Returns:</span></dt>
<dd>the main class for the taskdef.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/tools/ant/BuildException.html" title="class in org.apache.tools.ant">BuildException</a></code> - thrown if the home directory is invalid
 or if the archive could not be found despite attempts to do so.</dd>
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