I'm following examples out of Programming in Scala book by Odersky and I'm unable to run a simple standalone scala file with scala hello.scala. When I do this, I get this error:

Error: Could not find or load main class hello.scala
Caused by: java.lang.ClassNotFoundException: hello.scala

I'm using scala3.

Here's a state of my file and commands I'm running.

CodePudding user response：

If you follow the steps from the documentation you'll see that you need to compile your file before running it.

If you run:

scalac hello.scala
scala hello

You should get the result you want.

CodePudding user response：

you might consider using the new (and excellent) tool from virtuslab called 'scala-cli': https://scala-cli.virtuslab.org/