Web Application Platform

Hey All,

I am currently in the process of defining a web application platform to 
provide web services. We have chosen Tapestry as MVC layer. I have a few 
problems I haven't been able to resolve (at least not in an elegant way):

1) I want the whole application to be available only for logged in users. 
We have an existing framework for security. I think when a request comes 
in, the front controller servlet should check wether the user has logged 
in. If not, reroute the user to the login page. How do I do this in tapestry?

2) Authorisation is also an important part of the web app platform. I would 
like to call some java-code whenever a new page is loaded. This code should 
check wether the user is allowed to access the page. If the user does not 
have the right permissions, he is rerouted to some other page. What would 
be a good way to do this?

Thanks in advance,
Lennart



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