CODEWITHSUNDEEP
intellij-ideakotlinconsole-application
KansaiRobot
KansaiRobot

Reputation: 10012

Running a simple hello world from the console after installing IntelliJ IDEA

I have installed IntelliJ IDEA on my mac and wrote the simplest Kotlin program

fun main(args : Array<String>){

    println("Hello")
}

I can run it from the IDE environment. (It prints Hello of course)

My question: How can you run this from the console?

What I have done:

I tried to call 

java simplekt.class

but I got Error: could not find or load main class simplekt.class

I tried java simplekt but then I got an exception in thread main java.lang.NoClassDefFoundError

I tried to use kotlin or kotlinc but the command was not found. (where is the compiler installed?)

In this resource they use kotlinc and they produce a jar file but IDEA only output a class file.

Not really sure how to proceed from here.

Upvotes: 3

Views: 812

Answers (2)

user8395964
user8395964

Reputation: 144

The above answer by @user2340612 is mostly right, but maybe due to software changing or some differences in what i did, it did not work for me. Following did:

  • to avoid repetition, i'll be using the short name: $(ideac) = "IntelliJ IDEA Community Edition 2022.2" in place of the full name
  • the path to the kotlinc is this one: $(ideac)\plugins\Kotlin\kotlinc\bin
    much similar to the one told above, but slightly different
  • i have verified it to work in the command given in the command-line doc linked above or compiler-reference too: kotlinc hello.kt -include-runtime -d hello.jar
  • running the resultant .jar file via java -jar ./hello.jar shows the expected output
  • there's no kotlin-native in that folder, so, couldn't verify this native-command-line-compiler kotlin doc

Backstory/What did not work

  • the command under the run tab in $(ideac) no longer shows the kotlinc path
  • I had created the Kotlin "project" by using "new project" (intelliJ) or by "Kotlin multiplatform > JVM" (gradle)
  • The run command for either of these did not contain any kotlinc in them
  • I tried creating a new > "scratch" file; and it showed this: $(ideac)\plugins\Kotlin\bin\windows\LLDBFrontend.exe but i tried using that on CLI and it did not work either

Upvotes: 1

user2340612
user2340612

Reputation: 10733

When you run your application from the IDE, in the Run window the very first line is the command that the IDE executes to start your program. In my case it's something like:

/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/bin/java -Dfile.encoding=UTF-8 <a lot more omitted>

You can execute the same command in your terminal and that will execute the application. Reading that line will also (indirectly) tell you where the kotlinc command is installed, and in my case – using MacOS – it's at /Applications/IntelliJ\ IDEA.app/Contents/plugins/Kotlin/kotlinc/bin/kotlinc

However, you can always decide to entirely stop using the IDE and compile/run your program from the command line by following instructions here: https://kotlinlang.org/docs/tutorials/command-line.html

Upvotes: 1

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