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BrokenServlet.javaAPI DocExample3622Sun Apr 25 16:05:20 BST 2004None

BrokenServlet.java

/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: BrokenServlet.java,v 1.5 2004/04/25 20:05:19 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by Ian F. Darwin.
 * 4. Neither the name of the author nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

/*
 * BrokenServlet -- so where is it broken, anyway?
 * Servlet containers normally run a single instance of Servlets
 * with multiple Threads running in them; think what might happen
 * to the "out" field with multiple threads running.
 * 
 * @version $Id: BrokenServlet.java,v 1.5 2004/04/25 20:05:19 ian Exp $
 */
public class BrokenServlet extends HttpServlet
{
	protected PrintWriter out;

	/** Called in response to a GET request (data encoded in the URL) */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
		response.setContentType("text/html");

		out = response.getWriter(); 

		// Simulate a database lookup
		int result = 42;

		print(result);

	}

	protected void print(int result)
	{
		out.println("<!DOCTYPE html PUBLIC " +
			"\"-//W3C//DTD XHTML 1.0 Transitional//EN\"\n" +
			"\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\"\n" +
			">");
		out.println("<html>");
		out.println("<head><title>Servlet Output</title></head>");
		out.println("<body>");

		out.println("<h1>Results</h1>");
		out.println("<p>The result is " + result + "</p>");

		out.println("</body>");
		out.println("</html>");
		out.close();
	}
}