How can I avoid needing to specify a fully qualified class name on the command line when delivering a single jar and using reflection?
<property name="build" location="build"/>
<property name="jars" location="${build}/jars"/>
<property name="classes" location="${build}/classes"/>
<property name="src" location="src/dom/place/proj"/>

<target name="utility">
 <javac
    includeantruntime="false"
    srcdir="${src}/utility" destdir="${classes}"
    classpathref="classpath" />
 <jar
    destfile="${jars}/utility.jar"
    basedir="${classes}"
    includes="**/utility/**" />
</target>

<target name="tokenizers" depends="utility">
 <javac
    includeantruntime="false"
    srcdir="${src}/tokenizers"
    destdir="${classes}"
    classpathref="classpath" />
 <jar
    destfile="${jars}/tokenizers.jar"
    basedir="${classes}"
    includes="**/tokenizers/**" />
</target>

<target name="tokenize-file-jar">
 <jar destfile="${dist}/TokenizeFile.jar">
  <zipgroupfileset dir="${jars}">
    <include name="utility.jar"/>
    <include name="tokenizers.jar"/>
  </zipgroupfileset>
  <manifest>
    <attribute name="Main-Class" value="dom.place.proj.tokenizers.TokenizeFile"/>
  </manifest>
 </jar>
</target>

prompt > unzip -l TokenizeFile.jar
Archive:  TokenizeFile.jar
Length     Date   Time    Name
--------    ----   ----    ----
        0  01-11-12 11:07   META-INF/
      286  01-11-12 11:07   META-INF/MANIFEST.MF
        0  01-11-12 10:16   dom/
        0  01-11-12 10:16   dom/place/
        0  01-11-12 10:16   dom/place/proj/
        0  01-11-12 10:16   dom/place/proj/tokenizers/
     1737  01-11-12 11:07   dom/place/proj/tokenizers/FileTokenizer.class
     1411  01-11-12 11:07   dom/place/proj/tokenizers/PorterTokenizer.class
     1754  01-11-12 11:07   dom/place/proj/tokenizers/TokenizeFile.class
      992  01-11-12 11:07   dom/place/proj/tokenizers/Tokenizer.class
        0  01-11-12 10:16   dom/place/proj/utility/
     1106  01-11-12 11:07   dom/place/proj/utility/BoundedExecutor.class
     3128  01-11-12 11:07   dom/place/proj/utility/Converter.class
     1107  01-11-12 11:07   dom/place/proj/utility/ExceptionHandler.class