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>I haven't taken a look at GWT but I know of at least one ex-Googler that was trying to do a startup in Java/GWT and was hitting some major roadblocks/slowness of dev speed; they've since switched to RoR.

That is a bit odd, its a bit like saying you couldn't get Dojo to scale so you switched to Postgres. I assume if their startup was happy with ajax idioms in RoR, then they would be mad to build it in anything else, as it does so much for you (but if you stray too far, ouch).

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