@Entity
public class Course {

    // Primary key and other fields would be here...


    @OneToMany(mappedBy = "course", fetch = FetchType.LAZY)
    private List<Student> students;

    // Getters, setters...

}

@Entity
public class Student {

    // Primary key and other fields...

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "course_id")
    private Course course;

    // Getters and setters...

}

Course course;
// Fetch the course from persistence
Student student = new Student("John Doe");
student.setCourse(course);
course.getStudents().add(student);