title: log4j: List of properties for each Appender?
body: <p>The task:</p>
  
  <p>I am trying to configure an Appender to output to a JTextArea. I believe a WriterAppender is capable of writing to an OutputStream. I have already subclassed OutputStream to produce a JTextAreaOutputStream class, which currently is populated by hijacking the output from System.out and System.err.</p>
  
  <p>The configuraton file:</p>
  
  <pre><code>    # File appender for the GUI screen
      log4j.appender.gui = org.apache.log4j.WriterAppender
      log4j.appender.gui.Target=project.gui.GUIView.logWindow   //logWindow is the name of my JTextArea
  
      # Root logger option
      log4j.rootLogger=INFO, gui
  </code></pre>
  
  <p>The error:</p>
  
  <pre><code>log4j:WARN No such property [target] in org.apache.log4j.WriterAppender.
  </code></pre>
  
  <p>The question:</p>
  
  <p>Anyone know where I can identify the valid set of properties per Appender?</p>