Looks like this class cannot be found: anonymous wrote : Caused by: java.lang.ClassNotFoundException: No ClassLoaders found for: org.jasypt.hibernate.type.EncryptedStringType Is it one of your classes (it is not part of Hibernate)? How is your application packaged? As a WAR or EAR? Is the missing class located within your app's archive, and if so, where? One of the possibilities is that the missing class is in a JAR file in the WEB-INF/lib directory of your WAR file, in which case Hibernate cannot see it because of scoping rules. Also, what version of JBoss AS and what JDK? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4199418#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...