title: How to use formatted message in Log4j2 with slf4j
body: <p>Is it possible to format a log message with the syntax from <code>String.format</code> when Log4j2 is used behind slf4j?</p>
  
  <p>It seems the standard <code>MessageFactory</code> is <code>ParameterizedMessageFactory</code> which supports only <code>{}</code>.</p>