Try again! Scala ide just got an update and at least the nightly version supports play 2.3.

The update site for eclipse kepler is

In eclipse go to project>properties>play2 and remove all the play.api.templates imports, those don't exist anymore.

ps: on a side note: i've started a google doc with notes on play+eclipse, feel free to add your own findings. Play 2.3 and Eclipse

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