I add following line to the persistence-dev.xml:

<property name="hibernate.cache.provider_class" value="org.hibernate.cache.TreeCacheProvider"/>

when start the jboss, I get this error :
java.lang.RuntimeException: java.lang.NoClassDefFoundError: org/jgroups/MembershipListener
        at org.jboss.ejb3.ServiceDelegateWrapper.startService(ServiceDelegateWrapper.java:109)
        at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)


but the jgroups.jar and jboss-cache.jar is in the ear's lib directory. What's wrong?