Kotlin Programming Cookbook

How it works...

To make self-executable JARs, we need a manifest file called MANIFEST.MF in the META-INF directory. For our purposes here, we just need to specify the name of the Java class that contains the Java-based extractor program's main() method.

One might argue that even though we don’t have top-level class declaration, we are specifying it as HelloWorldKt in the code for the jar task:

manifest {       attributes 'Main-Class': 'HelloWorldKt'   }

The reason for putting the preceding code block in the jar task is that Kotlin compiler adds all top-level functions to respective classes for back-compatibility with JVM. So, the class generated by Kotlin compiler will have the filename, plus the Kt suffix, which makes it HelloWorldKt.

Also, the ...