Builds a jar

build.info

#Sat, 12 Oct 2013 23:12:10 +0100
major=0
minor=1
build=3

build.xml

<project name="ScrapeRequest" basedir="." default="jar">

    <property name="build" value="build"/>
    <property file="build.info" prefix="info"/>

    <target name="clean">
        <delete dir="${build}"/>
    </target>

    <target name="init" depends="clean">
        <mkdir dir="${build}"/>
    </target>
    <target name="compile" depends="init">
        <!-- Compile the java code -->
        <javac srcdir="src" destdir="${build}" />
    </target>
    <target name="incrementBuild">
        <propertyfile file="build.info">
            <entry key="build" operation="+" value="1" type="int"/>
        </propertyfile>
    </target>
    <target name="buildJar" depends="compile,incrementBuild">
        <!-- Build the jar file -->
        <jar basedir="${build}" destfile="ScrapeRequest-${info.major}.${info.minor}.${info.build}.jar"/>
    </target>
    <target name="jar" depends="buildJar">
        <!-- jar has been built, now just remove the build directory so that it doesn't pollute the dev environment -->
        <delete dir="${build}"/>
    </target>
</project>

Without the type="int", a 1 gets appended to the end of the value, so you end up with 01111... etc. The int forces it to actually increment the value as a number.