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Q. Can we override service method in HttpServlet ?

You can override service method in HttpServlet also.
If you override service method in HttpServlet then call will go to service() method instead of doGet() or doPost() method.

If the jsp form you mentioned
<form name="reg" method="post">
then also call will go to service method of the servlet. Call don't go to doPost() method. you can call doPost() method explicitly from servive() method.
If the jsp form you mentioned
<form name="reg" method="get">
then also call will go to service method of the servlet. Call don't go to doGet() method. you can call doGet () method explicitly from servive() method.

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