jdk 1.8 지원하도록 수정

src/main/java/com/eactive/testmaster/user/entity/User.java

@@ -128,7 +128,7 @@ public abstract class User extends Auditable implements Serializable, UserDetail
     @Transient
     public Collection<? extends GrantedAuthority> getAuthorities() {
         List<GrantedAuthority> authorities = new ArrayList<>();
-        authorities.add(new SimpleGrantedAuthority(Objects.requireNonNullElse(userSecurity, "ROLE_USER")));
+        authorities.add(new SimpleGrantedAuthority((userSecurity == null || userSecurity.isEmpty())? "ROLE_USER" : userSecurity));
 
         if (this.userSecurity.equals("ROLE_ADMIN")) {
             authorities.add(new SimpleGrantedAuthority("ROLE_MANAGE_ROUTE"));