What Is rt.jar? (classes.jar and jfxrt.jar Explained)

What rt.jar, classes.jar, and jfxrt.jar are, where they live, why rt.jar vanished in Java 9, and how to open and decompile them.

What rt.jar Contains and Where It Lives

Why rt.jar Is Gone in Java 9+

classes.jar

jfxrt.jar

How to Open or Decompile These JARs

Summary