A Seam page action is an event that occurs just before we render a page. We declare page actions in WEB-INF/pages.xml. We can define a page action for either a particular JSF view id:

<pages>
    <page view-id="/hello.jsp" action="#{helloWorld.sayHello}"/>
</pages>

Or we can use a wildcard to specify an action that applies to all view ids that match the pattern:

<pages>
    <page view-id="/hello/*" action="#{helloWorld.sayHello}"/>
</pages>

If multiple wildcarded page actions match the current view-id, Seam will call all the actions, in order of least-specific to most-specific.

The page action method can return a JSF outcome. If the outcome is non-null, Seam will use the defined navigation rules to navigate to a view.

Furthermore, the view id mentioned in the <page> element need not correspond to a real JSP or Facelets page! So, we can reproduce the functionality of a traditional action-oriented framework like Struts or WebWork using page actions. For example:

TODO: translate struts action into page action

This is quite useful if you want to do complex things in response to non-faces requests (for example, HTTP GET requests).