Question: Explain the life-cycle methods in JSP?

By: Guru Singh Viewed: 169 times  Printer Friendly Format    

Question: Explain the life-cycle methods in JSP?

Answer:  The generated servlet class for a JSP page 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 only two mehtods - jspInit() and jspDestroy() that must be implemented by all JSP pages regardless of the client-server protocol. However the JSP specification has provided the HttpJspPage interfaec specifically for the JSp pages serving HTTP requests. This interface declares one method _jspService().

The jspInit()- The container calls the jspInit() to initialize te servlet instance.It is called before any other method, and is called only once for a servlet instance.

The _jspservice()- The container calls the _jspservice() for each request, passing it the request and the response objects.

The jspDestroy()- The container calls this when it decides take the instance out of service. It is the last method called n the servlet instance.





Most Viewed Articles (in Interview )

What is the difference between JTS and JTA?

Interview Question: What is Action Class?

Interview Question: What is the difference between EAR, JAR and WAR file?

Tell me something about J2EE component?

What is Deployment Descriptor?

Explain garbage collection?

What is the difference between jsp:include page and @ include file?

Interview Question: What is ActionForm?

Interview Question: What about JSTL and JavaServer Faces ?

Interview Question: Why are some of the class and element names counter-intuitive?

Interview Question: What is the difference between ejbCreate() and ejbPostCreate?

Interview Question: What is the difference between Message Driven Beans and Stateless Session beans?

What are the services provided by a container?

What is Collection API?

What is similarities/difference between an Abstract class and Interface?

Latest Articles (in Interview)

Comment on this tutorial