Introduce Maven in your Ant team, using ninja magics.

build.xml

<?xml version="1.0" ?>
<project default="main">
	<property name="maven_install_dir" value="maven_install" />
	<property name="maven_version" value="apache-maven-3.3.9" />

	<target name="get-maven" if="get.maven" description="Download Maven if needed">
		<mkdir dir="${maven_install_dir}" />
		<get src="http://ftp.download-by.net/apache/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.zip" dest="${maven_install_dir}/apache-maven-3.3.9-bin.zip" />
		<unzip src="${maven_install_dir}/apache-maven-3.3.9-bin.zip" dest="${maven_install_dir}" />
	</target>

	<target name="assert-maven" description="Check if Maven needs to be downloaded">
		<condition property="get.maven">
			<not>
				<available file="${maven_install_dir}/apache-maven-3.3.9-bin.zip" />
			</not>
		</condition>
		<condition property="is.windows">
			<os family="windows" />
		</condition>
		<condition property="not.windows">
			<not>
				<os family="windows" />
			</not>
		</condition>
		<antcall target="get-maven" />
	</target>

	<target name="maven-windows" if="is.windows" description="Set the path to Maven for Windows">
		<property name="maven_cmd" value=".\${maven_install_dir}\${maven_version}\bin\mvn.cmd" />
	</target>

	<target name="maven-unix" if="not.windows" description="Set the path to Maven for *nix platforms">
		<property name="maven_cmd" value="./${maven_install_dir}/${maven_version}/bin/mvn" />
		<chmod file="${maven_cmd}" perm="a+x" />
	</target>

	<target name="main" depends="assert-maven, maven-unix, maven-windows">
		<exec executable="${maven_cmd}">
			<env key="JAVA_HOME" value="${java.home}" />
			<arg value="clean" />
			<arg value="install" />
		</exec>
	</target>
</project>