Chapter 7. Events, interceptors and exception handling

To complement the contextual component model, there are two further basic concepts that facilitate the extremely loose coupling distinctive of Seam applications. The first is a strong event model, where events are mapped to event listeners with method-binding expressions like those in JavaServer Faces (JSF). The second is the pervasive use of annotations and interceptors to apply cross-cutting concerns to components that implement business logic.

<h:commandButton value="Click me!" action="#{helloWorld.sayHello}"/>

<start-page name="hello" view-id="/hello.jsp"> 
    <transition to="hello"> 
    <action expression="#{helloWorld.sayHello}"/> 
    </transition> 
    </start-page>