JSP/Servlet.

Implicit objects in JSP request - the HttpServletRequest associated with request. response - the HttpServletResponse associated with response to client. out - the JspWriter (PrintWriter subclass) used to send output to the client. session - the HttpSession object associated with request. application -the ServletContext as obtained by getServletConfig().getContext(). Shared by all servlets and JSP pages on server or in Web application. config - the ServletConfig object for this page. pageContext-the PageContext object associated with current page. page - synonym for this (current servlet instance); not very useful now. Placeholder for future. Context Application, Session , request, page.