Setting fetchType to Lazy

application/module-language-school/src/main/java/org/fuseri/modulelanguageschool/course/Course.java

@@ -26,7 +26,7 @@ public class Course extends DomainObject {
     @Enumerated(EnumType.STRING)
     private ProficiencyLevel proficiency;
 
-    @ManyToMany
+    @ManyToMany(fetch = FetchType.LAZY)
     private List<User> students;
 
     private boolean finished = false;

application/module-language-school/src/main/java/org/fuseri/modulelanguageschool/lecture/Lecture.java

 package org.fuseri.modulelanguageschool.lecture;
 
-import jakarta.persistence.Entity;
-import jakarta.persistence.ManyToMany;
-import jakarta.persistence.ManyToOne;
-import jakarta.persistence.Table;
+import jakarta.persistence.*;
 import lombok.*;
 import org.fuseri.modulelanguageschool.common.DomainObject;
 import org.fuseri.modulelanguageschool.course.Course;
@@ -30,13 +27,13 @@ public class Lecture extends DomainObject {
     private String topic;
     private Integer capacity;
 
-    @ManyToOne
+    @ManyToOne(fetch = FetchType.LAZY)
     private Course course;
 
-    @ManyToOne
+    @ManyToOne(fetch = FetchType.LAZY)
     private User lecturer;
 
-    @ManyToMany
+    @ManyToMany(fetch = FetchType.LAZY)
     private List<User> students;
 
     public Lecture(LocalDateTime lectureFrom, LocalDateTime lectureTo,

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

 package org.fuseri.modulelanguageschool.user;
 
-import jakarta.persistence.ElementCollection;
-import jakarta.persistence.Entity;
-import jakarta.persistence.JoinColumn;
-import jakarta.persistence.JoinTable;
-import jakarta.persistence.ManyToMany;
-import jakarta.persistence.Table;
+import jakarta.persistence.*;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.EqualsAndHashCode;
@@ -40,14 +35,14 @@ public class User extends DomainObject {
 
     private String lastName;
 
-    @ManyToMany
+    @ManyToMany(fetch = FetchType.LAZY)
     @JoinTable(name = "user_course",
             joinColumns = @JoinColumn(name = "student_id"),
             inverseJoinColumns = @JoinColumn(name = "course_id")
     )
     private Set<Course> courses;
 
-    @ElementCollection
+    @ElementCollection(fetch = FetchType.LAZY)
     private Map<Language, ProficiencyLevel> languageProficiency;
 
     public User(String username, String email, String firstName, String lastName) {