Implicit Objects

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Implicit Objects

The Servlet also creates several objects to be used by the JSP
engine. These objects are available for the JSP developer and they can use the objects in the JSP files without declaring the objects in the JSP. The following table will explain all the implicit objects available in the JSP pages.

Object	Description
out	The out object is an instantiation of a javax.servlet.jsp.JspWriter object. This object may represent a direct reference to the output stream, a filtered stream, or a nested JspWriter from another JSP.
request	Each time a client requests a page the JSP engine creates a new object to represent that request. This new object is an instance of javax.servlet.http.HttpServletRequest and is given parameters describing the request.
response	The response object is an instance of javax.servlet.http.HttpServletResponse and is used to send the response to the browser.
application	The application is same as the ServletContext object in Servlet. It has the same methods and interfaces that the ServletContext object have in Servlets.
session	The session object is an instance of HttpSession and used to track information about a particular client. Each client has one global session object.
pageContext	The pageContext object is used to represent the entire JSP page and contains information about the directives issued to the JSP page.
config	The config object is an instantiation of javax.servlet.ServletConfig. It has the same methods and interfaces that the ServletConfig object have in Servlet.
exception	The error handling methods described in . It is available only when the previous JSP page throws an uncaught exception and the <%@ page errorPage="..." %> tag was used. The exception object is a wrapper containing the exception thrown from the previous page.
page	This object is an actual reference to the instance of the page. In other words we can say , page object equal to this object.