In IntelliJ, you need to have a run configuration whenever you want to run something: a program, a unit test, an external tool. A run configuration sets up the classpath, arguments, and environment variables that you need to run your executable.
We need to create a run configuration the first time we want to run the Scala console:
- Go to
Run|Edit Configurations. Click on the green+button, and selectScala Console. You should see the following screen:
- Make the following changes and click
OK:
- Name:
Scala Console. - Check
Single instance onlybox – we rarely need to have two consoles running at the same time. - In,
Before launch, click onBuildand then click theRemovebutton. This way, you will always be able to quickly run a console, even if your code does not compile. - Following that, click on
OK.
Click on the green arrow to run the console. You should see the following at the bottom of the screen, in the
Runwindow. We can now type our first Scala expression after the Scala prompt:
