"jaikiran" wrote : anonymous wrote : 16:54:21,973 ERROR [[/DexCenterQueueing2-war]] StandardWrapper.Throwable | | java.lang.NoClassDefFoundError: net/sf/hibernate/HibernateException | | at java.lang.Class.forName0(Native Method) | | at java.lang.Class.forName(Class.java:169) | | at au.edu.qut.yawl.engine.interfce.InterfaceB_EnvironmentBasedServer.init(InterfaceB_Environ | | mentBasedServer.java:52 | | This seems to be coming from the au.edu.qut.yawl.engine.interfce.InterfaceB_EnvironmentBasedServer class. Make sure you are importing the correct version of hibernate classes. Hibernate3 i packaged in org.hibernate.* whereas the earlier version of Hibernate was net.sf.* Thanks, Jaikiran. I was able to solve this problem. Now I do have trouble with the EJB3 Timer Service. I have a post out there, but I have not got any response yet. Any help is appreciated here. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4194829#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...