How to start earning passive income from Java?

Question

Java

Recently, the following questions have arisen: how can one begin to receive passive income from Java and possible technologies arising from it?
For all the time from other directions, I have come across various platforms and forms of earnings, where you can upload scripts for video processing programs, templates for sites, video courses that are made one-time (most often modified over time), and depending on demand, bring some income.

Answer 1

make your product and sell it

Answer 2

1. Make a mobile application for android.
2. Make a web application - some tool with a paid subscription (and free limited or with ads).
3. Earn money at work, invest in a bank or buy bonds.

Answer 3

How to start earning passive income from Java?

1. Buy JAVA
2. Long-term lease of JAVA
3. PROFIT!

Answer 4

Android App + Google AdMob