Well, looking at CompositeClassLoader, it's already not completely threadsafe even with the loadClass method synchronized. (This is because loadClass calls fastFindClass, which iterates over the classLoader ArrayList, which could be concurrently modified.) So the classLoader data strucure should be concurrent, and it's my guess that removing the synchronization from CompositeClassLoader.loadClass will be fine as long as the sub ClassLoaders that actually do loading are threadsafe.

--- On Thu, 9/10/09, Dave McLoughlin <Dave.McLoughlin(a)openlogic.com&gt; wrote: > From: Dave McLoughlin <Dave.McLoughlin(a)openlogic.com&gt; > Subject: [rules-users] Thread-deadlock when Negation Was Used and > NullPointerException in Drools 5.0.1 > To: rules-users(a)lists.jboss.org > Date: Thursday, September 10, 2009, 6:56 PM > > > > > > Thread-deadlock when Negation Was Used and > NullPointerException in Drools 5.0.1 > > > > > We have a couple of issues we've > submitted to the issue tracker. > > > > JBRULES-2276 <https://jira.jboss.org/jira/browse/JBRULES-2276> > > JBRULES-2267 <https://jira.jboss.org/jira/browse/JBRULES-2267> > > > > While we are waiting for the core team to take a look we > wanted to see if anyone else has run into these issues and > has any advice for us. > > > > We have provided both our diagnosis of the issues and > fixes. Our concern is whether we've taken the > right approach to the fixes and what the long term > ramifications are of the solutions. > > > > Any and all advice is welcome, > > > > > > Thanks, > > > > > > > > Dave > > > > > > > > > > > -----Inline Attachment Follows----- > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users