changed the id from String to Long

application/module-language-school/src/main/java/org/fuseri/modulelanguageschool/user/UserRepository.java

@@ -4,5 +4,5 @@ import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 
 @Repository
-public interface UserRepository extends JpaRepository<User, String> {
+public interface UserRepository extends JpaRepository<User, Long> {
 }