I'm having trouble getting Hibernate to work with JBossCache 2.0. I'm running on Tomcat 5.5. Could be a jar problem of some sort on my side but I was cautious about adding/updating to jbosscache 2.0. Hibernate 3.2.3.ga JBossCache 2.0.0.GA JGroups 2.6.0-beta-1 I get this error when HibernateUtil starts up: java.lang.NoClassDefFoundError: org/jboss/cache/TransactionManagerLookup | at java.lang.Class.getDeclaredConstructors0(Native Method) | at java.lang.Class.privateGetDeclaredConstructors(Unknown Source) | at java.lang.Class.getConstructor0(Unknown Source) | at java.lang.Class.newInstance0(Unknown Source) | at java.lang.Class.newInstance(Unknown Source) | at org.hibernate.cfg.SettingsFactory.createCacheProvider(SettingsFactory.java:371) | at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:241) | at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2009) It looks like SettingsFactory.createCacheProvider() is looking for a hard-coded "org.jboss.cache.TransactionManagerLookup" which in JBossCache 2.0 should probably be "org.jboss.cache.transaction.GenericTransactionManagerLookup". I'm configuring Hibernate programatically: conf.setProperty("hibernate.cache.use_second_level_cache", "true"); | conf.setProperty("hibernate.cache.provider_class", "org.hibernate.cache.TreeCacheProvider"); | conf.setProperty("hibernate.cache.use_structured_entries", "true"); | conf.setProperty("hibernate.cache.use_query_cache", "true"); | conf.setProperty("hibernate.cache.usage", "transactional"); I've searched my entire codebase and never use "TransactionManagerLookup". Question: Am I using the correct value for "hibernate.cache.provider_class" in my programmatic Hibernate configuration? Let me know if there's more info I can provide. Thanks for the help, Joe The top of my treecache.xml looks like: <mbean code="org.jboss.cache.jmx.CacheJmxWrapper" name="jboss.cache:service=TreeCache"> | <depends>jboss:service=Naming</depends> | <depends>jboss:service=TransactionManager</depends> | <attribute name="TransactionManagerLookupClass">org.jboss.cache.transaction.GenericTransactionManagerLookup</attribute> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4092670#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...