(Fixed) Oauth server works yet in endpoint Principal is null [SPR-17132]

[spring-projects-issues]

Martijn opened SPR-17132 and commented

I have build a oauth2 server using Spring boot 2.0.8 which uses Spring 5.0.8. The oauth server works and I receive an access token. I can verify that my ResourceServerConfigurerAdapter works because when I access a url with the incorrect access token I get an authentication error so the authentication server + resource server section works. 

I want to create an endpoint that other microservices use call to get the current loggedin user. So I created an endpoint like this:

@GetMapping("/user") 
public Principal user( Principal principal) {
  return auth; 
}

I startup Postman, request a new access token, do a call to /user with the access token supplied as bearer token and start the request. No matter what I do principal is always null. I have even added @AuthenticationPrincipal to the Principal principal argument and yet principal is null. I have also tried the following:

SecurityContextHolder.getContext().getAuthentication()

This also returns null. How is it possible that Principal and getAuthentication() return null?

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Affects: 5.0.8

[spring-projects-issues]

Martijn commented

This issue can be deleted. It is an error on my behalf.