Kotlin: Errors on virtual studio code when kotlin coding

Question

I am trying to use vscode to coding with kotlin. After installing kotlin language and code runner extensions on vscode and install kotlin by snap on my mxlinux:

alt@mx:~
$ snap list
Name    Version    Rev    Tracking       Publisher   Notes
core    16-2.51.4  11606  latest/stable  canonical✓  core
kotlin  1.5.30     61     latest/stable  jetbrains✓  classic
alt@mx:~

alt@mx:~
$ snap version
snap    2.51.4
snapd   2.51.4
series  16
debian  10
kernel  4.19.0-17-amd64
alt@mx:~

I wrote this code on vscode:

fun main(args: Array<String>) {
    var string = "Hello Students!"
    val age: Int = 23
    println(string)
    println(age)
}

and run I got result and error:

[Running] cd "/mnt/Project/Android/Practise/Kotlin/Practices/tuto1/" && kotlinc HelloWorld.kt -include-runtime -d HelloWorld.jar && java -jar HelloWorld.jar
HelloWorld.kt:1:10: warning: parameter 'args' is never used
fun main(args: Array<String>) {
         ^
Hello Students!
23

[Done] exited with code=0 in 12.147 seconds

And In Ide there are a lots of error:

"parameter 'args' is never used" is not an error. It clearly says that it is a warning. — Sweeper
– Sweeper, Commented Sep 9, 2021 at 9:01
Also, which extension did you install? Can you post the links? I used this one and it works. The error that you got in VS code suggests that you need to specify the -include-runtime option in somewhere. — Sweeper
– Sweeper, Commented Sep 9, 2021 at 9:15
I installed marketplace.visualstudio.com/items?itemName=fwcd.kotlin and marketplace.visualstudio.com/… extension — Cyrus the Great
– Cyrus the Great, Commented Sep 9, 2021 at 9:24

Sweeper · Accepted Answer · 2021-09-09 09:46:50Z

2

and run I got result and error

That is not an error. As it clearly says, it is a warning. Warnings don't stop your code from compiling and running. If you don't want the warning, you can pass the -nowarn compiler option to kotlinc. If you do want the warning to stop your code from compiling, pass -Werror instead. See list of compiler options here.

And In Ide there are a lots of error

From the description of the Kotlin VSCode extension, you are supposed to open a Gradle/Maven project (see my answer here for how to create one), and "support for Kotlin source files with a standalone compiler is experimental". I've also found this issue that points out that even if you don't use Gradle or Maven, you still have to open a folder.

So rather than opening the file like this:

$ code MyProject/HelloWorld.kt

You should open it like this:

$ code MyProject

In other words, open the folder that contains the kotlin file.

answered Sep 9, 2021 at 9:46

Sweeper

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1 Comment

Cyrus the Great Over a year ago

Yep, I need gradle

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