1. jspInit(): This method is the called form the init() method. This method is of interface javax.servlet.jsp.JspPage. We can override this method. This method will be called once when the container loads the servlet for the first time.
2. _jspService(): This method is called from the servlet's service method. The container passes the Request and Response objects to this method. We can't override this method. It is a method of javax.servlet.jsp.HttpJspPage interface.
3. jspDestroy: This method is called by the servlet's destroy() method. We can override this method. It is a method of javax.servlet.jsp.JspPage interface.