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Servlet Response Send Error

import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.net.*; public class MyServlet extends HttpServlet {      public void doGet(HttpServletRequest req, HttpServletResponse res)                                throws ServletException, IOException {     res.setBufferSize(8 * 1024); // 8K buffer     res.setContentType("text/html");     PrintWriter out = res.getWriter();     int size = res.getBufferSize(); // returns 8096 or greater     // Record the default size, in the log     log("The default buffer size is " + size);     out.println("The client won't see this");     res.reset();     out.println("And this won't be seen if sendError() is called");     if (req.getParameter("important_parameter") == null) {       res.sendError(res.SC_BAD_REQUEST, "important_parameter needed");     }   } } <?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE web-app     PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"     "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd"> <web-app>     <servlet><servlet-name>MyServletName</servlet-name>              <servlet-class>MyServlet</servlet-class>                   </servlet>          <servlet-mapping><servlet-name>MyServletName</servlet-name>         <url-pattern>/index.html</url-pattern>     </servlet-mapping> </web-app>