The Seam component model was developed for use with event-driven applications, specifically to enable the development of fine-grained, loosely-coupled components in a fine-grained eventing model. Events in Seam come in several types, most of which we have already seen:

All of these various kinds of events are mapped to Seam components via JSF EL method binding expressions. For a JSF event, this is defined in the JSF template:

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

For a jBPM transition event, it is specified in the jBPM process definition or pageflow definition:

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

You can find out more information about JSF events and jBPM events elsewhere. Lets concentrate for now upon the two additional kinds of events defined by Seam.