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Most commercial integrated development environments (IDEs) provide some kind of debugger that enables you to step through the execution of a Java class, examining and, possibly changing, the values of variables The JDK includes a command line debugger named jdb, which performs these same functions, more or less While these tools can be useful, they have several drawbacks when used to debug JSP code To begin with, JSP pages don t map closely to their byte code equivalents They may consist of scriptlets, directives, expressions, HTML, and custom tags If you re really interested in line-by-line execution tracing, you would need to debug with the generated servlet source code, not the jsp file In addition, JSP classes are loaded and run in a separate virtual machine controlled by the servlet engine, possibly linked to a Web server To debug an individual class, starting the whole servlet engine in debug mode is necessary You need to verify all the same classpath entries are active, the same ports are used, and so on Given that you can even figure out how to do this, it tends to make the debug environment very

1 This is a method in the ServletContext class, but it s also available as a convenience method of GenericServlet, from which most JSP pages derive log() is preferable to Systemoutprintln() because it s vendor-independent and provided by all servlet containers

17:

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different from the actual run-time environment Likewise, substantial timing differences between the two environments may cause timeouts and race conditions that have nothing to do with the problem being debugged In practical terms, you can do little with a line-by-line debugger that you can t do with the log() method (or Systemoutprintln(), for that matter) Any variable you might examine at a breakpoint can just as easily be written to the servlet log You can stop execution at any point and produce a stack trace simply by throwing an exception Given JSP s automatic compilation and the browser refresh button, you can probably do several iterations with new message points faster than you can start the IDE and bring up the servlet engine in debug mode In this section, you learn to develop three tools that are less intrusive and better adapted to the HTTP request-handling environment Used in conjunction with log() method for execution tracing, they can help both in isolating errors and verifying fixes

When an HTML form is used to send request parameters to a JSP or servlet, an obvious testing requirement is being able to know what parameters it sends and what their value is This isn t always obvious If a <SELECT> element allows multiple selections, what is the value of the request parameter If a TEXT input element isn t filled in, will it be passed as a blank or null What about check boxes that don t specify a VALUE attribute An easy way to find out is to use a debugging JSP page that captures the request parameters and displays them as name/value pairs in tabular form The following JSP page (Echojsp) shows how this can be done:

<%@ page session="false" %> <%@ page import="javautil*" %> <HTML> <HEAD><TITLE>Form Parameters</TITLE></HEAD> <BODY> <H3>Form Parameters</H3> <TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0"> <TR><TH WIDTH=200>Name</TH><TH WIDTH=200>Value</TH></TR> <% Enumeration enames = requestgetParameterNames(); while (enameshasMoreElements()) { String name = (String) enamesnextElement(); String[] values = requestgetParameterValues(name); if (values != null) { for (int i = 0; i < valueslength; i++) { String value = values[i]; %><TR><TD><%= name %></TD><TD><%= value %></TD></TR><% JSP IN ACTION

Echojsp gets a list of all the parameter names from the request object, and then loops through the list and prints the name and value(s) of each one The only wrinkle is a parameter may have more than one value For example, groups of check boxes can have the same name but different value attributes The servlet API takes care of this, however, by providing a getParameterValues() method in the request object that returns an array of values Figure 17-2 shows an HTML form with several types of input elements The JSP page that generates the form is listed in the following:

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