Custom Vaadin Session Timeout Handler

Override the com.vaadin.Application#getSystemMessages() method to add custom functionality.

public class CustomApplication extends com.vaadin.Application {

 @Overrides
 public static SystemMessages getSystemMessages() {
 CustomizedSystemMessages msgs;
 msgs = new CustomizedSystemMessages();
 msgs.setSessionExpiredNotificationEnabled(false);
 msgs.setSessionExpiredURL("javascript:handleSessionTimeout();");
 return msgs;
 }

}

On the client side, you can now use JavaScript and respond to this event:

function handleSessionTimeout() {
 console.log("Foo - the session timed out!");
};

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