Why does sbt fail with NoClassDefFoundError: play/Play$ in Play 2.2.x projects after sbt compile in Play 2.3 project?

Question

Once I run \'sbt compile\' on a 2.3 play project, I can\'t use \'sbt compile\' to compile any Play 2.2.x projects anymore. This is the error when I run sbt command.

Answer 1

Try updating play-fork-run.sbt

addSbtPlugin("com.typesafe.play" % "sbt-fork-run-plugin" % "2.3.8")

update to

addSbtPlugin("com.typesafe.play" % "sbt-fork-run-plugin" % "2.4.0")

Then project will be able to build.