As I wrote in this topic I need to invoke some action when user close or change page. I thought I could use @PreDestroy in my view scoped bean, but it is never called (even when session expires). Is this a bug? I use Glassfish 3.1.2.
Any other suggestions how can I call bean method when user leave page? Is javascript window.onunload good idea?
Even if the bean is view scoped, it's the container's responsibility to decide when to collect and destroy unused resources.
The annotations used for defining a scope indicate how long a managed bean has to survive, but you are not guaranteed about when they'll be destroyed.
As you have suggested, JavaScript can be a solution for your problem. See also this answer: How to detect unsaved data in form when user leaves the page?