node_worker_hello.js

let w = new Worker(`
        const JavaClass = Java.type('my.very.important.JavaClass');
        const { parentPort } = require('worker_threads');
        parentPort.postMessage(JavaClass.someVeryLongCall());
    `, {eval:true});

w.on('message', (m) => {
  console.log('Got data from Java, via worker thread:' + m);
});