msg</code> - a <code>String</code> specifying the descriptive message, which can be written to a log file or displayed
 for the user.</dd>
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<h4>UnavailableException</h4>
<pre>public&nbsp;UnavailableException(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;msg)</pre>
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