Build error when plugin is use together with newer play framework versions (>=2.9)

[fabro122]

Edit: Solved (see comment below)

Since I wanted to use Scala 3 I tried to upgrade to Play Framework 3.0.0, but after upgrading the sbt cli fails already on startup (without providing any command or task) with an error (see below). The error occurs with Scala 2.13.12 or 3.3.1, sbt 1.9.6 or 1.9.7 and play 2.9.0 or 3.0.0. Using the newer play versions or sbt-web-scalajs with Scala 3 individually works however. The only immediate change I found between play 2.9.0 and play 2.8.x is, that Scala 2.12 support has been dropped.
Thanks for the help!

To Reproduce:

1. Create new Project from gitter template: sbt new vmunier/play-scalajs.g8
2. Change sbt play plugin to
   addSbtPlugin("org.playframework" % "sbt-plugin" % "3.0.0") or
   addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.9.0")

P.S.: I raised the issue in this repository, because I think it is the most likely one able to address it.

java.lang.NoClassDefFoundError: org/webjars/WebJarExtractor$Cache
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:534)
at java.base/java.lang.Class.forName(Class.java:513)
at sbt.internal.inc.ModuleUtilities$.getObject(ModuleUtilities.scala:24)
at sbt.internal.inc.ModuleUtilities$.getCheckedObject(ModuleUtilities.scala:32)
at sbt.internal.inc.ModuleUtilities$.$anonfun$getCheckedObjects$1(ModuleUtilities.scala:37)
at scala.collection.immutable.Stream.$anonfun$map$1(Stream.scala:418)
at scala.collection.immutable.Stream$Cons.tail(Stream.scala:1173)
at scala.collection.immutable.Stream$Cons.tail(Stream.scala:1163)
at scala.collection.generic.Growable.loop$1(Growable.scala:57)
at scala.collection.generic.Growable.$plus$plus$eq(Growable.scala:61)
at scala.collection.generic.Growable.$plus$plus$eq$(Growable.scala:53)
at scala.collection.mutable.ListBuffer.$plus$plus$eq(ListBuffer.scala:184)
at scala.collection.mutable.ListBuffer.$plus$plus$eq(ListBuffer.scala:47)
at scala.collection.TraversableLike.to(TraversableLike.scala:786)
at scala.collection.TraversableLike.to$(TraversableLike.scala:783)
at scala.collection.AbstractTraversable.to(Traversable.scala:108)
at scala.collection.TraversableOnce.toList(TraversableOnce.scala:350)
at scala.collection.TraversableOnce.toList$(TraversableOnce.scala:350)
at scala.collection.AbstractTraversable.toList(Traversable.scala:108)
at scala.collection.immutable.List.$plus$plus(List.scala:216)
at sbt.internal.PluginDiscovery$.discoverAll(PluginDiscovery.scala:59)
at sbt.internal.Load$.loadPlugins(Load.scala:1330)
at sbt.internal.Load$.loadPluginDefinition(Load.scala:1275)
at sbt.internal.Load$.buildPlugins(Load.scala:1254)
at sbt.internal.Load$.plugins(Load.scala:1233)
at sbt.internal.Load$.$anonfun$loadUnit$2(Load.scala:701)
at sbt.internal.Load$.timed(Load.scala:1407)
at sbt.internal.Load$.$anonfun$loadUnit$1(Load.scala:701)
at sbt.internal.Load$.timed(Load.scala:1407)
at sbt.internal.Load$.loadUnit(Load.scala:695)
at sbt.internal.Load$.$anonfun$builtinLoader$4(Load.scala:493)
at sbt.internal.BuildLoader$.$anonfun$componentLoader$5(BuildLoader.scala:181)
at sbt.internal.BuildLoader.apply(BuildLoader.scala:246)
at sbt.internal.Load$.loadURI$1(Load.scala:555)
at sbt.internal.Load$.loadAll(Load.scala:571)
at sbt.internal.Load$.loadURI(Load.scala:501)
at sbt.internal.Load$.load(Load.scala:480)
at sbt.internal.Load$.$anonfun$apply$1(Load.scala:242)
at sbt.internal.Load$.timed(Load.scala:1407)
at sbt.internal.Load$.apply(Load.scala:242)
at sbt.internal.Load$.defaultLoad(Load.scala:57)
at sbt.BuiltinCommands$.liftedTree1$1(Main.scala:964)
at sbt.BuiltinCommands$.doLoadProject(Main.scala:964)
at sbt.BuiltinCommands$.$anonfun$loadProjectImpl$2(Main.scala:917)
at sbt.Command$.$anonfun$applyEffect$4(Command.scala:151)
at sbt.Command$.$anonfun$applyEffect$2(Command.scala:146)
at sbt.Command$.process(Command.scala:190)
at sbt.MainLoop$.$anonfun$processCommand$5(MainLoop.scala:246)
at scala.Option.getOrElse(Option.scala:189)
at sbt.MainLoop$.process$1(MainLoop.scala:246)
at sbt.MainLoop$.processCommand(MainLoop.scala:279)
at sbt.MainLoop$.$anonfun$next$5(MainLoop.scala:164)
at sbt.State$StateOpsImpl$.runCmd$1(State.scala:290)
at sbt.State$StateOpsImpl$.process$extension(State.scala:326)
at sbt.MainLoop$.$anonfun$next$4(MainLoop.scala:164)
at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:24)
at sbt.MainLoop$.next(MainLoop.scala:164)
at sbt.MainLoop$.run(MainLoop.scala:145)
at sbt.MainLoop$.$anonfun$runWithNewLog$1(MainLoop.scala:120)
at sbt.io.Using.apply(Using.scala:28)
at sbt.MainLoop$.runWithNewLog(MainLoop.scala:113)
at sbt.MainLoop$.runAndClearLast(MainLoop.scala:67)
at sbt.MainLoop$.runLoggedLoop(MainLoop.scala:52)
at sbt.MainLoop$.runLogged(MainLoop.scala:43)
at sbt.StandardMain$.runManaged(Main.scala:225)
at sbt.xMain$.$anonfun$run$11(Main.scala:135)
at scala.util.DynamicVariable.withValue(DynamicVariable.scala:62)
at scala.Console$.withIn(Console.scala:230)
at sbt.internal.util.Terminal$.withIn(Terminal.scala:610)
at sbt.internal.util.Terminal$.$anonfun$withStreams$1(Terminal.scala:390)
at scala.util.DynamicVariable.withValue(DynamicVariable.scala:62)
at scala.Console$.withOut(Console.scala:167)
at sbt.internal.util.Terminal$.$anonfun$withOut$2(Terminal.scala:600)
at scala.util.DynamicVariable.withValue(DynamicVariable.scala:62)
at scala.Console$.withErr(Console.scala:196)
at sbt.internal.util.Terminal$.withOut(Terminal.scala:600)
at sbt.internal.util.Terminal$.withStreams(Terminal.scala:390)
at sbt.xMain$.withStreams$1(Main.scala:88)
at sbt.xMain$.run(Main.scala:123)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at sbt.internal.XMainConfiguration.run(XMainConfiguration.java:59)
at sbt.xMain.run(Main.scala:47)
at xsbt.boot.Launch$.$anonfun$run$1(Launch.scala:149)
at xsbt.boot.Launch$.withContextLoader(Launch.scala:176)
at xsbt.boot.Launch$.run(Launch.scala:149)
at xsbt.boot.Launch$.$anonfun$apply$1(Launch.scala:44)
at xsbt.boot.Launch$.launch(Launch.scala:159)
at xsbt.boot.Launch$.apply(Launch.scala:44)
at xsbt.boot.Launch$.apply(Launch.scala:21)
at xsbt.boot.Boot$.runImpl(Boot.scala:78)
at xsbt.boot.Boot$.run(Boot.scala:73)
at xsbt.boot.Boot$.main(Boot.scala:21)
at xsbt.boot.Boot.main(Boot.scala)
Caused by: java.lang.ClassNotFoundException: org.webjars.WebJarExtractor$Cache
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:593)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)

[fabro122]

After cloning and playing a bit around with the dependency versions, I found out, that with newer versions of sbt-web (1.5.3 and 1.5.4respectively) everything works fine.
I hope you could merge the PRs of @scala-steward and publish it in the near future.
Thanks!

[vmunier]

sbt-web-scalajs v1.3.0 has been released and should fix this issue.