[bmelton]

This.

One of my developers is crazy about GWT, and has shoe-horned it into a number of apps that he's primed, and it's proven to be problematic for a number of reasons.

The main problem we have is that a lot of our apps fit into a larger portal, so we have to worry a LOT more about JavaScript and CSS collisions, and generated JS/CSS just doesn't work well for that. Outside of a portalized environment, it might not be THAT bad, but for us, it's proven painful.

In the event that you find yourself duplicating your server side code and client side code, or writing excessive form validation to match server-side constraints, something like GWT is probably the way to go.