Why catch Exceptions in Java, when you can catch Throwables?

From the Java API documentation:

The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

An Error is a subclass of Throwable that indicates serious problems that a reasonable application should not try to catch.

Errors usually are low-level (eg., raised by the virtual machine) and should not be caught by the application since reasonable continuation might not be possible.