title: LogBack default charset for LayoutWrappingEncoder?
body: <p>The Logback 1.1.3 <a href="http://logback.qos.ch/manual/encoders.html" rel="noreferrer"><code>LayoutWrappingEncoder</code> documentation</a> doesn't indicate what the default charset will be if the user doesn't set it, but the source code says:</p>
  
  <blockquote>
    <p>By default this property has the value null which corresponds to the system's default charset.</p>
  </blockquote>
  
  <p>However I'm using a <code>PatternLayoutEncoder</code> (with a <code>RollingFileAppender</code>), and it seems to be outputting files in UTF-8 (and the default charset of my Windows 7 Professional system is probably not UTF-8).</p>
  
  <p>UTF-8 output is actually what I want, but I want to make sure I'm not getting this by chance, since the documentation seems to indicate something else. So why is Logback giving me UTF-8 output when I haven't explicitly specified a charset?</p>