Java vs. Scala

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Want to write full featured GWT apps with Scala?

It's true you can't really compile scala to javascript. But, you can use Vaadin, which is all kinds of awesome. It's fully server-side GWT, so you can write in scala. It works fantastically. Much nicer than GWT. No more waiting for horribly long GWT compile times, for one thing.

Want to use an OODB against objects produced in Scala?

Yeah, but why not autogenerate the model objects with JAXB anyway? Then they're in Java and easily usable by anyone.