rammer's Reference Guide. 
            </div></td></tr><tr data="class; public"><td><img src="../icons/pubclass.gif" title="Public class" /></td><td><a href="T_BerkeleyDB_KeyEmptyException.htm">KeyEmptyException</a></td><td><div class="summary">
            The requested key/data pair logically exists but was never explicitly
            created by the application, or that the requested key/data pair was
            deleted and never re-created. In addition, the Queue access method will
            throw a 