MS - chapter 3 - This application has no explicit mapping for /error, so you are seeing this as a fallback.

 You  may see below error

When you try default page, or click link in Eureka server {http://{yourHostname}:8203/actuator/info}, this will lead to error page.

Error

eg: http://{yourHostname}:8203/actuator/info

Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Thu Jun 15 08:12:28 IST 2023

There was an unexpected error (type=Not Found, status=404).

No message available

I have seen some have answered to solve this by adding simple controller for "/" mapping

package com.demo.micro.student.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HomeController {

    @RequestMapping("/")
    public String home(){
        return "Hello World";
    }
}

this won't actually solve the issue

Solution

add below property to application.properties

#Enable actuator and all
management.endpoints.web.exposure.include=*

As of Spring Boot 2.0.0.RELEASE the default prefix for all endpoints is /actuator So if you want to check the health of an application, you should go to /actuator/health

To make an actuator endpoint available via HTTP, it needs to be both enabled and exposed.

By default:

• only the /health and /info endpoints are exposed.
• all endpoints but /shutdown are enabled (only /health and /info are exposed)

Above property will enable all.