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Before we jump into Visual Studio, let s take a look at the new features and tools that come with .NET 4. For now we ll take a quick look at each topic, effectively creating a preview of the contents of the rest of the book. Each topic will be covered in greater detail as we explore how to apply it to the design of the CMS (which you ll learn about at the end of this chapter). Some of the tools and components I detail in this chapter are separate downloads from the core 4 framework; I have provided the current links and versions for your convenience.

Note You should not run this kind of task during every build. SQL tasks are ideal parts of a configuration target, but they can slow a build if included every time. Besides, you want the data to change naturally in response to user actions and not renew every time you run Ant. You should also be aware that production environments may already have the data installed in secure configurations that deny access to the Ant process. Systems administrators may not take kindly to you repeatedly inserting data and dropping and creating tables.

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We are now ready to run this program. It is important to make sure the classpath system variable contains all the classes as well as the log4j.properties file. We can then run the program with the following command by passing the name of the configuration file to load as a system parameter: java -Dlog4j.configuration=log4j.properties com.apress.logging.log4j.SimpleLogging The appender attached to the obtained logger is org.apache.log4j.ConsoleAppender. Hence, the program in Listing 2-4 will print the following message to the console: INFO-Hello this is an info message INFO-Hello this is an info message

As always, Ant gives you the full power of the JVM to use in your build files, with the added power of Ant s properties and file sets. The example application comes with a command-line Java client that accesses the database and displays the results of the query. I ll show how to run the client with Ant for the purposes of demonstration, but it s usually better to provide a script to run a Java client. Lay users are more comfortable with a script because it encapsulates all the messy command-line options that set the classpath, and so on. Letting them loose with Ant can also mean prying eyes on your build file, which you may not want. Table 7-2 shows the attributes of the <java> task. Deprecated attributes have been omitted.

I Note The Common Language Runtime (CLR) is Microsoft s implementation of the Common Language Infrastructure (CLI). The CLI is an open standard that defines how different languages can compile to an intermediate bytecode for execution on virtual machines on various platforms. Essentially, C#, VB .NET, and other .NET languages compile to Common Intermediate Language (CIL) and are executed by the CLR. This means that any platform with an implementation of the CLR can execute your code with zero changes. This is a powerful new direction for software development and allows you an essentially platform-agnostic viewpoint as a developer; the exceptions are fringe cases involving pointers, unmanaged code, and types that deal with 32-bit versus 64-bit addresses, and the majority of the time you are unlikely to encounter them (unless unmanaged code is your thing, of course).

What Is Logging 1 Logging Is Systematic 2 Logging Is Controlled 2 Logging Information Represents the Application State 2 Advantages of Logging 3 Disadvantages of Logging 3 How Logging Works 4 Evaluating a Logging Package 5 Popular Java-Based Logging APIs 6 JDK Logging API 6 Apache log4j 6 Commons Logging API 6 The Road Ahead 7.

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