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 …
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 …
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!!!” …
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 …
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 …
41.What is Polymorphism? Polymorphism is the ability of an object to take on many forms. The most common use of polymorphism in OOP occurs when a parent class reference is …
31.What is an Exception? An exception is a problem that arises during the execution of a program. Exceptions are caught by handlers positioned along the thread’s method invocation stack.
21.What do you mean by synchronized Non Access Modifier? Java provides these modifiers for providing functionalities other than Access Modifiers, synchronized used to indicate that a method can be accessed …
11.What is a Class Variable? These are variables declared with in a class, outside any method, with the static keyword.
1.What do you know about Java? Java is a high-level programming language originally developed by Sun Microsystems and released in 1995. Java runs on a variety of platforms, such as …
