public abstract class AbstractReactiveHealthIndicator implements ReactiveHealthIndicator {
    private static final String DEFAULT_MESSAGE = "Health check failed";

    private final Log logger = LogFactory.getLog(getClass());

    private final Function<Exception, String> healthCheckFailedMessage;

    protected AbstractReactiveHealthIndicator(String healthCheckFailedMessage) {
	this.healthCheckFailedMessage = (ex) -> healthCheckFailedMessage;
    }
    @Override
    public final Mono<Health> health() {
	try {
	    return doHealthCheck(new Health.Builder()).onErrorResume(this::handleFailure);
	}
	catch (Exception ex) {
            //log the exception
             if (this.logger.isWarnEnabled()) {
		String message = this.healthCheckFailedMessage.apply(ex);
		this.logger.warn(StringUtils.hasText(message) ? message : DEFAULT_MESSAGE, ex);
	    }
	    return handleFailure(ex);
	}
    }
    ···········
}