BAEL-1730: Optimistic Locking in JPA

Tests for the article.

hibernate5/src/main/java/com/baeldung/hibernate/HibernateUtil.java

@@ -1,5 +1,7 @@
 package com.baeldung.hibernate;
 
+import com.baeldung.hibernate.optimisticlocking.OptimisticLockingCourse;
+import com.baeldung.hibernate.optimisticlocking.OptimisticLockingStudent;
 import com.baeldung.hibernate.pessimisticlocking.Individual;
 import com.baeldung.hibernate.pessimisticlocking.PessimisticLockingCourse;
 import com.baeldung.hibernate.pessimisticlocking.PessimisticLockingEmployee;
@@ -70,6 +72,8 @@ public class HibernateUtil {
         metadataSources.addAnnotatedClass(PessimisticLockingCourse.class);
         metadataSources.addAnnotatedClass(com.baeldung.hibernate.pessimisticlocking.Customer.class);
         metadataSources.addAnnotatedClass(com.baeldung.hibernate.pessimisticlocking.Address.class);
+        metadataSources.addAnnotatedClass(OptimisticLockingCourse.class);
+        metadataSources.addAnnotatedClass(OptimisticLockingStudent.class);
 
         Metadata metadata = metadataSources.buildMetadata();
         return metadata.getSessionFactoryBuilder()

hibernate5/src/main/java/com/baeldung/hibernate/optimisticlocking/OptimisticLockingCourse.java

@@ -0,0 +1,48 @@
+package com.baeldung.hibernate.optimisticlocking;
+
+import javax.persistence.*;
+
+@Entity
+public class OptimisticLockingCourse {
+
+    @Id
+    private Long id;
+
+    private String name;
+
+    @ManyToOne
+    @JoinTable(name = "optimistic_student_course")
+    private OptimisticLockingStudent student;
+
+    public OptimisticLockingCourse(Long id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public OptimisticLockingCourse() {
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public OptimisticLockingStudent getStudent() {
+        return student;
+    }
+
+    public void setStudent(OptimisticLockingStudent student) {
+        this.student = student;
+    }
+}

hibernate5/src/main/java/com/baeldung/hibernate/optimisticlocking/OptimisticLockingStudent.java

@@ -0,0 +1,70 @@
+package com.baeldung.hibernate.optimisticlocking;
+
+import javax.persistence.*;
+import java.util.List;
+
+@Entity
+public class OptimisticLockingStudent {
+
+    @Id
+    private Long id;
+
+    private String name;
+
+    private String lastName;
+    @Version
+    private Integer version;
+
+    @OneToMany(mappedBy = "student")
+    private List<OptimisticLockingCourse> courses;
+
+    public OptimisticLockingStudent(Long id, String name, String lastName, List<OptimisticLockingCourse> courses) {
+        this.id = id;
+        this.name = name;
+        this.lastName = lastName;
+        this.courses = courses;
+    }
+
+    public OptimisticLockingStudent() {
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Integer getVersion() {
+        return version;
+    }
+
+    public void setVersion(Integer version) {
+        this.version = version;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public List<OptimisticLockingCourse> getCourses() {
+        return courses;
+    }
+
+    public void setCourses(List<OptimisticLockingCourse> courses) {
+        this.courses = courses;
+    }
+}