title: Log4j show package name
body: <p>Right now for my ConversionPattern I have:</p>
  
  <pre><code>log4j.appender.A1.layout.ConversionPattern=%d{yyyy MMM dd HH:mm:ss,SSS} %5p [%t] (%F:%L) - %m%n
  </code></pre>
  
  <p>What I'd like to do is also include the full package name with the class (%F:%L) but I can't find <a href="http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/PatternLayout.html" rel="noreferrer">any config to do so in the docs</a>. I do understand that this will be slower, but it's only for debugging and not when the system will be in production.</p>