on</a></code> - if the underlying implementation
                        does not support modification of this header</dd>
<dd><code>java.lang.IllegalStateException</code> - if this Part is obtained
                        from a READ_ONLY folder</dd>
<dd><code><a href="MessagingException.html" title="class in jakarta.mail">MessagingException</a></code> - for other failures</dd>
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<h4>getFileName</h4>
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