diff --git a/chatto/src/main/java/org/ros/chatto/security/MyUserDetailsService.java b/chatto/src/main/java/org/ros/chatto/security/MyUserDetailsService.java
index 5be621c..57cf606 100644
--- a/chatto/src/main/java/org/ros/chatto/security/MyUserDetailsService.java
+++ b/chatto/src/main/java/org/ros/chatto/security/MyUserDetailsService.java
@@ -12,14 +12,16 @@ import org.springframework.security.core.userdetails.UserDetailsService;
 import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.stereotype.Service;
 
+import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
 @Service
 @Slf4j
+@RequiredArgsConstructor
 public class MyUserDetailsService implements UserDetailsService {
 
 	@Autowired
-	private UserService userService;
+	private final UserService userService;
 
 	@Override
 	public UserDetails loadUserByUsername(final String username) {
@@ -32,11 +34,10 @@ public class MyUserDetailsService implements UserDetailsService {
 		}
 
 		Set<UserRole> userRoles = user.getUserRoles();
-		
+
 		return User.withUsername(user.getUserName())
 				.password(user.getPassword())
-				.roles(userRoles.stream()
-						.map(ur -> ur.getRole().getName())
+				.roles(userRoles.stream().map(ur -> ur.getRole().getName())
 						.toArray(size -> new String[size]))
 				.build();
 	}