janino;version="2.4.3",
> >>>> org.drools,
> >>>> org.drools.builder,
> >>>> org.drools.compiler,
> >>>> org.drools.io,
> >>>> org.drools.rule,
> >>>> org.drools.rule.builder.dialect.java,
> >>>> org.drools.rule.builder.dialect.mvel,
> >>>> org.osgi.framework;version="1.3.0"
> >>>>
> >>>> In my target platform I add the the drools project I created (with
> >>>> drools-xx.jar (the necessary ones), I also added the following:
> >>>> -ant
> >>>> -antlr-runtime
> >>>> -janino
> >>>> -jsr94
> >>>> -xstream
> >>>>
> >>>> But I can't seem to get it working... Does anyone know what can be
> >>>> done
> >>>> about this? Or a working example of Drools in Felix OSGi would also be
> >>>> helpful.
> >>>>
> >>>> Any help is very much appreciated, I've been looking into this for
> >>>> days.
> >>>>
> >>>> Thanks!
> >>>>
> >>>> Kind regards,
> >>>>
> >>>> Aerv
> >>>> --
> >>>> View this message in context:
> >>>> http://n3.nabble.com/Drools-and-OSGi-tp694011p694011.html
> >>>> Sent from the Drools - User mailing list archive at Nabble.com.
> >>>> _______________________________________________
> >>>> rules-users mailing list
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> http://n3.nabble.com/user/SendEmail.jtp?type=node&node=698731&i=1>
> >>>>
> >>>> https://lists.jboss.org/mailman/listinfo/rules-users
> >>>>
> >>>
> >>>
> >>> _______________________________________________
> >>> rules-users mailing list
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> >>>
> >>
> >>
> >>
> >> --
> >> __________________________________
> >> Van Isterdael Wouter
> >> Roesbeke 27
> >> 9402 Meerbeke
> >> 0496401476
> >>
> >> ------------------------------
> >> View this message in context: Re: Drools and
> >> OSGi<http://n3.nabble.com/Drools-and-OSGi-tp694011p698969.html>
> >>
> >> Sent from the Drools - User mailing list
> >> archive<http://n3.nabble.com/Drools-User-f47000.html>at Nabble.com.
> >>
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> >>
> >>
> >
> >
>
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__________________________________
Van Isterdael Wouter
Roesbeke 27
9402 Meerbeke
0496401476
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