Hi, i use DAO pattern, all CRUD fuctions are supposed come from GenericDAO for example, in GenericDAO i defined findAll(), findById()....then , i let EmailTemplate extends GenericDAO to get such frequently used functions and these crud functions are also INVOKED in my SLSB. If the reason of this exception is i did not defined any method in my DAO session Bean, please tell me what is the pupose of this Exception, against inheritance in EJB3 world? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4106440#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...