jsp : Life Cycle and Implicit Objects

Life cycle/Architechure of a JSP

The JSP pages follows these phases:

       Translation of JSP Page

       Compilation of JSP Page

       Classloading (class file is loaded by the classloader)

       Instantiation (Object of the Generated Servlet is created).

       Initialization ( jspInit() method is invoked by the container).

       Reqeust processing ( _jspService() method is invoked by the container).

       Destroy ( jspDestroy() method is invoked by the container).

      Note: jspInit(), _jspService() and jspDestroy() are the life cycle methods of      

      JSP.

JSP Implicit Objects

There are 9 jsp implicit objects. These objects are created by the web container that are available to all the jsp pages.

S.No	Object	Type
1	out	javax.servlet.jsp.JspWriter
2	request	javax.servlet.http.HttpServletRequest
3	response	javax.servlet.http.HttpServletResponse
4	config	javax.servlet.ServletConfig
5	application	javax.servlet.ServletContext
6	session	javax.servlet.http.HttpSession
7	exception	java.lang.Throwable
8	pageContext	PageContext
9	page	java.lang.Object