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<p>
Release any resources allocated within the appender such as file handles, network connections, etc. 
<p>
It is a programming error to append to a closed appender. 
<p>
Implements <a class="el" href="classlog4cxx_1_1_appender.html#f6ee7eacbde6b379b68d954e44f6e549">Appender</a>.    </td>
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