It means that you are not implemented doGet(request,response) in your servlet.
The default method for html form is Get and Not Post.Hence the servlet is looking for doGet method and not for doPost. and one more thing to note is,the service method,looks the http method and calls that method in servlet.In this case it is Get and hence it calls doGet method.
Joined: Sep 17, 2007
You should also make sure that your form has the POST method specified..
<form action="/someServlet" method="POST"> form stuff here </form>
Joined: Apr 20, 2002
For the exam you will need to know that the Get method is the default if you do not indicate a method.