Servlet 2.5 API

Packages
javax.servlet The javax.servlet package contains a number of classes and interfaces that describe and define the contracts between a servlet class and the runtime environment provided for an instance of such a class by a conforming servlet container.
javax.servlet.http The javax.servlet.http package contains a number of classes and interfaces that describe and define the contracts between a servlet class running under the HTTP protocol and the runtime environment provided for an instance of such a class by a conforming servlet container.
javax.servlet.jsp Classes and interfaces for the Core JSP 2.0 API.
javax.servlet.jsp.el Classes and interfaces for the JSP 2.0 Expression Language API.
javax.servlet.jsp.tagext Classes and interfaces for the definition of JavaServer Pages Tag Libraries.