Nashorn script engine not found when running under sbt

Hi, I have previously created an issue at Play project but it seems to be more sbt related. The issue is the following. I have just upgraded to Java 8 and I want to use Nashorn. Simply put, I have two projects, one scala lib and a play project to have a GUI.

I haven’t seen the issue straight away because the scala lib uses maven but when I try to load nashorn after running play with sbt -> run, the engine is not found and if I try to do it manually (new NashornScriptEngineFactory) I get a ClassDefNotFound.

I have created a very simple test from the basics scala project.

The code I have added is the following

"Nashorn" should "be available" in {
    import javax.script._
    val manager = new ScriptEngineManager()
    val engine = manager.getEngineByName("nashorn")
    engine should not be null
  }

For play, when I create a distribution and run it from outside sbt everything works and nashorn is found.

[montaro]

I had the same problem with SBT project, and this worked for me

val engineManager: ScriptEngineManager = new ScriptEngineManager(null)
//Or
val engineManager: ScriptEngineManager = new ScriptEngineManager(getClass.getClassLoader)

[SethTisue]

re JSR 223, let’s discuss further at https://issues.scala-lang.org/browse/SI-8422