app.js

/*
In NativeScript, the app.js file is the entry point to your application.
You can use this file to perform app-level initialization, but the primary
purpose of the file is to pass control to the app’s first module.
*/

require("./bundle-config");
var application = require("application");

com.example.lib.myClass.doSomethingMethodFromJar("jar file loaded!")
application.start({ moduleName: "main-page" });

/*
Do not place any code after the application has been started as it will not
be executed on iOS.
*/