code: @Override
      public void close() throws Exception
      {
          BufferedWriter writer = null;
          try
          {
              FileWriter fw = new FileWriter(file.getAbsoluteFile());
  
              writer = new BufferedWriter(fw);
  
              String header = layout.getFileHeader();
              if (header != null)
              {
                  writer.append(header);
              }
              String presentationHeader = layout.getPresentationHeader();
              if (presentationHeader != null)
              {
                  writer.append(presentationHeader);
              }
              int len = buffer.length();
              for (int i = 0; i < len; i++)
              {
                  ILoggingEvent event = buffer.get();
                  writer.append(layout.doLayout(event));
              }
  
              String presentationFooter = layout.getPresentationFooter();
              if (presentationFooter != null)
              {
                  writer.append(presentationFooter);
              }
              String footer = layout.getFileFooter();
              if (footer != null)
              {
                  writer.append(footer);
              }
          }
          finally
          {
              if(writer != null)
              {
                  writer.flush();
                  writer.close();
              }
          }
      }
docs: Close the trace and write the file
  @throws Exception if an error occurs