Hi, Let me explain my requirement. I have web-application with MVC architecture. which contains Contoller(JSF component) - Business Service - Data Access service- DB. now to handle exception, i am having base class at each layer. Let's say, i am having PersistenceException(DA Layer) and LoginServiceException(Business Layer). Now let's say i want to show "Invalid user/id password" error message on JSF page, how can i show it? Thnx Chintan