Actuator - startup endpoint is not showing up

[askvortcov]

Unable to enable startup actuator endpoint on Spring Boot 3.4.5.
Both management.endpoints.web.exposure.include=* and management.endpoint.startup.access=read_only fail.

How to reproduce:

1. Generate a new application at start.spring.io
   • with Maven/Java/3.4.5/Jar/21
   • add Spring web and Spring Boot Actuator
2. Add management.endpoints.web.exposure.include=* to application.properties
3. Compile and run application.
4. Observe 404 on curl 'http://localhost:8080/actuator/startup' -i -X GET:

HTTP/1.1 404
Vary: Origin
Vary: Access-Control-Request-Method
Vary: Access-Control-Request-Headers
Content-Type: application/json
Transfer-Encoding: chunked
Date: Wed, 21 May 2025 14:16:34 GMT

{"timestamp":"2025-05-21T14:16:34.430+00:00","status":404,"error":"Not Found","path":"/actuator/startup"}

[wilkinsona]

The startup endpoint requires the use of BufferingApplicationStartup. Judging by your reproduction steps, you are not using it. If you start your application with --debug you should see a pointer about this in the resulting condition evaluation report for StartupEndpointAutoConfiguration.