Bad HTTP error code on wrong logging level

[rnavarropiris]

• affects version: Spring Boot 1.5.2.RELEASE
• affects endpoint: loggers actuator endpoint (POST method)

Sending a request like this:

{
"configuredLevel": "SOME_WRONG_LEVEL"
}

towards /loggers/ROOT (e.g.) leads to a 500 (internal server error) response code instead of a 400 (bad request):

{
"timestamp": 1491232221140,
"status": 500,
"error": "Internal Server Error",
"exception": "java.lang.IllegalArgumentException",
"message": "No enum constant org.springframework.boot.logging.LogLevel.SOME_WRONG_LEVEL",
"path": "/loggers/ROOT"
}

As a sidenote, since a successful POST request does not return any data, probably the 204 status code (no content) would be more adequate (imo).

[philwebb]

Closing in favor of PR #8813