What is the difference between throws Throwable and throws Exception

Question

Any difference about those two?

Answer 1

Exceptions are for errors in the program logic. Error are used by the JVM to signal that something is wrong with the environment such as an OutOfMemoryError or IncompatibleClassChangeError. ThreadDeath is used to kill Threads. Throwable is a super class over all of these.

In normal program logic, you should never throw nor catch Throwables or Errors. The main reason I can think of for catching a Errors is this: You are using your own class loading system and want to isolate broken plugins.

The JavaDoc for ThreadDeath for example says:

An application should catch instances of this class only if it must clean up after being terminated asynchronously. If ThreadDeath is caught by a method, it is important that it be rethrown so that the thread actually dies.