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@WebServlet(name="fooServlet", urlPatterns="/foo")
public class FooServlet extends HttpServlet
{
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String flip = getInitParameter("flip");
        resp.getWriter().println("<html>" +
            "<head><title>" + getServletName() + "</title></head>" +
            "<body>From " + getServletName() + ": " + flip + "</body>" +
            "</html>"
        );
    }
}

<servlet>
    <servlet-name>fooServlet</servlet-name>
    <init-param>
        <param-name>flip</param-name>
        <param-value>flop</param-value>
    </init-param>
</servlet>

[hostname]/my-service/api?myParameter1=myValue1&myParameter2=myValue2

@WebServlet(
        name = "MyServletName",
        description = "MyDescription",
        urlPatterns = {"/my-service/api"},
        initParams={
            @WebInitParam(name="myParameter1", value="Not provided"),
            @WebInitParam(name="myParameter2", value="Not provided")
        }
    )
public class MyServlet extends HttpServlet {


    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException
    {

      String parameter1 = request.getParameter("myParameter1");
      String parameter2 = request.getParameter("myParameter1");

...

public static String SOME_STRING= "stringVal";

import static something.Constants.SOME_STRING;

@WebInitParam(name=SOME_STRING ,.....)