[2.2-scala] onStart is called twice ?! (run & start)

[Otto]

Hi,

I've just upgraded our project to Play 2.2 and apparently, both in run and start, the onStart method is triggered twice:

[success] Compiled in 380ms

Go 2013-10-11T16:09:28.000+02:00

[info] application - MongoDBConnectionConfig(localhost,4040,ua,None)

[info] play - Starting application default Akka system.

[info] application - Running app in CR-Mode: Dev

Go 2013-10-11T16:09:28.686+02:00

[info] application - MongoDBConnectionConfig(localhost,4040,ua,None)

[info] application - Running app in CR-Mode: Dev

[info] play - Application started (Dev)

Any Idea?

Thanks,
Otto

[Johan Andren]

Start play in debug mode and set a breakpoint to see how the call stack looks, what caused the onStart invocation!

[Otto]

Hm,

I've tried that and the callstacks seem to be similar, screenshots attached. This error occurred after the update to 2.2.

Otto

[Johan Andren]

Yupp. Certainly looks identical, so I guess it is the app restart that is triggered multiple times for some reason.

You doing any special sbt stuff with the build, like custom resource processing, js compiler etc?

[Otto]

Nothing spectecular:

import sbt._
import Keys._
import play.Project._

object ApplicationBuild extends Build {

  val appName = "reactor"

 val appVersion = "0.1-SNAPSHOT"

 scalaVersion := "2.10.2"

  val main = play.Project(appName, appVersion, Seq()).settings(

    Keys.fork in (Test) := false,

   // Add your own project settings here      
     libraryDependencies ++= Seq(

     //cache, // somehow already imported by dependency?!

     rogueField,

     rogueCore,

     rogueIndex,

     rogueLift,

     liftMongoRecord,

     scrypt,

     opencsv,

     enumFormSupport,

     email))

 //

  // -- external dependencies

 //

 // TODO find out who's importing: exclude("org.scala-stm", "scala-stm_2.10.0")

 // MONGODB

 val rogueField = "com.foursquare" %% "rogue-field" % "2.2.0" intransitive () exclude ("org.scala-stm", "scala-stm_2.10.0")

 val rogueCore = "com.foursquare" %% "rogue-core" % "2.2.0" intransitive () exclude ("org.scala-stm", "scala-stm_2.10.0")

 val rogueIndex = "com.foursquare" %% "rogue-index" % "2.2.0" intransitive () exclude ("org.scala-stm", "scala-stm_2.10.0")

 val rogueLift = "com.foursquare" %% "rogue-lift" % "2.2.0" intransitive () exclude ("org.scala-stm", "scala-stm_2.10.0")

 val liftMongoRecord = "net.liftweb" %% "lift-mongodb-record" % "2.5" exclude ("org.scala-stm", "scala-stm_2.10.0")

 // Scrypt - Password hashing

 val scrypt = "com.lambdaworks" % "scrypt" % "1.3.2" // https://github.com/wg/scrypt

 // OpenCSV

 val opencsv = "net.sf.opencsv" % "opencsv" % "2.1"

 // EnumSupport

 val enumFormSupport = "se.radley" %% "play-plugins-enumeration" % "1.0.2" exclude ("org.scala-stm", "scala-stm_2.10.0")

 // Email

 val email = "com.typesafe" %% "play-plugins-mailer" % "2.2.0" exclude ("org.scala-stm", "scala-stm_2.10.0")

}

[Otto]

Ok, i think i found the error. Probably this occurs when you depend on a plugin which is build against an older play version, not totally sure about that.

But adding exclude("play", "*") did the trick.

val email = "com.typesafe" %% "play-plugins-mailer" % "2.2.0" exclude ("org.scala-stm", "scala-stm_2.10.0") exclude("play", "*")

Otto