 you want to execute an executable using a path relative to the
  project's basedir, you may need to
  use <code>vmlauncher="false"</code> on some operating systems - but
  even this may fail (Solaris 8/9 has been reported as problematic).
  The <code>resolveexecutable</code> attribute should be more
  reliable, as would be something like
<pre>
  &lt;property name="executable-full-path"
            location="../relative/path/to/executable"/&gt;
  &lt;exec executable="${executable-full-path}" ...
</pre>
</p>