INTERVIEW QUESTIONS J2EE DETAILS

Question: What is the function of all 9 implicit objects(application ,session,request,response,out,page,
pageContext,config,exception)?

Answer: the main function of implicit objects are to simply sniplets of java code in jsp we are using pre-defined variables..these variables are implicit variables

the main function of implicit objects are to simply sniplets of java code in jsp we are using pre-defined variables..these variables are implicit variables Source: CoolInterview.com

we can use these implicit objects without declaring in a jsp page.Internally these variables are declared in the _Jspservice method of the servlet that is generated by the jsp compiler. Source: CoolInterview.com

Function of the 9 implicit objects :
1. application interface (javax.servlet.ServletContext) Refers to the web application's enviornment
2. session interface ((javax.servlet.http.HttpSession) Refers to the User's session
3. request interface ((javax.servlet.http.HttpServlet.Request) Refers to the current request page
4. response interface ((javax.servlet.http.HttpServlet.Response) Refers to the current response to the client
5. out Class (javax.servlet.jsp.JspWriter) Refers to the output stream for http page
6. page Class (java.lang.Object) Refers to the page's servlet instance
7. pageContext Class (javax.servlet.jsp.PageContext) Refers to the page's enviornment
8. config Interface (javax.servlet.ServletConfig) Refers to the servlet's configuration
9. exception Class (java.lang.Throwable) Used for error handling
Source: CoolInterview.com

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