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Listing 2-3. log4j.properties #set the level of the root logger to DEBUG (the lowest level) and #set its appender #as an appender named testAppender log4j.rootLogger = DEBUG, testAppender #set your own logger log4j.logger.com.apress.logging.log4j=DEBUG,testAppender #set the appender named testAppender to be a console appender log4j.appender.testAppender=org.apache.log4j.ConsoleAppender #set the layout for the appender testAppender log4j.appender.testAppender.layout=org.apache.log4j.PatternLayout log4j.appender.testAppender.layout.conversionPattern=%p-%m%n In this configuration file, we have defined our own logger, com.apress.logging.log4j, and assigned it the level DEBUG and the appender testAppender. The appender testAppender is again defined to be an org.apache.log4j.ConsoleAppender with a conversion pattern of %m%n, which means the logging message will be followed by a newline character and printed to its default output stream, System.out. The %p sign will print the level of the logging message as a part of the output. Please refer to 4 for a detailed discussion on the different formatting options available. The program in Listing 2-4, SimpleLogging.java, is intended to print a simple debugging message. The main point to take away is that the Logger will be configured through the log4j. properties file defined in Listing 2-3.

The usual way to provide usage information in a build file is with <echo> tasks in the default target of the build. When the user runs Ant with no targets as arguments, the <echo> tasks display whatever information the writer of the build file has provided. The drawback to this method is a high maintenance cost. Build files can change quite fast when development is underway, and maintaining the usage information can sometimes fall by the wayside. Typos can easily creep into this method, especially if many similarly named targets appear in the build file. Neat formatting can also be a problem. You ll solve all this by using Ant s own usage information mechanism. When you use the -projecthelp command-line option, Ant s org.apache.tools.ant.Main class uses its printDescription() and printTargets() methods to display the build s description and main targets. (See 3 for more about Ant s command-line options.) The Main class does all the work of generating target names and descriptions and formats them for display. This removes chances of typos and messy formatting while ensuring the list of targets is always up to date. The task will have a single, optional element called buildfile, which points to the build file from which you want to obtain the usage data. If you want to use the task to display the current build s targets, you can use the ant.file built-in property, which refers to the current build file: <projecthelp buildfile="${ant.file}"/>

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jQuery is now included by default when creating new web sites in Visual Studio 2010 and consists of a handful of .js files in the project solution. It is also capable of providing consistent client-side experiences in Internet Explorer, Firefox, Safari, Opera, and Chrome. The jQuery site (http://www.jquery.com) is an excellent resource for digging into the jQuery API as well as for exploring community contributions and plug-ins.

<sql driver="${driver.name}" url="${database.root}" userid="${database.user}" password="${database.password}"> <classpath refid="build.classpath"/> <transaction src="${src.shared.conf}/${drop.sql}"/> <transaction src="${src.shared.conf}/${create.sql}"/> <transaction src="${src.shared.conf}/${insert.sql}"/> </sql> </target> In this case, the drop.sql file contains a DROP DATABASE IF EXISTS statement to ensure that the database is clean before you create and insert the data. The <transaction> nested elements take only the src attribute, which behaves in the same way as the src attribute of the <sql> task. You can also place SQL in the body of a <transaction> element, in which case the src attribute is ignored. The <sql> task will run the SQL statements from the files in the order they have been specified. This ensures that any DROP and CREATE statements operate in the correct order. The <classpath> element adds the MySQL connector that you use elsewhere in the build to the classpath.

Listing 2-4. SimpleLogging.java package com.apress.logging.log4j; import org.apache.log4j.*; public class SimpleLogging { /** Creates a new instance of SimpleLogging */ public SimpleLogging() { } /** * @param args the command line arguments */ public static void main(String[] args) { Logger logger = Logger.getLogger(SimpleLogging.class.getPackage().getName()); logger.info("Hello this is an info message"); } } One important item to note in this simple program is how we obtain the Logger object reference. We create a logger with a namespace the same as the package name of the class, which in this case is com.apress.logging.log4j. I will provide detail on the strategy for creating a logger namespace in the Logger Object section of this chapter. For the time being, it is enough to notice that in the configuration file we have created a logger with the same name as the package name (com.apress.logging.log4j) of the SimpleLogging class. Once we get hold of the logger within the main() method, we then call the info() method on the Logger object to print the message.

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