JSP API QuickReference 220 Other Classes and Interfaces The HttpJspPage interface and the JspFactory Class, are both used exclusively by the JSP engine and do not offer any useful methods to the JSP developer. As such it doesn't make sense to present them here. If you are attempting to build a JSP engine, there are several great resources available including the standard JavaDocs and the reference implementation of the JSP engine. Classes in javax.servlet.jsp.tagext.* The JSP Tag Extensions package, javax.servlet.jsp.tagext, is a subset of the JSP package. The package javax.servlet.jsp.tagext defines the following classes and interfaces: Interface: SuperInterface: SubInterfaces: javax.servlet.jsp.tagext.Tag none javax.servlet.jsp.tagext.BodyTag