Servlet Response Send Error : Response « Servlet « Java Tutorial

import javax.servlet.*;
import javax.servlet.http.*;

public class MyServlet extends HttpServlet {
  public void doGet(HttpServletRequest req, HttpServletResponse res)
                               throws ServletException, IOException {
    res.setBufferSize(8 * 1024); // 8K buffer
    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");
    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"


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25.13.1.Servlet Response Send Redirect
25.13.2.Servlet Response Send Error
25.13.3.Servlet OutputStream
25.13.4.Get Servlet OutputStream from Servlet Response
25.13.5.HTTP Response