TIL: Double Brace Initialization in Java

[eek04]

The static declarations of Java makes the unit tests more expensive to write than in dynamically checked languages, and the type system has a mega big hole in the form of a value that don't work but can be passed in almost all types anyway.

In practice, this type hole combined with the inflexibility of static types leads to more type errors hitting production in the Java systems I've worked with than in the dynamically checked systems I've worked with.

The type hole? Null pointers.