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Spring / Spring Security

What is security principal?

SecurityContextHolder stores the principal currently interacting with the application. The principal is the currently logged in user that you retrieve it through the security context.

Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();

if (principal instanceof UserDetails) {
String username = ((UserDetails)principal).getUsername();
} else {
String username = principal.toString();
}

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