provide a convenient way to rewrite URLs with flow execution keys

Currently, you have to rewrite all URLs by hand: constructs like "detail.html?_flowExecutionKey=${flowExecutionKey}" clutter every JSP (or other view template).

A possible SWF taglib springs to mind, with a tag similar to <c:url>.

Or perhaps a ServletFilter could override encodeUrl() to magically provide the key, similar to session URL rewriting provided by the default implementation of encodeUrl()? This way, the functionality of <c:url> would not have to be duplicated.