code: private void log(Writer writer) throws IOException {
  		if(writer==null) {
  			log.write("null");
  		} else if(writer instanceof LoggingWriter) {
  			LoggingWriter loggingWriter = (LoggingWriter)writer;
  			log.write("writer[");
  			log.write(Long.toString(loggingWriter.getId()));
  			log.write(']');
  		} else if(writer instanceof EncoderWriter) {
  			EncoderWriter encoderWriter = (EncoderWriter)writer;
  			log.write("new EncoderWriter(");
  			log(encoderWriter.getEncoder());
  			log.write(", ");
  			log(encoderWriter.getOut());
  			log.write(')');
  		} else {
  			String classname = writer.getClass().getName();
  			if(classname.equals("org.apache.jasper.runtime.BodyContentImpl")) log.write("bodyContent");
  			else if(classname.equals("org.apache.jasper.runtime.JspWriterImpl")) log.write("jspWriter");
  			else log.write(classname);
  		}
  	}
docs: Provides detailed logging for a writer.