Breaking through layers of abstraction and learning more about what actually happens with the code you write is a generally useful thing, in my opinion. As a lo

Breaking through layers of abstraction and learning more about what actually happens with the code you write is a generally useful thing, in my opinion. As a long-time Java developer, I've spent a fair amount of time learning about JVM internals, despite having never committed a line of code to OpenJDK or any other JVM project, and there have been times where having that extra knowledge has been incredibly useful. Plus, these things tend to be fairly interesting, and learning about them is just plain fun.