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Editorial Team
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Asked: 2026-05-30T08:22:29+00:00

Jetbrains provides some documentation but I can’t find how to run compiled class file

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Jetbrains provides some documentation but I can’t find how to run compiled class file of Kotlin.

hello.kt:

fun main(args : Array<String>) {
  println("Hello, world!")
}

compile:

$ kotlinc -out dist -src hello.kt
$ ls dist
namespace.class
$ java dist/namespace
Exception in thread "main" java.lang.NoClassDefFoundError: dist/namespace (wrong name: namespace)
$ java -jar /usr/local/kotlin/lib/kotlin-runtime.jar
Failed to load Main-Class manifest attribute from
/usr/local/kotlin/lib/kotlin-runtime.jar

How to run Kotlin program?

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1 Answer

  1. Editorial Team

    We ran into the same program and blogged our solution here: http://blog.ocheyedan.net/blog/2012/02/19/running-kotlin-code/

    Basically you just need to invoke java with the -cp and the main class of ‘namespace’. From your question, the java invocation would look something like this:

    java -cp /usr/local/kotlin/lib/kotlin-runtime.jar:dist/namespace.class namespace
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