[Java Spring Data] JPA Example with unit test

package com.example.university.domain;

import javax.persistence.*;

/**
 * JPA Entity for a Course offered at the University.
 * <p>
 * Created by maryellenbowman.
 */
@Entity
@Table(name = "COURSE")
public class Course {
    @Id
    @GeneratedValue
    private Integer id;

    @Column
    private String name;

    @ManyToOne
    @JoinColumn
    private Department department;

    public Course(String name, Department department) {
        this.name = name;
        this.department = department;
    }

    protected Course() {
    }

    public Integer getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public void setDepartment(Department department) {
        this.department = department;
    }

    @Override
    public String toString() {
        return "Course{" +
                "id=" + id + ", name='" + name + '\'' + ", department=" + department.getName() + '}';
    }
}

package com.example.university.domain;

import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;

/**
 * JPA Entity for a Department of study at the University.
 * <p>
 * Created by maryellenbowman
 */
@Entity
@Table(name = "Department")
public class Department {
    @Id
    @GeneratedValue
    private Integer id;

    @Column
    private String name;

    @OneToMany(mappedBy = "department", fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    private List<Course> courses = new ArrayList<>();

    public Department(String name) {
        this.name = name;
    }

    protected Department() {
    }

    public Integer getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public void addCourse(Course course) {
        courses.add(course);
    }

    @Override
    public String toString() {
        return "Department{" + "id=" + id + ", name='" + name + '\'' +
                ", courses=" + courses + '}';
    }
}

package com.example.university.domain;

import javax.persistence.Column;
import javax.persistence.Embeddable;

/**
 * Person encapsulates an individual's first and last name.
 * <p>
 * Created by maryellenbowman
 */
@Embeddable
public class Person {
    @Column
    private String firstName;

    @Column
    private String lastName;

    public Person(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

    protected Person() {
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    @Override
    public String toString() {
        return " firstName='" + firstName + '\'' +
                ", lastname='" + lastName + "\' ";
    }
}

package com.example.university;

import com.example.university.domain.Person;
import com.example.university.domain.Student;
import com.example.university.repo.StudentRepository;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

/**
 * Demonstrate Creation, Reading, Updating, and Deletion of Students with StudentRepository
 * <p>
 * Created by maryellenbowman
 */
@RunWith(SpringRunner.class)
@SpringBootTest
public class CrudRepositoryDemo {


    @Autowired
    StudentRepository studentRepository;

    /**
     * Exercise CrudRepository methods.
     */
    @Test
    public void simpleStudentCrudExample() {
        boolean fullTime = true;
        studentRepository.save(new Student(new Person("jane", "doe"), fullTime, 20));
        studentRepository.save(new Student(new Person("john", "doe"), fullTime, 22));
        studentRepository.save(new Student(new Person("mike", "smith"), fullTime, 18));
        studentRepository.save(new Student(new Person("ally", "kim"), !fullTime, 19));

        System.out.println("\n*************Original Students*************");
        studentRepository.findAll().forEach(System.out::println);

        //age up the students
        studentRepository.findAll().forEach(student -> {
            student.setAge(student.getAge() + 1);
            studentRepository.save(student);
        });

        System.out.println("\n*************Students a year older*************");
        studentRepository.findAll().forEach(System.out::println);

        studentRepository.deleteAll();
        System.out.println("\n*************Students removed*************");
        studentRepository.findAll().forEach(System.out::println);

    }


}