Jay Thanks for your reply. I was just looking into the dw forums and I found the same link. I even changed the server class loader from multiple to single and made parent last, still no luck. BTW I am just running the sample booking jpa example that came with jboss seam 2.0.1. One more note I am running this on a windows , that should n't matter anyway. Here are few snippets from my systemout.log [2/6/08 10:22:11:812 CST] 0000000a JPAComponentI I CWWJP0026I: The Java Persistence API (JPA) component is initializing. [2/6/08 10:22:11:843 CST] 0000000a JPAComponentI I CWWJP0006I: The com.ibm.websphere.persistence.PersistenceProviderImpl class is loaded as the default Java Persistence API (JPA) provider. [2/6/08 10:22:11:843 CST] 0000000a JPAComponentI I CWWJP0027I: The Java Persistence API (JPA) component has initialized. [2/6/08 10:28:31:640 CST] 0000000a JPAComponentI I CWWJP0028I: The Java Persistence API (JPA) component is starting. [2/6/08 10:28:31:671 CST] 0000000a JPAComponentI I CWWJP0017I: The Java Persistence API (JPA) component has started. [2/6/08 10:28:38:125 CST] 00000016 Initializatio I org.jboss.seam.init.Initialization addComponentDescriptor two components with same name, higher precedence wins: org.jboss.seam.persistence.persistenceProvider org.jboss.seam.Component Component: bookingDatabase, scope: APPLICATION, type: JAVA_BEAN, class: org.jboss.seam.persistence.EntityManagerFactory [2/6/08 10:28:39:234 CST] 00000016 Component I org.jboss.seam.Component Component: org.jboss.seam.persistence.persistenceProvider, scope: STATELESS, type: JAVA_BEAN, class: org.jboss.seam.persistence.HibernatePersistenceProvider [2/6/08 10:28:39:703 CST] 00000016 WebApp E Exception caught while initializing context java.lang.ClassCastException: org.apache.openjpa.persistence.PersistenceProviderImpl incompatible with javax.persistence.spi.PersistenceProvider View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4127084#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...