@notaciones

Example of how to create a runnable jar using an ant task (also the lib jar used are going to be included in the jar file):

    <target name="create_run_jar" depends="compile">
        <jar destfile="dist/test.jar" filesetmanifest="mergewithoutmain">
    	  	<fileset dir="properties">
    	  	 	<include name="properties/*.properties"/>
    	  	</fileset>        	
            <manifest>
                <attribute name="Built-By" value="company"/>
      	      	<attribute name="Implementation-Title" value="tester"/>
      	      	<attribute name="Implementation-Version" value="1.0.0"/>			
                <attribute name="Main-Class" value="com.company.Test"/>
                <attribute name="Class-Path" value="."/>
            </manifest>
            <fileset dir="build"/>
            <zipfileset excludes="META-INF/*.SF" src="lib/activation.jar"/>
            <zipfileset excludes="META-INF/*.SF" src="lib/commons-collections-3.2.1.jar"/>
            <zipfileset excludes="META-INF/*.SF" src="lib/commons-discovery-0.2.jar"/>
            <zipfileset excludes="META-INF/*.SF" src="lib/commons-httpclient-3.0-rc2.jar"/>
            <zipfileset excludes="META-INF/*.SF" src="lib/commons-lang-2.3.jar"/>
            <zipfileset excludes="META-INF/*.SF" src="lib/commons-logging.jar"/>
            <zipfileset excludes="META-INF/*.SF" src="lib/jcert.jar"/>
            <zipfileset excludes="META-INF/*.SF" src="lib/jnet.jar"/>
            ...
        </jar>
    </target>