Role.java

@RequiredArgsConstructor
public enum Role implements GrantedAuthority {
   ADMIN(Code.ADMIN),
   USER(Code.USER);

   private final String authority;

   @Override
   public String getAuthority() {
       return authority;
   }

   @NoArgsConstructor(access = AccessLevel.PRIVATE)
   public static class Code {
       public static final String ADMIN = "ROLE_ADMIN";
       public static final String USER = "ROLE_USER";
   }
}