When should Throwable be used instead of new Exception?

Question

Given: Throwable is Exception\'s superclass.

When I read texts on writing your own \'exceptions\', I see examples of Throwable

Answer 1

You shouldn't use Exceptions as a "return type" either...

If the condition you're throwing for is common, you are spending a huge amount of resources to return that condition to the calling routine. Exceptions are expensive to construct.

I've seen cases where tight loops that threw exceptions as a "negative" for e.g. ID allocation, this routine occupied about 99% of the CPU time .. when changed to a documented return constant instead, this dropped to 25%.