How to handle session expiration and ViewExpiredException in JSF 2?

Question

Consider the following scenario. I am clicking the submit button of a JSF form, after the session has timed out(expired). The browser displays some exception message:

Answer 1

To handle the exception whenever the user invokes a synchronous POST request on a page while the HTTP session has been expired and the JSF view state saving method is set to server, add an <error-page> to the web.xml which catches the JSF ViewExpiredException and shows the home page.

<error-page>
    <exception-type>javax.faces.application.ViewExpiredException</exception-type>
    <location>/home.xhtml</location>
</error-page>

To handle the exception on asynchronous (ajax) requests as well, you need to implement a custom ExceptionHandler as answered in Session timeout and ViewExpiredException handling on JSF/PrimeFaces ajax request

See also:

• javax.faces.application.ViewExpiredException: View could not be restored