Re: [rules-dev] [rules-users] class loading problems with 5.3.0-Final and 5.4.0-SNAPSHOT

Based on more tests and reading some articles about OSGI we (Professor dotty and I) have found that the composite class loader from drools is using Class.forName that is being intercepted by the equinox OSGI container -> at org.eclipse.core.runtime.internal.adaptor.ContextFinder.loadClass(ContextFinder.java:124) It looks like both are trying to load the same class definition and the JVM throws the ClassCircularityError. For my very basic example changing the CompositeClassLoader implementation to use: cls = classLoader.loadClass(name); instead of: cls = Class.forName( name, resolve, classLoader ); Fix the problems. But I'm not sure if that will work for all the other cases. Looking the usages of Class.forName inside compiler, core and api I found that it is being used 39 times, which worries me. I'm not planning to change all of them without being sure that is the right way to go. I will continue reading and testing to see if changing the way of loading the classes is the only alternative. Some notes about the difference between loadClass and forName: Classloader.loadClass() caches the loaded class object and returns always the same class object This is done by the defining class loader This ensures that each classloader loads the same class only once Class.forName() calls the normal classloader hierarchy to load the class (same happens as above) But caches the class object within the initiating class loader In standard cases no problem but can be tricky in dynamic environments Source -> http://www.martinlippert.org/events/WJAX2008-ClassloadingTypeVisibilityOS... On Tue, Nov 15, 2011 at 4:04 PM, Davide Sottara <dsotty(a)gmail.com&gt; wrote: > > Lovely exception... > Well, both my life and salaboy's depend on solving this issue... Mark and I > were also considering to review the Composite ClassLoader at some point in > the future, since it causes issues with (re)declared types in DRLs loaded at > runtime. Looks like we'll have to catch two birds with one stone :) > Salaboy, can you share the simple service and the WSO2 config details? > (version, any custom setting, etc...) > > -- > View this message in context: http://drools.46999.n3.nabble.com/rules-users-class-loading-problems-with... > Sent from the Drools: User forum mailing list archive at Nabble.com. > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users -- - CTO @ http://www.plugtree.com - MyJourney @ http://salaboy.wordpress.com - Co-Founder @ http://www.jugargentina.org - Co-Founder @ http://www.jbug.com.ar - Salatino "Salaboy" Mauricio - -- - CTO @ http://www.plugtree.com - MyJourney @ http://salaboy.wordpress.com - Co-Founder @ http://www.jugargentina.org - Co-Founder @ http://www.jbug.com.ar - Salatino "Salaboy" Mauricio - _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev