Play 2.9.0-M6, Scala 3.3.0, SBT 1.9.2 library conflicts

[polydevuk]

Just used g8 to setup a Play project using Play 2.9.0-M6, Scala 3.3.0 & SBT 1.9.2 but I'm getting library conflict errors:

[error] java.lang.RuntimeException: found version conflict(s) in library dependencies; 
[error] some are suspected to be binary incompatible:
[error]
[error] 	* org.scala-lang.modules:scala-xml_2.12:2.1.0 (early-semver) is selected over 1.3.0
[error] 	    +- com.typesafe.play:twirl-api_2.12:1.6.0-RC4         (depends on 2.1.0)
[error] 	    +- com.github.sbt:sbt-native-packager:1.9.16 (scalaVersion=2.12, sbtVersion=1.0) (depends on 2.1.0)
[error] 	    +- org.foundweekends.giter8:giter8-lib_2.12:0.13.1    (depends on 1.3.0)

I added this to build.sbt but to no avail:

libraryDependencySchemes += "org.scala-lang.modules" %% "scala-xml" % VersionScheme.Always
libraryDependencySchemes += "com.typesafe.play" %% "twirl-api" % VersionScheme.Always
libraryDependencySchemes += "com.github.sbt" %% "sbt-native-packager" % VersionScheme.Always
libraryDependencySchemes += "org.foundweekends.giter8" %% "giter8-lib" % VersionScheme.Always

Ok, I finally got it working. Here's how:

• Add this to project/plugins.sbt

  ThisBuild / libraryDependencySchemes += "org.scala-lang.modules" %% "scala-xml" % VersionScheme.Always
  

• Change the Scala Test dependency version:

  // libraryDependencies += "org.scalatestplus.play" %% "scalatestplus-play" % "5.1.0" % Test
  libraryDependencies += "org.scalatestplus.play" %% "scalatestplus-play" % "6.0.0-M6" % Test
  

• In IntelliJ Edit Configurations select JDK 17 as this overrides your env JAVA_HOME

• Reduce JVM options in IntelliJ project config to:

  -Xms512M -Xmx1024M -Xss1M
  

[mkurz]

When using sbt new it currently generated a Play 2.8 project, so yes you need to updated some dependencies to make things work.
However you could just run:

sbt new playframework/play-scala-seed.g8 --branch 2.9.x

Then it uses the 2.9.x branch of the scala-seed project which sets things up correctly for Play 2.9

[mkurz]

In your case you should upgrade the sbt-giter8-scaffold to 0.16.2 in your project/plugins.sbt, then you would not need libraryDependencySchemes configs, since that version comes with latest scala-xml.
But like said, just use the --branch 2.9 switch to generate the correct project.

[nemoo]

To try play 2.9, I also created a play 2.9 template via:
sbt new playframework/play-scala-seed.g8 --branch 2.9.x

In the generated files, in project/plugins.sbt, I now find something about giter8:
addSbtPlugin("org.foundweekends.giter8" % "sbt-giter8-scaffold" % "0.16.2")

I am confused. Shouldn't the generated play app just be a play app without dependencies on giter8?

[mkurz]

The filters plugin is required for scaffolding, see https://github.com/playframework/play-scala-seed.g8#scaffolding

btw, sbt new playframework/play-scala-seed.g8 is enough now to create a 2.9 project. If using SBT 1.9, sbt new does also work.