JEP 295: Ahead-of-Time Compilation offers deployers a chance to compile the base Java modules to native code. This can save time on some optimizations, but it’s understandably limited (and should be).
The Halstead Metrics (also known as “Halsted metrics”) discusses code complexity in Java. Worth considering; this particular explanation comes courtesy of JHawk, a commercial code metrics tool, not to be confused with “j-hawk“, an open source testing tool.
Experimenting with “mutation testing†and Kotlin is a neat post describing PIT, a testing tool that changes your source code and runs your tests – if your tests don’t fail, your tests are probably bad (or your code’s awful.)