Spring Boot actuator healthcheck not found - spring-boot

Question

Spring Boot 2.3.8 here. My application.yml:
server:
port: 9200
error:
whitelabel:
enabled: false
ssl:
enabled: false
spring:
cache:
type: none
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://${db.hostAndPort}/${db.name}?useSSL=false&nullNamePatternMatchesAll=true&serverTimezone=UTC
username: ${db.username}
password: ${db.password}
testWhileIdle: true
validationQuery: SELECT 1
jpa:
show-sql: false
database-platform: org.hibernate.spatial.dialect.mysql.MySQL5InnoDBSpatialDialect
hibernate:
ddl-auto: none
naming:
physical-strategy: org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy
implicit-strategy: org.springframework.boot.orm.jpa.hibernate.SpringImplicitNamingStrategy
properties:
hibernate.dialect: org.hibernate.dialect.MySQL5Dialect
hibernate.cache.use_second_level_cache: false
hibernate.cache.use_query_cache: false
hibernate.generate_statistics: false
hibernate.hbm2ddl.auto: validate
management:
port: 9200
endpoint:
health:
show-details: always
endpoints:
web:
exposure:
include: prometheus
I then wrote my own custom HealthIndicator impl:
#Component
#Slf4j
public class MyAppHealthIndicator implements HealthIndicator {
#Override
public Health health() {
Health.Builder health = Health.up();
return health.build();
}
}
When I run my app, it starts up just fine. But when I go to run a curl against the health check endpoint:
$ curl -k -i -H "Content-Type: application/json" -X GET http://localhost:9200/actuator/health
HTTP/1.1 404
Vary: Origin
Vary: Access-Control-Request-Method
Vary: Access-Control-Request-Headers
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Pragma: no-cache
Expires: 0
X-Frame-Options: DENY
Content-Type: application/json
Transfer-Encoding: chunked
Date: Sun, 31 Jan 2021 01:30:39 GMT
{"timestamp":"2021-01-31T01:30:39.206+00:00","status":404,"error":"Not Found","message":"","path":"/actuator/health"}
Have I forgotten a step? Do I need to add anything? Anything wrong with my YAML file? Why can't it find my health check url?

Answer 1

You don't need a custom MyAppHealthIndicator class as Spring Boot comes with a default health indicator which is actived by default via the Endoint /actuator/health/
You're problem is the application.yml configuration where you define that you only want to expose the prometheus endpoint. But you should enable also the health endpoint:
...
endpoints:
web:
exposure:
include: health, prometheus
...
Now you can access it via: http://localhost:9200/actuator/health/
For more details see the offical docs: https://docs.spring.io/spring-boot/docs/current/reference/html/production-ready-features.html#production-ready-endpoints