latest jsp interview question

jsp - API package : javax.servlet.jsp

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a. interface

1. HttpJspPage

It's extend JspPage. It have one method _jspService(req,res)

2. JspPage

It's extend javax.servlet.Servlet

It have two method jspDestroy(),jspInit()

b. Classes

1. ErrorData

2. Jsp Context

3. JpsEngineInfo

4. JspFactory

5. JspWrite

6. PageContext

c. Exception

JspException

JspTagException

SkipPageExceptiom

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JSP Life Cycle

If an instance of the JSP page's servlet does not exist, the container:

1. Loads the JSP page's servlet class
2. Instantiates an instance of the servlet class
3. Initializes the servlet instance by calling the jspInit method
2. Invokes the _jspService method, passing a request and response object. Don't Overridden.

3. If the container needs to remove the JSP page's servlet, it calls thejspDestroy method.

Question: What are implicit Objects available to the JSP Page?

Answer: Implicit objects are the objects available to the JSP page. These objects are created by Web container and contain information related to a particular request, page, or
application.
The JSP implicit objects are:

Variable	Class	Description
application	javax.servlet.ServletContext	The context for the JSP page's servlet and any Web components contained in the same application.
config	javax.servlet.ServletConfig	Initialization information for the JSP page's servlet.
exception	java.lang.Throwable	Accessible only from an error page.
out	javax.servlet.jsp.JspWriter	The output stream.
page	java.lang.Object	The instance of the JSP page's servlet processing the current request. Not typically used by JSP page authors.
pageContext	javax.servlet.jsp.PageContext	The context for the JSP page. Provides a single API to manage the various scoped attributes.
request	Subtype of javax.servlet.ServletRequest	The request triggering the execution of the JSP page.
response	Subtype of javax.servlet.ServletResponse	The response to be returned to the client. Not typically used by JSP page authors.
session	javax.servlet.http.HttpSession	The session object for the client.