I'm seeing the error message below in jboss-head when running ejb3. The problem is that jboss-head is using hibernate 3.2.4.SP1_CP01-brew while it doesn't look like hibernate core was updated to use jbosscache-2.x until 3.3? http://lists.jboss.org/pipermail/hibernate-commits/2007-May/001261.html 20:38:02,934 ERROR [AbstractKernelController] Error installing to Start: name=persistence.units:jar=ejbthree832.jar,unitName=tempdb state=Create java.lang.NoClassDefFoundError: org/jboss/cache/TransactionManagerLookup at java.lang.Class.getDeclaredConstructors0(Native Method) at java.lang.Class.privateGetDeclaredConstructors(Class.java:2357) at java.lang.Class.getConstructor0(Class.java:2671) at java.lang.Class.newInstance0(Class.java:321) at java.lang.Class.newInstance(Class.java:303) at org.hibernate.cfg.SettingsFactory.createCacheProvider(SettingsFactory.java:375) at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:245) at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2009) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1292) at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:918) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:656) at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:127) at org.jboss.ejb3.entity.PersistenceUnitDeployment.start(PersistenceUnitDeployment.java:258) -- xxxxxxxxxxxxxxxxxxxxxxxxxxxx Adrian Brock Chief Scientist JBoss, a division of Red Hat xxxxxxxxxxxxxxxxxxxxxxxxxxxx