how to pass a javascript variable to a java servlet? [duplicate]

Answer 1

The problem is you have the post method in your ajax and you are trying to get it in the doGet() of your servlet.

Use doPost or change the method to Get in your ajax.

Answer 2

Try this:

public void doPost(HttpServletRequest request, HttpServletResponse response) 
   throws ServletException, IOException
{
    String myPostVar = request.getParameter("myPostVar");
    // ...
}