<servlet>
        <servlet-name>start</servlet-name>
        <servlet-class>com.company.servletparam.StartServlet</servlet-class>
        <init-param>
            <param-name>key1</param-name>
            <param-value>value1</param-value>
        </init-param>
        <init-param>
            <param-name>key2</param-name>
            <param-value>value2</param-value>
        </init-param>
</servlet>

@WebServlet(name = "start", urlPatterns = {"/"})
public class StartServlet extends HttpServlet {

    @Override
    protected void doGet(
            HttpServletRequest req,
            HttpServletResponse resp)
            throws ServletException, IOException {
        ServletConfig servletConfig = getServletConfig();
        String value= servletConfig.getInitParameter("key");
        String value2= servletConfig.getInitParameter("key2");
    }

}