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It is very fast. Java routines such as the Java compiler or the code to make a JAR file can all start inside the Ant JVM, reducing process startup delays. Ant tasks are also designed to do dependency checking to avoid doing any more work than necessary. It integrates tightly with the JUnit test framework for XP-style unit testing. It is easily extensible using Java. It has built-in support for J2EE development, such as EJB compilation and packaging. It addresses the deployment problems of Java projects: FTP, Telnet, application servers, SQL commands; all can be used for automated deployment It is the de facto standard for most open source Java projects, such as Apache Tomcat and Apache Xerces. Many application servers even ship with embedded versions of Ant for deployment. Because Ant understands testing and deployment, it can be used for a unified buildtest-deploy process, either from a single command on the command-line or a button press on an Ant-aware Java IDE, such as NetBeans, Eclipse, IDEA, and jEdit. In a software project experiencing constant change, an automated build can provide a foundation of stability. Even as requirements change and developers struggle to catch up, having a build process that needs little maintenance and remembers to test everything can take a lot of housekeeping off developers shoulders. Ant can be the means of controlling the building and deployment of Java software projects that would otherwise overwhelm a team.
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To understand Ant, you need to understand the core concepts of Ant build files. The overall design goals aimed at meeting the core need a portable tool for building and deploying Java projects are as follows: Simplicity Ant should be simple for a competent programmer to use. Understandability Ant should be easy for new users to understand. Extensibility Ant should be easy to extend. Ant mostly meets these goals. A complex build process may still look complicated, but it will be manageable. The use of XML as a file format can be intimidating to anyone who has limited experience with XML. Once you have crossed that hurdle, however, an Ant build file is easy to work with. Having the build process described in a portable text file format allows your build process to be easily communicated and shared with others. Ant meets the design goals in two key ways. First, Ant is Java-based and tries to hide all the platform details it can. It is also highly extensible in Java itself. This makes it easy to extend Ant through Java code, with all the functionality of the Java platform
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and third party libraries available. It also makes the build very fast, as you can run Java programs from inside the same Java virtual machine as Ant itself. Putting Ant extensions aside until much later, here are the core concepts of Ant as seen by a user of the tool. XML format Ant uses XML files called build files to describe how to build, test, and deploy an application. Using XML enables developers to edit files directly, or in any XML editor, and facilitates parsing the build file at run time. Using XML as the format also allows enables developers to create templates easily and to generate build files dynamically. Declarative syntax Ant is declarative. Rather than spelling out the details of every stage in the build process, developers list the high-level stages of the build, leaving Ant and its tasks to execute the high-level declaration. This keeps the build files short and understandable, and lets the Ant developers change implementation details without breaking your build files. A build file contains one project Each XML build file includes how to build, test, and deploy one project. Very large projects may be composed of multiple smaller projects, each with its own build file. A higher-level build file can coordinate the builds of the subprojects. Each project contains multiple targets Within the single project of a build file, you declare the different targets for the build process. These targets may represent actual outputs of the build, such as a redistributable file, or stages in the build process, such as compiling source or deploying the redistributable file to a remote server. Targets can have dependencies on other targets When declaring a target, you can declare which targets have to be built first. This ensures that the source gets compiled before the redistributables are built, and that the redistributable is built before the remote deployment. Targets contain tasks Inside targets you declare what actual work is needed to complete that stage of the build process. You do this by listing the tasks that constitute each stage. Each task is actually a reference to a Java class, built into Ant or an extension library, that understands the parameters in the build file and can execute the task based upon the parameters. These tasks are expected to be smart to handle much of their own argument validation, dependency checking, and error reporting.
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