[rules-users] classLoader issue...

[Edson Tirelli]

   It seems to me that the problem is not with the classloader of your
classes, but the classpath of the drools jars. Are you sure you updated and
have all the required new jars in your classpath? Drools 5 has a few new
jars, like drools-api, that need to be available. Also, check if there are
any older jar still in the classpath that might be clashing with the new
jars.

   []s
   Edson

2009/7/1 Julien Nicoulaud <julien.nicoulaud at bull.net>

> Hi, I'm migrating my system from Drools 4.0.7 to Drools 5.1.0.
> Now when I try to compile rules that check fact fields, I get the
> following exception:
>
>        ERROR: EventDispatcher: Error during dispatch.
>        (java.lang.NoClassDefFoundError:
>        org/drools/base/extractors/BaseObjectClassFieldReader)
>        java.lang.NoClassDefFoundError:
>        org/drools/base/extractors/BaseObjectClassFieldReader
>
>        ( http://paste2.org/p/296380 )
>
>
> It seems the classloaders I pass to the configurations are not taken in
> account... I get exactly the same error if I do not specify the
> classloaders. Here is the code:
>        KnowledgeBuilderConfiguration kBuilderCfg =
>
>  KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(null,classLoader);
>        KnowledgeBuilder knowledgeBuilder =
>        KnowledgeBuilderFactory.newKnowledgeBuilder(kBuilderCfg);
>
>        KnowledgeBaseConfiguration kbaseConfig =
>
>  KnowledgeBaseFactory.newKnowledgeBaseConfiguration(null,multiBundleClassLoader);
>        kbaseConfig.setOption(EventProcessingOption.STREAM);
>        knowledgeBase =
>        KnowledgeBaseFactory.newKnowledgeBase(kbaseConfig);
>
> On Drools 4, we did exactly the same with PackageBuilder instead of
> KnowledgeBuilder and RuleBase for KnowledgeBase. So the classloaders I
> pass are the good ones... Is there some trick ?
>
> Thanks for any help !
>
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>



-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss by Red Hat @ www.jboss.com
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