code: @Override
      public void setErrorHandler(ErrorHandler handler) {
          if (errorHandlerLocked) {
              return;
          }
          if (handler == null) {
              handler = base;
          }
          this.errorHandler = handler;
      }
docs: <b>SAX1, SAX2</b>: Set the error handler for this parser.
  
  @param handler
  The object to receive error events.