Servlets

41.How to create a session in servlet? You would get HttpSession object by calling the public method getSession() of HttpServletRequest, as below: // Create a session object if it is already not created. HttpSession session = request.getSession(); (165)

31.Can multiple filters be configured? Yes. 32.Can filtering be done in an ordered way? If so then how to achieve it? Yes. The order of filter-mapping elements in web.xml determines the order in which the web container applies the filter…

21.How to send an authentication error from a servlet? We can use setStatus(statuscode) method of HttpServletResponse to send an authentication error. // Set error code and reason. response.sendError(407, “Need authentication!!!” ); (160)

11.For what purpose destroy() method of a servlet is used? This method gives your servlet a chance to close database connections, halt background threads, write cookie lists or hit counts to disk, and perform other such cleanup activities. (156)

1.What are Servlets? Java Servlets are programs that run on a Web or Application server and act as a middle layer between a request coming from a Web browser or other HTTP client and databases or applications on the HTTP…