Deploying Play 2.1-SNAPSHOT based application to Heroku - heroku

Question

I have a Play 2.1-SNAPSHOT based application that runs fine locally but when I try to deploy to Heroku I get the following error:
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn] :: UNRESOLVED DEPENDENCIES ::
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn] :: play#sbt-plugin;2.1-SNAPSHOT: not found
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn]
[warn] Note: Some unresolved dependencies have extra attributes. Check that these dependencies exist with the requested
attributes.
My plugins.sbt file points to a local repository containing the 2.1-SNAPSHOT dependencies:
resolvers ++= Seq(
"Typesafe repository" at "http://repo.typesafe.com/typesafe/releases/",
Resolver.file("My Repository", file( "repository/local") )
)
// Use the Play sbt plugin for Play projects
addSbtPlugin("play" % "sbt-plugin" % "2.1-SNAPSHOT")
The directory "repository/local" is checked into my GIT repository. It does look like SBT on Heroku is looking in the local repository since before the "Unresolved Dependency" error I see the following warnings:
[warn] ==== Typesafe repository: tried
[warn] http://repo.typesafe.com/typesafe/releases/play/sbt-plugin_2.9.1_0.11.2/2.1-SNAPSHOT/sbt-plugin-2.1-SNAPSHOT.pom
[warn] ==== My Repository: tried
[warn] ==== heroku-sbt-typesafe: tried
[warn] ==== heroku-central: tried
Running the command "play stage" locally finishes successfully.

Answer 1

An alternative is to add the Typesafe ivy-snapshots repository as a plugin resolver if you'd prefer to not use a local file repo.
In project/plugins.sbt:
resolvers += Resolver.url("Typesafe Ivy Snapshots", url("http://repo.typesafe.com/typesafe/ivy-snapshots/"))(Resolver.ivyStylePatterns)

Answer 2

Found the issue. I needed to declare "My Repository" as an Ivy repository by adding "Resolver.ivyStylePatterns" after the file resolver like this:
Resolver.file("My Repository", file( "repository/local/") )(Resolver.ivyStylePatterns)

Answer 3

The http://repo.typesafe.com/typesafe/ivy-snapshots/ seems no longer active, the following configuration works for me:
in your plugins.sbt:
//play sbt-plugin snapshot
resolvers += Resolver.url("Typesafe Simple Snapshots", url("https://repo.typesafe.com/typesafe/simple/snapshots/"))(Resolver.ivyStylePatterns)
//play snapshot
resolvers += "Sonatype snapshots" at "https://oss.sonatype.org/content/repositories/snapshots/"
// The Play plugin
addSbtPlugin("com.typesafe.play" %% "sbt-plugin" % "2.4-SNAPSHOT")
in your build.sbt
//play snapshot
resolvers += "Sonatype snapshots" at "https://oss.sonatype.org/content/repositories/snapshots/"