Thanks for your answer ! My configuration seems correct to me, I have all new jars in the classpath (the ones indicated in the file README-DEPENDENCIES.txt at the SVN trunk). I checked them all looking after another BaseObjectClassFieldReader class, but only drools-core contains it. By the way, rules are well compiled and executed, this issue only happens when I put constraints on fields. So I think if drools-core was not in the classpath, nothing would work at all... Le mercredi 01 juillet 2009 à 08:46 -0400, Edson Tirelli a écrit : > > 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 ! > > _______________________________________________ > rules-users mailing list > rules-users at lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > > > -- > Edson Tirelli > JBoss Drools Core Development > JBoss by Red Hat @ www.jboss.com > _______________________________________________ > rules-users mailing list > rules-users at lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users