Sending errors

package com.ack.web.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class SendingErrors extends HttpServlet {

  public void doGet( HttpServletRequest req, HttpServletResponse res )

      throws ServletException, IOException {

    res.setContentType( "text/html" );

    PrintWriter pw = res.getWriter();

    // response buffer is cleared before error is sent

    pw.println( "this text will be cleared and not sent to the client" );

    // send error status back to client

    res.sendError( res.SC_INTERNAL_SERVER_ERROR,

                   "application error - we're stumped!" );

    // but this line is executed; use 'return' where appropriate

    pw.println( "however, this is line is executed and sent to client" );

  }

}