't been called yet, and the response hasn't been committed yet. If the deployment
 descriptor contains a <code>locale-encoding-mapping-list</code> element, and that element provides a mapping for the
 given locale, that mapping is used. Otherwise, the mapping from locale to character encoding is container dependent.
 <p>
 This method may be called repeatedly to change locale and character encoding. The method has no effect if called
 after the response has been committed. It does not set the response's char