title: Line number not showing?
body: <p>I have discovered some issues in my program.<br/>
  I was using log4j for logging,<br/>
  however, inside the log file, all line number become "?".<br/></p>
  
  <p>The conversation pattern is as follow:<br/></p>
  
  <pre><code>log4j.appender.file.layout.ConversionPattern=%d{dd/MM/yyyy HH:mm:ss,SSS} %5p %c: %L - %m%n
  </code></pre>