code: public static ExceptionCallback ignore() {
          return new ExceptionCallback() {
              @Override
              public void exception(FailedEventInvocation invocation) {
                  FailedEventInvocation.log(LOG, invocation);
              }
          };
      }
docs: The default {@link ExceptionCallback} which simply logs any failure but
  takes no further action.
  
  @return The callback.