How to use with `java` command with `kotlin-compiler.jar` to compile Kotlin source codes?

Question

I am now limited to use java command to compile a Kotlin source file.

So after some attempts, I found a kotlin-compiler.jar file in the lib/ folder in kotlinc/.

Then I tried to write a Hello.kt file in kotlinc/lib/:

public fun main(args: Array<String>) {
    println("hello")
}

And then, I executed the command java -jar kotlin-compiler.jar Hello.kt which worked and generated a class file HelloKt.class.

As a result I executed the command java -cp ".:kotlin-runtime.jar" HelloKt, and it also worked:

[xxxxxxx@uss lib]$ java -cp ".:kotlin-runtime.jar" HelloKt
hello

But, for a more complicated source file:

AimToTen.kt:

class AimToTen() {
    fun need(marks: Array<Int>): Int {
        // multiply 10 first
        for (idx: Int in marks.indices) marks[idx] *= 10

        val result: Int = 190 * marks.size - 2 * marks.sum();
        return when {
            result < 0 -> 0
            result % 10 != 0 -> result / 10 + 1
            else -> result / 10;
        }
    }
}

I tried to execute java -jar kotlin-compiler.jar AimToTen.kt, but some functions missed(?):

[xxxxxxx@uss intro1]$ java -jar kotlin-compiler.jar AimToTen.kt
AimToTen.kt:4:32: error: unresolved reference: indices
        for (idx: Int in marks.indices) marks[idx] *= 10
                               ^
AimToTen.kt:10:56: error: unresolved reference: sum
        val result: Int = 190 * marks.size - 2 * marks.sum();
                                                       ^

So I tried again:

[xxxxxxx@uss intro1]$ java -jar kotlin-compiler.jar
Welcome to Kotlin version 1.0.3 (JRE 1.8.0_65-b17)
Type :help for help, :quit for quit
>>> println(123)
error: unresolved reference: println
println(123)
^

>>> var test: IntArray = intArrayOf(1, 2)
>>> test
[I@7d64e326
>>>

Also, in other folder, the Hello.kt cannot be compiled even if I copied all the .jar files in the same folder.

Ehh, I do appreciate if you can help me with this issue! I want to compile this file with java command, without any absolute paths.

P.S. Using kotlinc AimToTen.kt works.

you are missing kotlin-stdlib somewhere. Try adding it to the compiler options — voddan
– voddan, Commented Aug 28, 2016 at 22:28
@voddan That's what I thought, but how to add it? The stdlib you mentioned seems to be kotlin-runtime.jar, which I've already tried: java -cp kotlin-runtime.jar -jar kotlin-compiler.jar AimToTen.kt and java -cp ".:kotlin-runtime.jar" -jar kotlin-compiler.jar AimToTen.kt resulted in failure. Thanks for answering! — MewX
– MewX, Commented Aug 28, 2016 at 23:43

voddan · Accepted Answer · 2016-08-28 22:33:23Z

1

As stated in the docs, the line to compile a Kotlin file is

$ kotlinc hello.kt -include-runtime -d hello.jar

BTW, if you are trying to learn/try out Kotlin in command line (which you should not!), you may consider http://try.kotlinlang.org/

answered Aug 28, 2016 at 22:33

voddan

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3 Comments

MewX Over a year ago

Thanks, but scala and clojure are all able to be compiled by java command. So I think Kotlin should be as well. Additionally, the kotlinc is a bash file and what command it's using is actually java xxxxxxxxx.

user207421 Over a year ago

@MewX Use the script. That's what it's for.

MewX Over a year ago

@EJP Thanks, but why the script needs the installed path? I was wondering what files are required in the compiling procedure.

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