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Servlet interview questions

  • Exception handling in Servlet and JSP specifications view answer
  • Details about load on startup (load-on-startup tag) in Servlet ? view answer
  • What's the difference between init() & init(ServletConfig) and Which is better ? view answer
  • Servlet Life Cycle ? view answer
  • Q. Can we override init() or init(ServletConfig) method of HttpServlet ? Which is better ? view answer
  • Q. Can we override service method in HttpServlet ? view answer
  • Q.What is the difference between init() and init(ServletConfig) ? view answer
  • Q.How to upload an File/image from servlet/jsp into server from clients machine? view answer
  • What's the difference between init() & init(ServletConfig) in genericServlet ? view answer
  • Q.What is the difference between ServletContext and PageContext? view answer
  • Q.What is the difference in using request.getRequestDispatcher() and context.getRequestDispatcher()? view answer
  • Q.Difference forward() and response.sendRedirect() . view answer
  • Q.Can we use the constructor, instead of init(), to initialize servlet? view answer
  • Q.Explain the life cycle of Servlet? view answer
  • Q.Why don't we write a constructor in a servlet? view answer
  • Q.When we don't write any constructor for the servlet, how does container create an instance of servlet? view answer
  • Q.Why is it that we can't give relative URL's when using ServletContext.getRequestDispatcher() when we can use the same while calling ServletRequest.getRequestDispatcher()? view answer
  • Q.Once the destroy() method is called by the container, will the servlet be immediately destroyed? What happens to the tasks(threads) that the servlet might be executing at that time? view answer
  • Q.Request parameter How to find whether a parameter exists in the request object? view answer
  • What is new in ServletRequest interface ? view answer
  • Q.Given the request path below, which are context path, servlet path and path info? /bookstore/education/index.html view answer
  • Q.When a client request is sent to the servlet container, how does the container choose which servlet to invoke? view answer
  • Q.What is servlet container? view answer
  • Why IllegalStateException in jsp/servet? view answer
  • Q.How do I upload a file in a servlet app? view answer
  • Q.What's the difference between response.sendRedirect() and requestDispatcher.forward() ? view answer
  • Q.How do I implement security for my web application ? view answer
  • Q.How can I use servlets with protocols other than HTTP, e.g. FTP? view answer
  • Q.What happens if i call destroy() from init()? view answer
  • Q.Why can't a container call constructor having parameters? view answer
  • Q.Why do servlets have an init method? Can't we make use of the servlet constructor for initialization? view answer
  • Q.Explain the life cycle methods of a Servlet. view answer
  • Q.Explain the directory structure of a web application view answer
  • Q.What are the common mechanisms used for session tracking? view answer
  • What is load-on-startup in servlet ? view answer
  • Q. What is the difference between the getRequestDispatcher(String) and getNamedDispatcher(String) methods in the ServletContext Class? view answer
  • Q: What is the difference between Difference between doGet() and doPost()? view answer
  • Q. What is the difference between ServletContext and ServletConfig? view answer
  • Q: What is the difference between HttpServlet and GenericServlet? view answer
  • Q.What is the difference between the getRequestDispatcher(String path) method of ServletRequest interface and ServletContext interface? view answer

!!! Servlet interview questions !!!

Q: What is the difference between HttpServlet and GenericServlet?



Difference are
1) HttpServlet extends GenericServlet
<b>HttpServlet </b>Provides an abstract class to be subclassed to create an HTTP servlet suitable for a Web site. A subclass of HttpServlet must override at least one method, usually one of these:

doGet, if the servlet supports HTTP GET requests
doPost, for HTTP POST requests
doPut, for HTTP PUT requests
doDelete, for HTTP DELETE requests
init and destroy, to manage resources that are held for the life of the servlet
getServletInfo, which the servlet uses to provide information about itself
There?s almost no reason to override the service method. service handles standard HTTP requests by dispatching them to the handler methods for each HTTP request type (the doXXX methods listed above). Likewise, there?s almost no reason to override the doOptions and doTrace methods.

<b>GenericServlet </b>defines a generic, protocol-independent servlet. To write an HTTP servlet for use on the Web, extend HttpServlet instead.

GenericServlet implements the Servlet and ServletConfig interfaces. GenericServlet may be directly extended by a servlet, although it?s more common to extend a protocol-specific subclass such as HttpServlet.

GenericServlet makes writing servlets easier. It provides simple versions of the lifecycle methods init and destroy and of the methods in the ServletConfig interface. GenericServlet also implements the log method, declared in the ServletContext interface.

To write a generic servlet, you need only override the abstract service method.


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