Could not find or load main class

I’m not sure but I found unexpected behavior after compilation Scala 3 code with SBT. build.sbt looks like:

name := "scala-cheat-sheet"
version := "1.0"
scalaVersion := "3.0.0"

Compile/mainClass := Some("com.okarmusk.Main")

The main object is located under src/main/scala/com/okarmusk and looks like:

package com.okarmusk

object Main {
  def main(args: Array[String]): Unit = {
    println("Hello world!")
  }
}

I sequentially run commands:

• sbt clean
• sbt package
• scala target/scala-3.0.0/scala-cheat-sheet_3-1.0.jar

As the result I obtained:

Error: Could not find or load main class target.scala-3.0.0.scala-cheat-sheet_3-1.0.jar
Caused by: java.lang.ClassNotFoundException: target.scala-3.0.0.scala-cheat-sheet_3-1.0.jar

Problem exists on scala 3 version Scala code runner version 3.0.1-RC1 -- Copyright 2002-2021, LAMP/EPFL, on scala 2 example works as expected.

OS: xubuntu 20.04 sbt: 1.5.2 scala: 3.0.1 RC

Issue exists also in official scala 3.0.0 version

It is worth to notice that when I run sbt run the program executes correctly.

[SethTisue]

but in this issue I want to underline, that issue exists on pure scala 3 binary, not wrapped by snips sdk or any other stuff

(that would be appropriate as a comment on the other ticket)

[okarmusk]

I’ve created issue on sbt repo and it was redirect as scala 3 issue. For more information, please check #6541. I’ve been terrified when I saw such kind of error, especially when I switched back to scala 2 and everything works.