Why genericservlet is an abstract class

If any method is abstract, then the class must be abstract. What about HttpServlet class? This class doesn't have any abstract method, still is an abstract class. Arun Giridharan. Dieter Quickfend. HttpServlet is abstract because they don't want you instantiating it without subclassing it.

Pretty much because there is no use at all. Java does a lot to protect developers from their own stupidity checked exceptions, strong typing, Seetharaman Venkatasamy. It is called only after init method is completed successfully. Once the servlet container calls this method, it will not call service again on the same servlet.

This method is best suitable to perform clean-up operations on a servlet. These three methods are called life-cycle methods. Along with these three methods, it contains two more methods. Servlet interface and provides implementations for all of its methods except service method. If you are writing a generic servlet, then your servlet must extend this class and provide implementation for service method.

It also implements javax. ServletConfig and java. Serializable interfaces and give implementations for their methods. It is a servlet that inherits from GenericServlet.

It is customized to the HTTP protocol. Turn servletreuqest and servletResponse to HttpServletRequest in the service Adapter mode In the last article, you will introduce a servlet class to write a servlet class, but if we implement the servlet interface, you must rewrite the five methods, but we need init , servic Get and set up cookies 3.

Get path information 4. HttpServlet 1 is a servlet that inherits from the genericServlet. So the design should ensure that the parent cla An abstract class means to define a method in a class, but not to implement it, but to implement concretely in its subclasses.