Play 2.2.2 Heroku deploy httpclient;4.0.1 download failed - heroku

Question

Play application update runs builds/runs fine locally however Pushing to Heroku (after migrating to cedar-14) is failing with the following:
[error] (*:update) sbt.ResolveException: download failed: org.apache.httpcomponents#httpclient;4.0.1!httpclient.jar
After browsing I have tried the following to resolve the issue without any luck:
Set sbt.version to 0.13.5
The issue seems to be in Heroku's own build process.
Any help on this issue would be greatly appreciated.
DUMP:
remote: [info] [SUCCESSFUL ] org.scala-lang#jline;2.10.3!jline.jar (11ms)
remote: [warn] ::::::::::::::::::::::::::::::::::::::::::::::
remote: [warn] :: FAILED DOWNLOADS ::
remote: [warn] :: ^ see resolution messages for details ^ ::
remote: [warn] ::::::::::::::::::::::::::::::::::::::::::::::
remote: [warn] :: org.apache.httpcomponents#httpclient;4.0.1!httpclient.jar
remote: [warn] ::::::::::::::::::::::::::::::::::::::::::::::
remote: sbt.ResolveException: download failed: org.apache.httpcomponents#httpclient;4.0.1!httpclient.jar
Build.sbt
name := "jmpdb"
version := "1.0-SNAPSHOT"
libraryDependencies ++= Seq(
javaJdbc,
javaEbean,
cache,
"mysql" % "mysql-connector-java" % "5.1.18",
"org.mindrot" % "jbcrypt" % "0.3m",
"com.thoughtworks.xstream" % "xstream" % "1.4.7",
"org.apache.velocity" % "velocity" % "1.7",
"commons-lang" % "commons-lang" % "2.6",
"com.google.api-client" % "google-api-client" % "1.12.0-beta",
"com.google.http-client" % "google-http-client-jackson" % "1.12.0-beta",
"com.google.oauth-client" % "google-oauth-client" % "1.12.0-beta",
"com.google.apis" % "google-api-services-drive" % "v2-rev30-1.12.0-beta",
"com.google.apis" % "google-api-services-oauth2" % "v2-rev25-1.12.0-beta",
"org.json" % "json" % "20080701",
"org.reflections" % "reflections" % "0.9.8",
"com.ecwid" % "ecwid-mailchimp" % "1.3.0.7",
"com.typesafe" %% "play-plugins-mailer" % "2.1.0"
)
resolvers += "jBCrypt Repository" at "http://repo1.maven.org/maven2/org/"
resolvers += "google-api-services" at "http://google-api-client-libraries.appspot.com/mavenrepo"
resolvers := Seq("typesafe" at "http://repo.typesafe.com/typesafe/repo")
// Only needed in development
javaOptions ++= Seq("-Xmx512M", "-Xmx2048M", "-XX:MaxPermSize=2048M")
play.Project.playJavaSettings
Plugins.sbt
// Comment to get more information during initialization
logLevel := Level.Warn
// The Typesafe repository
resolvers += "Typesafe repository" at "http://repo.typesafe.com/typesafe/releases/"
// Use the Play sbt plugin for Play projects
addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.2.2")

Answer 1

After consulting with Heroku technical support the issue was related to a corruption in the SBT cache on Heroku. The steps suggested below resolved the issue (in my case the purge_cache as I had already been running sbt_clean=true):
$ heroku config:set SBT_CLEAN=true
$ git push heroku master
If that still does not work, please try purging the ivy2 and m2 caches by running these commands:
$ heroku plugins:install https://github.com/heroku/heroku-repo.git
$ heroku repo:purge_cache -a peaceful-mountain-6737
$ git push heroku master
Hopefully, this will help someone else going in circles.