Spring Security : How to get the current logged in user object from spring security?

 Since version 5.2 you can use CurrentSecurityContext annotation to get the current user authentication:

@GetMapping("/authentication")
public Object authentication(@CurrentSecurityContext(expression="authentication")
                             Authentication authentication) {
    return authentication.getDetails();
}

or even:

@GetMapping("/hello")
public String hello(@CurrentSecurityContext(expression="authentication.name")
                    String username) {
    return "Hello, " + username + "!";
}

https://stackoverflow.com/questions/32052076/how-to-get-the-current-logged-in-user-object-from-spring-security