Debugging JSF Applications in Java

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As much as one would like to believe otherwise, bugs happen and even test driven development can t prevent bugs from entering the system in all cases Therefore, debugging JSF applications is an important skill, proficiency at which will save time and money This section covers two different techniques for debugging JSF applications: with a source-level debugger; and without using a source-level debugger Naturally, both methods have appropriate uses and many times both will be used simultaneously For instructional clarity, the two techniques are covered separately Non-debugger debugging will be covered first, with specific attention given to the Sun and Apache JSF implementations Source-level debugging will be covered using Sun Microsystems NetBeans IDE and the Eclipse foundation s Eclipse IDE There are many other fine IDEs available, but these two were chosen to highlight here due to their popularity and open-source nature 17 will cover developing with visual tools in more detail
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Of course, the most common approach to non-debugger debugging is the simple print statement inserted liberally throughout the code This approach has many well-documented problems, including bad style, an inability to select which kinds of messages should be output, a propensity to clutter the code, the possibility of forgetting to remove the statements before shipping to the customer, and a tendency towards having incoherent information spewed to the console, the meaning of which is lost over time A marginally better approach is to use a logging mechanism This solves most of the problems of print statement style debugging but still requires discipline to get the greatest usefulness from the technology When authoring your JSF application, it s a good idea to take advantage of the logging facilities in the javautillogging package in JDK 14 and later or the Jakarta Commons Logging package in cases where the standard logging API cannot be used The javadocs for javautillogging include some useful guidelines, such as the different classes of consumers of logging information, and the kind of information they consume, as summarized in Table 16-2 These are only high-level guidelines and are not programmatically enforced in the logging API It is up to you as to how to apply the logging API to best meet your needs, but keep in mind that once a system gets deployed to the customer, the usage of the logging facility is one of the most valuable aspects of the system and it is well worth your time to learn to use the logger proficiently
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Logging Using the javautillogging Facility
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The Sun JSF 11 implementation uses Jakarta Commons Logging because it is targeted to run with a minimum JDK requirement of 13 Commons Logging is really just a thin API on top of either the JDK 14 (and later) logging, or the Jakarta Log4J logging system The benefit of Commons Logging is that it provides a single API to your application while enabling the underlying logging technology to be swapped out at runtime For example, when running on JDK 13 and earlier, Log4J can be used, but the preferred option is to
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Logging Information Consumer End User and System Administrator Field Service Engineers
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Kind of Information Logged Global system information, such as resource consumption, database connection status, and Web service interaction status Finer-grained information targeted within individual subsystems, requires some knowledge of the implementation itself When the Field Service Engineer cannot fix the problem with the available information, the development organization gets involved, and they need even finergrained information, not intended for use by the end user This is the most fine-grained logging information, intended for an individual developer to understand their own code
Development Organization
Individual Developers
TABLE 16-2 Logging Information Consumers and the Information They Consume
use the JDK 14 logging if possible A brief example of logging with the javautillogging package is shown next
package comjsfcompreftrainermodel; import javautilloggingLevel; import javautilloggingLogger; // other imports omitted public class TrainingEventRegistry { // other details omitted private static Logger log = LoggergetLogger("comjsfcompref", "comjsfcompreftrainermessagesResources"); public TrainingEventRegistry() { // populate list if (eventlist == null) { if (logisLoggable(LevelFINE)) { logfine("Event list was null - populating TE list"); } } // other details omitted } }
This example modifies the TrainingEventRegistry class, which formerly employed Systemoutprintln( ) to use the JDK 14 and later logging API The LoggergetLogger( ) call uses the two-argument version The first argument is the name of the logger This value would be placed in the loggingproperties file In this case, the entry would be
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