title: Specify logger level in log4j2 via JMX for unregistered loggers
body: <p>I use JMX client to change logger level in log4j programatically. It works fine, but how can specify logger level for non-registered (that aren't specified in log4j2.xml) loggers?</p>
  
  <p>For instance I have the following loggers block:</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;Loggers&gt;
          &lt;Root level="WARN"&gt;
              &lt;AppenderRef ref="async"/&gt;
          &lt;/Root&gt;
          &lt;Logger name="com.example" level="INFO" /&gt;
          &lt;Logger name="com.example.java" level="INFO" /&gt;
  &lt;/Loggers&gt;
  </code></pre>
  
  <p>I have "com.example" and "com.example.java" loggers available for using via JMX. But what if I need specify logger level for "com.example.java.Runner" or for "com.example.groovy"? </p>