I know responding to your question can be frowned upon, but I did manage to solve this problem yesterday. Of all the options I tried I found the fastest solution was to replicate the Eclipse Runnable Jar Export Wizard. It requires the jar-in-jar-loader.zip
which can be acquired using the Runnable Jar Export Wizard… or you can find it via Google/Eclipse install.
I found this solution was fast to build (30s) and much faster to run (5s bootup cost). It also left the jar structure very neat with no exploded jars.
<target name="compile" depends="resolve">
<mkdir dir="bin"/>
<!-- Copy all non java resources since jar javac will exclude them by default. Needed for xmls, properties etc --->
<copy todir="bin">
<fileset dir="src" excludes="**/*.java" />
</copy>
<javac srcdir="src" destdir="bin" debug="true" deprecation="on">
<classpath>
<path refid="ivy.path" />
</classpath>
</javac>
</target>
<!-- Creates the runnable jar. Copies the dependencies as jar files, into the top level of a new jar.
This means nothing without a custom classloader and manifest with a jar listing -->
<target name="jar" depends="compile" description="Create one big jarfile.">
<path id="dependencies.path">
<fileset dir="lib">
<include name="**/*.jar" />
</fileset>
</path>
<pathconvert property="manifest.classpath" pathsep=" ">
<path refid="dependencies.path" />
<mapper>
<chainedmapper>
<flattenmapper />
<globmapper from="*.jar" to="*.jar" />
</chainedmapper>
</mapper>
</pathconvert>
<mkdir dir="${dist}"/>
<jar destfile="${dist}/jar/Runnable.jar" filesetmanifest="mergewithoutmain">
<manifest>
<attribute name="Main-Class" value="org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader" />
<attribute name="Rsrc-Main-Class" value="mymainclass" />
<attribute name="Class-Path" value="." />
<attribute name="Rsrc-Class-Path" value="./ ${manifest.classpath}" />
</manifest>
<fileset dir="bin" />
<zipfileset src="jar-in-jar-loader.zip" />
<zipfileset dir="lib" includes="**/*.jar*" />
</jar>
</target>
http://stackoverflow.com/questions/10238330/creating-a-runnable-jar-various-problems