When a Container translates the JSP into a servlet,the beginning of the service method is a pile of implicit object declarations and assignments.
All of the implicit objects map to something from the Servlet/JSP API.The request implicit object ,for example ,is a reference to the HttpServletRequest object passed to the service method by the Container.
API Implicit Object
JspWriter ------------ out
HttpServletRequest ------------ request
HttpServletResponse ------------ response
HttpSession ------------ session
ServletContext ------------ application
ServletConfig ------------ config
Throwable ------------ exception //it only available to designated "error pages"
PageContext ------------ pageContext // a PageContext encapsulates other implicit objects ,so if you give some helper object a PageContext reference,the helper can use that reference to get references to the other implicit objects and attributes from all scopes.
Object ------------ page
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