Today I decided to upgrade from Play Frame­work 2.0.4 to the newly released 2.1.0.

I fol­lowed their help­ful guide: http://​www​.playframe​work​.com/​d​o​c​u​m​e​n​t​a​t​i​o​n​/​2​.​1​.​0​/​M​i​g​r​a​t​ion

Here is a list of the prob­lems I had, and how I solved them:

1. When it says change the import in the Build.scala to 

   import play.Project._

   Don’t for­get the “play.”

2. It says that “the mainLang para­me­ter for the project is not required any­more” — but it really means remove it.
3. I also had to Google to fig­ure how to update this dependency:

   "com.typesafe" %% "play-plugins-mailer" % "2.1-RC2"

4. I also ended up hav­ing to update the depen­den­cies for Dead­bolt as well to the following:

   "be.objectify" %% "deadbolt-core" % "2.1-SNAPSHOT",
   "be.objectify" %% "deadbolt-java" % "2.1-SNAPSHOT",

Oth­er­wise, fol­low the instruc­tions — the rest was pretty straight forward.

I also used a pull request from the PVM (Play Ver­sion Man­ager) to down­load and switch Play Frame­work Versions.

If you have read this far, you may as well fol­low me on Twit­ter:
Fol­low @poornerd