February 2005
Intermediate to advanced
528 pages
12h 53m
English
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13.5. Troubleshooting JSP Pages
Problem
You want to see a dump of the names and values of servlet request and HTTP session attributes and for a particular JSP page so you can troubleshoot rendering problems.
Solution
Include the debug.jsp file shown on the JSP page (see Example 13-5).
Example 13-5. JSP dump of request, session, and context data
<hr width="3px"> Debug Information:<br> <table border="1" width="50%" class="debug"> <tr> <th colspan="3" style="background:orange"> <b>Request Parameters</b> </th> </tr> <c:forEach items="${paramValues}" var="parameter"> <tr> <td><c:out value="${parameter.key}"/></td> <td colspan="2"> <c:forEach var="value" items="${parameter.value}"> <textarea rows="2" cols="50"> <c:out value="${value}"/> </textarea> </c:forEach> </td> </tr> </c:forEach> <tr> <th colspan="3" style="background:orange"> <b>Header Values</b> </th> </tr> <c:forEach items="${header}" var="h"> <tr> <td><c:out value="${h.key}"/></td> <td colspan="2"> <textarea rows="2" cols="50"> <c:out value="${h.value}"/> </textarea> </td> </tr> </c:forEach> <tr> <th colspan="3" style="background:orange"> <b>Initialization Parameters</b> </th> </tr> <c:forEach items="${initParam}" var="parameter"> <tr> <td><c:out value="${parameter.key}"/></td> <td colspan="2"> <textarea rows="2" cols="50"> <c:out value="${parameter.value}"/> </textarea> </td> </tr> </c:forEach> <tr> <th colspan="3" style="background:orange"> <b>Cookies</b> </th> </tr> <c:forEach items="${cookie}" var="mapEntry"> <tr> <td rowspan="8"><c:out ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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