When play application is run, it says "WebJarsExtractor" not found using sbt-native-packager 0.7.2

[indykish]

sbt-native-packager 0.7.2 fails to pull the WebJarsExtractor.

This happens both in play 2.3.1 and 2.3.2-RC2
Here is my project source : https://github.com/megamsys/megam_gateway.git

I can run succesufly with sbt-native-packager : 0.7.2-RC2

[debug] n.s.e.Cache - Initialised cache: play
[debug] n.s.e.c.ConfigurationHelper - CacheDecoratorFactory not configured for defaultCache. Skipping for 'play'.
[info] application - Megam Play 0.1 App - started
[info] play - Application started (Dev)
[info] a.e.s.Slf4jLogger - Slf4jLogger started

Failure with sbt-native-packager 0.7.2

scala.MatchError: java.lang.NoClassDefFoundError: Could not initialize class org.webjars.WebJarExtractor (of class java.lang.NoClassDefFoundError)
     play.PlayReloader$$anon$1$$anonfun$play$PlayReloader$$anon$$taskFailureHandler$1.apply(PlayReloader.scala:229)
     play.PlayReloader$$anon$1$$anonfun$play$PlayReloader$$anon$$taskFailureHandler$1.apply(PlayReloader.scala:229)
     scala.Option.map(Option.scala:145)
     play.PlayReloader$$anon$1.play$PlayReloader$$anon$$taskFailureHandler(PlayReloader.scala:229)
     play.PlayReloader$$anon$1$$anonfun$reload$2.apply(PlayReloader.scala:89)
     play.PlayReloader$$anon$1$$anonfun$reload$2.apply(PlayReloader.scala:89)
     scala.util.Either$LeftProjection.map(Either.scala:377)
     play.PlayReloader$$anon$1.reload(PlayReloader.scala:89)
     play.core.ReloadableApplication$$anonfun$get$1.apply(ApplicationProvider.scala:107)
     play.core.ReloadableApplication$$anonfun$get$1.apply(ApplicationProvider.scala:105)
     scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
     scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
     scala.concurrent.forkjoin.ForkJoinTask$AdaptedRunnableAction.exec(ForkJoinTask.java:1361)
     scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
     scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
     scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)

• I have tried to remove the dependencies with twitter, and build my own classes.
• My build.sbt

 "org.webjars" %% "webjars-play" % "2.3.0",
 "org.webjars" % "webjars-locator" % "0.16",
 "com.typesafe" %% "webdriver" % "1.0.0",

[muuki88]

Duplicates #291

A workaround is to a this to your plugins.sbt

libraryDependencies ++= Seq(
    "org.slf4j" % "slf4j-api"       % "1.7.7" force(),
    "org.slf4j" % "slf4j-nop"       % "1.7.7" force(),
    "org.slf4j" % "slf4j-jdk14"     % "1.7.7" force(),
    "org.slf4j" % "jcl-over-slf4j"  % "1.7.7" force()
)

This has already been added to the current master in play:
playframework/playframework#3194

[indykish]

Ok. thanks. I moved up to 2.3.2 play and added your fix in plugins.sbt

That worked.