JSP Interview Questions

We cant implement interface in JSP but we can use extends used to extends class not interface

No, We Can't Implement interface in JSP

Server site application contains web resources such as active web resources and passive web resources. Those resides in server passive web resource execution done at browser and active web resources ...

The web container is a Java runtime environment which is responsible for managing life cycle of JSP pages and Servlets. A web container is responsible for instantiating, initializing and invoking Serv...

A database link can use at database level to transfer data and we can use web service at application level to transfer data between two applications

init() and destroy() methods can be overrided by an JSP page author

init() and destroy() methods can be override. not service() method.

Its better you use Jquery or java script or ajax so that we dont need to completely submit the jsp page just dialog box appear for upload picture and after uploading it will close

Multipart/form-data

The information of buffer size, content length, content type and locale is provided to the client by the servletresponse interface.

Every servlet follows the same cycle

*The servlet is initialized by calling the init () method.
*The servlet calls service() method to process a clients request.
*The servlet is terminated by calling the destroy() method.
*Finally, servlet is garbage collected by the garbage collector of the JVM.

No, we cant write these codes within scriptlets.

By using Callable Statement like CallableStatement csmt=con.PrepareCall("{PackageName.ProcedureName}"); In jsp U can write these code with in Scriptlet

Code
<% CallableStatement csmt=con.PrepareCall("{PackageName.ProcedureName}"); %>

Jsp container provides a easy way to access standard objects and actions..

Easily saying

1)Auto compilation(translation.....)

2)Not deployment descritpor specific

3)Multiple deployment is avoided.

absolute url is full url relative url is part of url wn we are in app

As there seems to still be confusion about the difference between relative and absolute urls, I thought I'd post a little information and a reference link for everyone. An url that is ABSOLUTE shows ...

isELIgnored="true"

We can use isEliIgnored property or we can disable by using below code..

isErrorPage and errorPage

Example:


The exception will be thrown inside the catch:

<% int x = 5/0;%>



The exception is : ${catchException}


There is an exception: ${catchException.message}

we can do same as doing in java wd scriptlet

We can call stored producedure using sql tags in jstl "java5 For example, calling a stored procedure that returns a result set: exec ExampleProcLoadExample ? ...

we can set attribute in application session or request attribute.here page wont be use ful bcz scope of page is same page only

1.page
2.session
3.request.
4.application

using these scoped variables we can translate data from one resource to another

ex: request.setAttribute("key","value");
Object o=getAttribute("key");

The RequestDispatcher objects forward method to pass the control. The response.sendRedirect method

Code
<%      response.sendRedirect("RedirectIfSuccessful.html");            %>
 
<%
String st=request.getParameter("n");
if(st==""){
getServletContext().getRequestDispatcher("/form.jsp").forward(request, response);
}
else{
getServletContext().getRequestDispatcher("/welcome.jsp").forward(request, response);
}
%>
 

There are 2 ways to redirect the page
1) Use the forward :- By using this
you will get the all the objects in the redirected page.
2) response.sendRedirect("Path") :- In This case the control is not transferred to the next page.

application javax.servlet.ServletContext config javax.servlet.ServletConfig exception java.lang.Throwable out javax.servlet.jsp.JspWriter page java.lang.Object PageContext javax.servlet.jsp.PageContex...

What exactly mean by the following:

jsp-api.jar is missing in the build path.

What happen if it is occurred in Struts 2.1.0 ? while i trying to submit a list value from JSP page in action class : -



why jasper exception occurred when action successfully got the list value - and It give " Unhandled exception in struts : JasperException.

Can someone tell me...how a servlet container execute init(),service() and destroy() method in a sequential manner ?
is it true that a servlet container itself contains a main() method which call these methods ?

thanks in advance...

We can use main method in Jsp/servlet, but there is no use. This main() method will not execute throughout the life cycle. Then why should we need to use.Generally these JSP/Servlets are server side t...

NO, There will be one single instance of the servlet in the web-container ,when request arrives to the server a thread will be created rather creating the object. so that multiple request will have ...

single servlet object will be loaded in memory and one thread per request would be created by the container to serve those requests.

Thanks,
Vinay