A lot of the times we have cases in web-applications where based on the user's selection, you either have to display in another part of the page,something else, or populate a table etc. Most of the time we end up either submitting the page and reloading or use some kind of hidden frame and submit and get back the results.

A lot of times that's probably good considering that you won't post again. But JSON-RPC seems like a good alternative to this wherein you can bridge your Javascript calls to Java objects etc. and using DHTML tricks do prety much a lot without having to submit your page.

Though the constraints that this framework puts on your objects, arrays etc. are a bit irritating to work on, it's probably a good alternative to small server-side logic tht might be done through this. An defintely the security bit is not developed so it not be usable for security centri applications. But for small intranet applications don't see why you can't think of it as an alternative.

How do I fit this into a Struts/JSF based application is an open question.