Apache Ant is a Java-based command-line build tool: it reads an XML buildfile and runs the tasks you request. To understand a typical Ant build, start with four pieces: a project contains targets, targets group tasks and may depend on other targets, and properties supply reusable values such as directory paths.
How an Ant buildfile is organized
An Ant buildfile is XML. Its outer <project> element describes the build, and its <target> elements name units of work. A project can designate a default target; when you run Ant without naming a target, Ant runs that default.
Inside a target, tasks perform the actual work. The Apache Ant User Manual describes a task as “A task is a piece of code that can be executed.” Tasks can create directories, compile source files, package output, or remove generated files. A target is the named group and sequence that organizes those tasks; it is not itself a task.
How target dependencies control execution
A target can list prerequisite targets in its depends attribute. If you request a target, Ant runs its dependencies first, then the requested target. This lets a build express a sequence such as initialization, compilation, and packaging.
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depends sets execution order; it does not make the requesting target conditional on whether a dependency needed to run. If a dependency is listed, Ant schedules it as part of that target’s dependency sequence. Do not treat the attribute as an “only run this if necessary” test.
What properties do
Properties give names to values that can be reused in supported task attributes and text. A property named build, for example, can represent the compiled-output directory; refer to its value as ${build}. Property names are case-sensitive, so build and Build are different names.
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You can also provide a property when starting Ant. For example, -Dbuild=build/classes sets the value of build from the command line. This is useful when you want to override a path without editing the buildfile.
A small buildfile, explained
This example follows a common beginner sequence: set paths, create the build directory, compile Java files, and package the compiled output into a JAR. It is an illustration, not a required layout for every Java project.
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<property name="src" location="src"/>
<property name="build" location="build"/>
<property name="dist" location="dist"/>
<target name="init">
<mkdir dir="${build}"/>
</target>
<target name="compile" depends="init">
<javac srcdir="${src}" destdir="${build}"/>
</target>
<target name="dist" depends="compile">
<mkdir dir="${dist}/lib"/>
<jar jarfile="${dist}/lib/MyProject.jar" basedir="${build}"/>
</target>
</project>projectnames the build, sets its base directory to the current directory, and makesdistthe default target.- The three
propertyelements define source, compiled-output, and distribution paths. With the project base directory set to., these locations are relative to it. initrunsmkdirto create the build directory.compiledepends oninit, so Ant creates the build directory before thejavactask compiles sources fromsrcinto it.distdepends oncompile. It createsdist/liband packages the compiled files intoMyProject.jar.
To add a separate cleanup operation, define a target such as clean with a deletion task for generated directories. Keep cleanup separate from the default build unless you specifically want a build to remove output.
Install Ant and check your environment
Apache Ant 1.10.18, released September 6, 2026, is the latest release identified by Apache’s release page. The 1.10 line requires a Java 8 or later runtime. A JDK is needed to compile Java sources and to use many tasks; a JRE alone does not provide the full set of tools.
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- Install a suitable Java environment. If you will compile Java sources, install a JDK.
- Download the Ant binary distribution from the Apache Ant download page and unpack it.
- Set
ANT_HOMEto the unpacked Ant directory and add itsbindirectory toPATH. You may setJAVA_HOMEto the JDK installation directory. - Open a new shell and run
ant -versionto check that Ant can be launched.
If running ant in a directory without a buildfile reports that it cannot find one, Ant may still have launched correctly; the error indicates that it did not find a buildfile to run in that directory. Classpath configuration is a frequent source of Ant problems, so do not add a global CLASSPATH as a default installation step.
Run a buildfile and choose what Ant runs
With no arguments, Ant looks for build.xml in the current directory and runs the project’s default target. In the example above, that target is dist.
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ant— findbuild.xmlin the current directory and run the default target.ant compile— run the target namedcompileand its dependencies.ant -buildfile test.xml dist— usetest.xmland request itsdisttarget.ant -buildfile test.xml -Dbuild=build/classes dist— usetest.xml, set thebuildproperty from the command line, and requestdist.
When reading an unfamiliar build.xml, find the project’s default target first, then trace the requested target’s depends values. Within each target, read its tasks in order and resolve property references such as ${build}. That gives you the execution path from command to output.
Check release-specific security guidance
Apache reports a path-traversal issue affecting Ant’s FTP and SCP tasks in versions before 1.10.18: a malicious server could write outside the intended download target directory. Apache lists the issue as fixed in 1.10.18. This warning is specific to those tasks; consult the Apache Ant security page for the advisory and current details.
Further reading
The Apache Ant User Manual is the primary reference for buildfile syntax, targets, tasks, properties, and command-line use. For the current release and installation requirements, see Apache’s release information and installation manual.
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