If one is going to extend an existing application that has been written using Struts, is it possible to add new functionality using Tapestry? Can the two be mixed together or do you need to either stay with Struts or rewrite the entire application using Tapestry?
Depends on what level of "integration" you're after. They both can co-exist in the same web application, no problem. Links from a Struts page into a Tapestry is no problem. Tapestry even has some JSP taglibs that create the write links/URL's more easily. But you won't really have any fun trying to tie things tighter than that, except with some sharing via application/session scope variables or GET/POST parameters. And GET/POST parameters are something Tapestry hides from you generally speaking so that is kludgy (but possible with some work) way to go.
We've gone completely with Tapestry for our latest development efforts and have not looked back. Life couldn't be better!
Erik
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