Why HttpServlet class is declared as abstract even there is no abstract method in that class?
Why HttpServlet class is declared as abstract even there is no abstract method in
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Why HttpServlet class is declared as abstract even there is no abstract method in that class?
It’s because it follows the Template Method design pattern. The
doXxx()methods have all default behaviours of returning a HTTP 405 Method Not Implemented error. If those methods were all abstract, you would be forced to override them all, even though your business requirements don’t need it at all. It would only result in boilerplate code and unspecified/unintuitive behaviour.