Tom Muldoon [https://community.jboss.org/people/tmuldo] created the discussion "Is optimistic-entity an inappropriate configuration for a Hibernate 2nd level cache configuration?" To view the discussion, visit: https://community.jboss.org/message/731346#731346 -------------------------------------------------------------- After upgrading jgroups from 2.5.1 to 2.7.0GA, we encountered ClassNotFoundExceptions that we tracked down to class loader issues between swarmcache (our Hibernate 2^nd^ level cache provider) and jgroups. To make a long story short, we’re now attempting a cut over to jboss cache. Some specifics… JBoss AS 5.1.0.GA hibernate-jbosscache2-3.3.1.GA jbosscache-core 3.2.5GA With that said, here’s my hibernate configuration in which we ran into DataVersioningExceptions with queries… {code:xml} <property name=+"hibernate.cache.use_second_level_cache"+ value=+"true"+ /> <property name=+"hibernate.cache.use_query_cache"+ value=+"true"+ /> <property name=+"hibernate.cache.region.jbc2.query.localonly"+ value=+"true"+ /> <property name=+"hibernate.cache.region.factory_class"+ value=+"org.hibernate.cache.jbc2.MultiplexedJBossCacheRegionFactory"+ /> <property name=+"hibernate.cache.region_prefix"+ value=+"hibernate.firstbest"+ /> {code} Is optimistic-entity an inappropriate configuration for a Hibernate 2^nd^ level cache configuration? Assuming so, how do we deal with the DataVersioningExceptions? Is mvcc-entity a more appropriate configuration? Sincerely, Tom -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/731346#731346] Start a new discussion in JBoss Cache at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]