Jean Luc... Did you have a look at tapestry-spring-security? The repositry is at http://www.localhost.nu/java/mvn/nu/localhost/tapestry/tapestry-spring-secur ity/ but the project site seams to be down. It is rough on the edges, but works well and is not to hard to understand the code.
It would be great if this got into more mainstream somewhere so it is easy to add robust authorization to the applications we build almost all have it and will sooner or later need the things that spring-security provide. Appfuse also has an integration you could look at if you have not done so already. http://code.google.com/p/tapestry5-appfuse/ Excuse me if this was covered already in the thread. Br Peter