SCJP 1.4, SCWCD 1.4
"Any fool can write code that a computer can understand. Good programmers write code that humans can understand."
- Martin Fowler et al, Refactoring: Improving the Design of Existing Code, 1999
This is from the jsp specification - Do read the warning carefully.
The value is a fully qualified Java programming language class name, that names the superclass of the class to which this JSP page is transformed (see Chapter JSP.11). [BOLD] This attribute should not be used without careful consideration as it restricts the ability of the JSP container to provide specialized superclasses that may improve on the quality of rendered service. [/BOLD]