Mdofiy 관리자페이지 게시글내역 히스토리 볼수 있도록 수정, securityConfig 순환참조 오류 수정

src/main/java/com/example/springsecuritystudy/config/UserDetailServiceImpl.java

@@ -0,0 +1,26 @@
+package com.example.springsecuritystudy.config;
+
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.example.springsecuritystudy.common.UserNotFoundException;
+import com.example.springsecuritystudy.user.UserRepository;
+
+import lombok.RequiredArgsConstructor;
+
+@Service
+@RequiredArgsConstructor
+@Transactional(readOnly = true)
+public class UserDetailServiceImpl implements UserDetailsService {
+
+	private final UserRepository userRepository;
+
+	@Override
+	public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
+		return userRepository.findByUsername(username)
+				.orElseThrow(UserNotFoundException::new);
+	}
+}