title: What is the result of making log4j additivity equals to true or false?
body: <p>In simple terms what is the result of making <code>additivity="true"</code> or <code>additivity="false"</code> when adding a Log4j configuration for a specific class like this?</p>
  
  <pre><code>&lt;Logger name="com.mypage.glass.TryWindow" level="INFO" additivity="true"&gt;
    &lt;AppenderRef ref="console"/&gt;
    &lt;AppenderRef ref="file"/&gt;
  &lt;/Logger&gt;
  </code></pre>