@Override
 public void log(String message) {
   servletContext.log(MESSAGE_PREFIX + message);
   if (delegate != null) {
     delegate.log(message);
   }
 }
 @Override
 public void logDebug(String message, Throwable t) {
   if (debug) {
     servletContext.log(MESSAGE_PREFIX + message, t);
     if (delegate != null) {
       delegate.logDebug(message, t);
     }
   }
 }