code: public PrintWriter getErrorWriter() {
      // Defer creating the java.io.PrintWriter until an error needs to be
      // reported.
      if (m_pw == null) {
        m_pw = new PrintWriter(System.err, true);
      }
      return m_pw;
    }
docs: Retrieve <code>java.io.PrintWriter</code> to which errors are being
  directed.
  @return The <code>PrintWriter</code> installed via the constructor
  or the default <code>PrintWriter</code>