Session Expiration Handling

[me...@investorservicing.natixis.fr]

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Hi all,
I would like to write an Interceptor that will handle the session 
expiration.
If somone has already written something like that, thanks to tell me how.
If not here is my idea.

my interceptor will retrieve the session. A private method will tell me if 
the session is still valid.
here is an extract:

public String intercept(ActionInvocation invocation) throws Exception
        {
        Map session = invocation.getInvocationContext().getSession();
        if(isSessionExpired(session))
                {
                        return Constants.SESSION_EXPIRED_ACTION;
                } 
        else
                {
                        return invocation.invoke();
                }

        }

        private boolean isSessionExpired(Map session)
        {
        return true;
        }

When I put an object in the session (in the first action that is called 
for example),
is there a way to test if the session is still valid ?

any help is greetly appreciated.

Meissa


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