Apache Jakarta and Beyond: A Java Programmer's Introduction by Larne Pekowsky

By Larne Pekowsky

The Jakarta venture includes many robust open resource instruments for the Java platform, yet such a lot lack tutorials or transparent on-line aid documentation. Apache Jakarta and past is the definitive consultant to utilizing Jakarta and different Java open resource instruments to strengthen internet functions extra successfully and effectively.In this example-packed ebook, readers will findAn advent to the philosophy in the back of the Jakarta projectDetails on many ready-to-use Java toolkits, together with Ant, JUnit, Cactus, Log4J, POI, Tomcat, James, Struts, and moreIn-depth directions on the best way to strengthen with a number of toolkitsA consultant to splitting paintings alongside traces of "what is obtainable" and "what needs to be written"Best practices for improvement, resembling the model/view/controller paradigmNumerous examples that may function templates for readers' personal tasks"

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This may take a while. 8. Finally, the program is run. In practice the best possible outcome of a first run is often a runtime exception. At least the exception reports a specific line number to examine. Return to step 4. 9. Once the program runs cleanly, it may still produce incorrect answers. The developer then has two options: start adding println() statements throughout the code to track intermediate state or fire up jdb, the Java debugger included with the JDK. Neither option is particularly attractive.

Checking for Properties While some environment variables like JAVA_HOME will always be set, a build file will often need additional variables to be set by the person running the build. servlet packages. Often these will be provided by Tomcat (discussed in Chapter 18), in which case the build file needs to know where Tomcat is installed. This information is usually present in a environment variable called TOMCAT_HOME, but there is no way to be sure in advance that this variable is set. Ant can check for the presence of a property with the fail task, which takes the name of the property to require and a message to display when that property is not set.

These may or may not be concerns, depending on the nature of the project. A project that is meant to be released in source form, such as Ant itself, must be able to be compiled on any machine, including those with different operating systems. On the other hand, a project that will be used only within a company or by an individual can safely assume directories will always be where they were initially. Ant provides a mechanism called properties by which build files can obtain information about the environment in which they are running.

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