Using Dojo with a jMaki Widget

A very good solution for a Java developer to include AJAX in a web application could be to use jMaki. This technology allows to write JSP and JSF wrapping a widget (i.e. from Dojo) and avoiding to deal with JavaScript directly. What are the advantages for a Java developer that decides to learn JavaScript? Does a Java Dojo wrapper like jMaki really use all Dojo features? Could be any limit?

Every empty I've ever seen to wrap up Dojo in some way that allows Java developers to not have to touch JavaScript have been... less than successful. Also speaking as someone who created a library to abstract Java developers away from JavaScript (the AjaxParta Taglib), I think there's something to be said for the general approach, but also in general I think it tends to not be worth the effort.

When you're first getting into Ajax I think something like AjaxParts Taglib can be helpful... and adding Ajax to an existing Java application is an area where it also can be helpful... but when you get to the point where you're really trying to develop a modern RIA, I think you just need to get into JavaScript, regardless of what library you choose (or no library at all if you want).