title: log4j configuration file error detection
body: <p>I'm currently writing a logger utilizing log4j. Once I load in a log4j.properties or a log4j.xml file, I was wondering if there was a way to detect if the logger configuration file is valid. If it isn't valid, I was hoping to load a default setting (that's located in another file) instead.</p>
  
  <p>Thanks</p>