Java Web Four big scopes nine built-in objects

When each JSP page is accessed for the first time, the Web container will give the request to the JSP engine (a Java program) to process. The JSP engine first translates the JSP into a _jspservlet (essentially a servlet) and then invokes it in the way the servlet calls.
JSP nine large implicit objects:
Request HttpServletRequest
Response HttpServletResponse
Session HttpSession
Application Servletccontext
Config ServletConfig
Exception (used in special cases)
Page this (this JSP page)
Out JspWriter (with buffered PrintWriter)
PageContext (Make common Java classes accessible to Web resources, custom tags commonly used)
4 Domain objects:
PageContext (called page field)
Request (called request domain)
Session (called Session field)
ServletContext (called application domain)

Java Web Four big scopes nine built-in objects