A modern programming language that makes developers happier.

kotlinlang

I have a class
```
class MyClass {
  companion object {
    public fun run(args: Array&lt;String&gt;) {
      ...
    }
  }
  public fun main(args: Array&lt;String&gt;) {
    ...
  }
}
```
How to call `run` from `main`?

Perhaps, that was a bad idea. Can't run it from jar

That `main` fun cannot be used as a JVM main method, those need to be static.

`main` should be a top level function and class name would be `&lt;filename&gt; + Kt` then.
Or you can put `main` into a companion object of a class, but then you also need annotate this function with `@JvmStatic`.

Many thanks, I've almost broke my brain because of non-runnable jar

Maybe something wrong with gradle? Even with this trick it does not run

`Error: Could not find or load main class testline.ExampleKt`

Project tree
```
src/
├── main
│   ├── kotlin
│   │   └── testline
│   │       └── Example.kt
│   └── resources
└── test
    ├── kotlin
    │   └── testline
    │       └── ExampleTest.kt
    └── resources
```

build.gradle.kts:
```
application {
  // Define the main class for the application.
  mainClassName = "testline.ExampleKt"
}

tasks {
  withType&lt;Jar&gt; {
    manifest {
      attributes(mapOf("Main-Class" to application.mainClassName))
    }
  }
}
```

```
package testline

// imports
import java.io.IOException
...
class Example {
  companion object {
    @JvmStatic
    public fun main(args: Array&lt;String&gt;) {
...
    }
  }
}

//fun main(args: Array&lt;String&gt;) {
//  Example.main(args)
//}

// vim: se et ts=2 sw=2 number:
```

When using `companion object` + `@JvmStatic` your `main` method will be in class `Example`, not `ExampleKt`

```
Exception in thread "main" java.lang.NoClassDefFoundError: org/jline/reader/UserInterruptException
	at testline.Example.&lt;clinit&gt;(Example.kt)
Caused by: java.lang.ClassNotFoundException: org.jline.reader.UserInterruptException
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 1 more
```