[rules-users] classLoader issue...

[Julien Nicoulaud]

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 !