Aren't you great. As a java developer I am well aware of them too. For most people java == java applets; or "hello world" with `javac Hello.java` and then `java -cp. Hello` followed by some interminable wait while all the apparatus of the JVM is marshalled for the sole purpose of emitting a static string and then exiting. And by interminable I mean 2 or 3 second but still.

Even in more enlightened scenarios a REPL on jruby is just eye-wateringly painful unless you've all the "secret speedups" enabled.

In many more modern development cultures such secrets are generally looked upon as "Yak Shaving".