How to create and reuse a package in Kotlin?

Question

I have two kotlin files : mylib.kt and main.kt

mylib.kt is:

package mylib

fun hello() {
    println ("Hello")
}

and main.kt is:

import mylib.hello

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

I compile mylib with : kotlinc mylib.kt -d mylib.jar And main.kt with : kotlinc main.kt -classpath mylib.jar -include-runtime -d main.jar

I run java with: java -jar main.jar and got :

Exception in thread "main" java.lang.NoClassDefFoundError: mylib/MylibKt
    at MainKt.main(main.kt:4)
Caused by: java.lang.ClassNotFoundException: mylib.MylibKt
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    ... 1 more

What I did wrong ? Thank you for helping.

Answer 1

kotlinc does not generate a jar that is executed via java -jar command. Instead, use java -classpath mylib.jar:main.jar MainKt .