title: Log4j - display full exception information including inner exception(s)
body: <p>Our log4j (properties below) gives us the Exception.getMessage(), but that's all. I need it to log the stack trace and all inner exceptions, with the stack trace for each of those.</p>
  
  <p>How do I do this?</p>
  
  <pre><code>log4j.rootLogger=DEBUG, file
  
  # Direct log messages to a log file
  log4j.appender.file=org.apache.log4j.RollingFileAppender
  log4j.appender.file.File=C:\\temp\\JavaEngine.log
  log4j.appender.file.MaxFileSize=10MB
  log4j.appender.file.MaxBackupIndex=10
  log4j.appender.file.layout=org.apache.log4j.PatternLayout
  log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%x - %m%n
  </code></pre>