Each day as an AJAX developer seems to bring another helpful revelation: a new tool, a new gadget, a new way to reinvent the browser. But even when I'm confronted with a breakthrough as big as Firebug - the brilliant debugging tool for Firefox - in the back of my mind I'm reminded that the AJAX state-of-the-art is trailing behind the debugging tools that we've had in Java for years. With age comes maturity, and with Java's maturity has come a wealth of development environments, field-tested frameworks, and a rich set of strongly typed APIs.