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Spring Boot Antlib
There is a newer version: 3.3.5
<?xml version="1.0"?>
<antlib>

	<taskdef name="findmainclass" classname="org.springframework.boot.ant.FindMainClass" />

	<!-- unadvertised taskdef to help pull antlib resources from within the antlib.xml file -->
	<taskdef name="spring-boot-antlib-share-antlib-loader" classname="org.springframework.boot.ant.ShareAntlibLoader" />

	<macrodef name="exejar" description="Create a spring-boot executable jar">
		<attribute name="destfile" />
		<attribute name="classes" />
		<attribute name="start-class" default="" />

		<element name="resources" optional="true"
			description="includes resource collections specifying additional Java resources" />

		<element name="lib" optional="true"
			description="includes resource collections containing (jar) dependencies" />

		<sequential>
			<local name="start-class" />

			<findmainclass
				xmlns="antlib:org.springframework.boot.ant"
				property="start-class"
				mainclass="@{start-class}"
				classesroot="@{classes}" />

			<echo>Using start class ${start-class}</echo>

			<spring-boot-antlib-share-antlib-loader
				xmlns="antlib:org.springframework.boot.ant"
				refid="spring.boot.antlib.loader" />

			<local name="spring-boot.version" />

			<local name="destdir" />
			<dirname file="@{destfile}" property="destdir" />

			<echo>Using destination directory ${destdir}</echo>
			<mkdir dir="${destdir}/dependency" />

			<echo>Extracting spring-boot-loader to ${destdir}/dependency</echo>
			<copy todir="${destdir}/dependency">
				<javaresource name="META-INF/loader/spring-boot-loader-classic.jar"
					loaderref="spring.boot.antlib.loader" />
				<flattenmapper />
			</copy>

			<echo>Embedding spring-boot-loader v${spring-boot.version}...</echo>
			<jar destfile="@{destfile}" compress="false">
				<mappedresources>
					<fileset dir="@{classes}"/>
					<globmapper from="*" to="BOOT-INF/classes/*" />
				</mappedresources>
				<resources />
				<mappedresources>
					<lib />
					<globmapper from="*" to="BOOT-INF/lib/*" />
				</mappedresources>
				<zipfileset src="${destdir}/dependency/spring-boot-loader-classic.jar" />
				<manifest>
					<attribute name="Main-Class"
						value="org.springframework.boot.loader.launch.JarLauncher" />
					<attribute name="Start-Class" value="${start-class}" />
					<attribute name="Spring-Boot-Classes" value="BOOT-INF/classes/" />
					<attribute name="Spring-Boot-Lib" value="BOOT-INF/lib/" />
				</manifest>
			</jar>
		</sequential>
	</macrodef>
</antlib>