1 /*
2 * $Id: ErrorTraceTag.java 130 2004-11-28 13:00:44Z josem $
3 *
4 * Tarsis
5 * Copyright (C) 2002 Talika Open Source Group
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23 package org.talika.tarsis.taglib.util;
24
25 import java.io.IOException;
26 import java.io.PrintWriter;
27
28 import javax.servlet.jsp.JspWriter;
29 import javax.servlet.jsp.tagext.TagSupport;
30
31 /**
32 * Implementation of <util:errorTrace> tag.
33 *
34 * @author Jose M. Palomar
35 * @version $Revision: 130 $
36 */
37 public class ErrorTraceTag extends TagSupport {
38
39 // Fields
40
41 // Methods
42 /**
43 * Process the start tag for this instance.
44 *
45 * @return int SKIP_BODY.
46 * @see javax.servlet.jsp.tagext.Tag#doStartTag()
47 */
48 public int doStartTag() {
49
50 try {
51
52 JspWriter out = pageContext.getOut();
53
54 Throwable t = (Throwable) pageContext.findAttribute("javax.servlet.jsp.jspException");
55 if (t != null) {
56 out.print("<pre>");
57 t.printStackTrace(new PrintWriter(out));
58 out.print("</pre>");
59 }
60
61 }
62 catch (IOException ioe) {
63 // Bad luck
64 }
65
66 return SKIP_BODY;
67
68 }
69
70 }