Kotlin : While running Hello Program getting ClassNotFoundException

Question

package com.example.manish.myapplication

import android.support.v7.app.AppCompatActivity
import android.os.Bundle

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }
}

fun main(arg : Array<String>){
    print("HI")
}

LogCat:

Exception in thread "main" java.lang.ClassNotFoundException: com.example.manish.myapplication.MainActivityKt
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:264)
    at com.intellij.rt.execution.application.AppMainV2.main(AppMainV2.java:107)

This might be a duplicate of stackoverflow.com/questions/44823064/… — Sufian
– Sufian, Commented Sep 25, 2017 at 0:41

hotkey · Accepted Answer · 2017-09-24 23:14:33Z

2

This is likely a known issue in Android Studio and Kotlin inter-operation.

When you try to run a Kotlin class from a non-Android (e.g. pure Java + Kotlin) module, it does not add the separate directory, into which the Kotlin classes are compiled, to the classpath.

The workaround is to add these lines to your module's build.gradle:

dependencies {
    runtimeClasspath files(compileKotlin.destinationDir)
}

This will work for the main source set. To do the same for tests, use testRuntimeClasspath and compileTestKotlin respectively.

answered Sep 24, 2017 at 23:14

hotkey

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2 Comments

Manish Singla Over a year ago

After doing this I am getting Error:(36, 0) Could not get unknown property 'compileKotlin' for object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.

Abhishek Saxena Over a year ago

I am getting error:

Could not get unknown property 'destinationDir' for task ':compileKotlin' of type org.jetbrains.kotlin.gradle.tasks.KotlinCompile.

Manish Singla · Accepted Answer · 2017-09-26 18:25:33Z

0

Is this an Android applicaton or a regular application? We can’t have a main function in an Android application; it has to be a regular desktop project.

But I dont why it is :)

answered Sep 26, 2017 at 18:25

Manish Singla

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