I like checked exceptions in principle too, but Java's implementation of them is so bad that I hate them there. The first major mistake is that it doesn't suppo

I like checked exceptions in principle too, but Java's implementation of them is so bad that I hate them there. The first major mistake is that it doesn't support exception polymorphism (e.g., I wish you could pass a comparator to Arrays.sort that throws checked exceptions, and have that call to Arrays.sort itself then throw the same checked exceptions), and the second is that the standard library makes a bunch of exceptions checked that should be unchecked (e.g., IOException from close()).