Rethrowing an Exception: Why does the method compile without a throws clause?

Question

On the source code below I\'m rethrowing an Exception.
Why is it not necessary to put the throws keyword on the method\'s signature?

Answer 1

throw new Exception(); is something you should never do in a catch block, but you may have to or want to do throw new SomeException(throwable); (preserving the full stack trace) instead of throw throwable; in order to conform to the API of your method, e.g. when it declares to throw SomeException but you're calling code that might throw an IOException that you don't want to add to you method's throws clause.

The probably most common case is new RuntimeException(throwable); to avoid having a throws clause altogether.