Describe the life cycle methods of a jsp? , JAVA Programming

 

1. Pre-translated: Before the JSP file has been compiled and translated into the Servlet.

2. Translated: The JSP file has been compiled and translated as a Servlet.

3. Initialized: Prior to handling the requests in the service function the container calls the jspInit() to initialize the Servlet. Invoked only once per Servlet instance.

4. Servicing: Services the client requests. Container invokes the _jspService()  function for each request.

5. Out of service: The Servlet resource is out of service. The container invokes the jspDestroy() function.

Could you have your JSP-generated servlet subclass your own servlet instead of the default HttpServlet?

Your JSP started servlet may extend your own servlet with the directive:

<%@ page extends="com.CRMServlet"%>

But, you have to be very careful when having your JSP pages added your own servlet class.  By doing so you can lose any advanced optimization that can be given by your JSP engine.  If you do have a compelling problem to do so then your own superclass servlet has to fill the aspect with the JSP engine by:

1.  Providing the HttpJspPage interface for JspPage interface or HTTP protocol. If you do not then you will have to prepare that all your super-class servlet functions are defined as final.

2.  Implementing your super-class servlet functions as given:

  • The service() method has to call the _jspService() function.
  • The init() method has to call the jspInit() function.
  • The destroy() method has call jspDestroy() function.

If the above conditions are not present, then a translation error may be given by your JSP engine.

 

Posted Date: 7/25/2012 4:01:48 AM | Location : United States







Related Discussions:- Describe the life cycle methods of a jsp? , Assignment Help, Ask Question on Describe the life cycle methods of a jsp? , Get Answer, Expert's Help, Describe the life cycle methods of a jsp? Discussions

Write discussion on Describe the life cycle methods of a jsp?
Your posts are moderated
Related Questions
I just finished a small tutorial on JSP and servlet now I was looking for some assignments so that I can try my hands on

What is use of join in Java Threading

What are the role of Keywords in java? Keywords are identifiers such as public, static and class in which have a special meaning inside Java source code and outside of comments

What is the basic difference among Publish Subscribe model and P2P model? Ans) Publish Subscribe model is typically used in one-to-many situation. It is unreliable but very quic

Does Java pass arguments by value or reference? Ans) Pass by value. 1. When passing primitives, it going a copy of the variable to the method. Any change made in the method d

how to write java programe and example programe

what are the steps of object oriented programming language?

How much CPU time does an applet get? One of the few legitimate concerns about hostile applets is excessive use of CPU time. It is possible on a non-preemptively multitasking s

What is meant by semantic error? Occur while a statement executes and has an effect not intended through the programmer and Frequently times occur only in unusual & infrequent

A device for validating the data a user inputs to a JavaServer Faces UI component.