What are the life-cycle methods of JSP?

Posted By: Avi

Date: 17 September 2009 06:38:31 AM

Answer:

JSP page is processed into a servlet class which implements the HttpJspPage interface of the javax.servlet.jsp package. The HttpJspPage interface extends the JspPage interface which inturn extends the Servlet interface of the javax.servlet package. The generated servlet class thus implements all the methods of these three interfaces. The JspPage interface declares two mehtods, jspInit() and jspDestroy(), while HttpJspPage interface declares one method _jspService(). So these three methods must be implemented by all the JSP pages and these are also the life-cycle methods of JSP page.

1)jspInit():
The container calls the jspInit() to initialize the servlet instance. It is called before any other method, and is called only once for a servlet instance. The jspInit() method can be overridden within a JSP page.

2)_jspService():
The container calls the _jspservice() for each request and it passes the request and the response objects. The _jspService() method cannot be overridden.

3) jspDestroy():
The container calls this when its instance is about to destroyed. The jspDestroy() method can be overridden within a JSP page.

Posted By: eTechPlanet

Date: 17 September 2009 06:38:31 AM

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