School.java
-----------------
private int school_id;
private String school_name;
private List total_students_list
Followed by setter and getter
Students.java
-------------------
private int student_id;
private String student_name;
private int school_student_FK;
Followed by setter and getter
<entity class="School" name="School">
<table name="SCHOOL"/>
<attributes>
// manual entered id
<id name="school_id">
<column name="school_id"/>
</id>
<basic name="school_name">
<column name="school_name" />
</basic>
<one-to-many name="total_students_list" fetch="EAGER" mapped-by="school" target-entity="Students">
</one-to-many>
</attributes>
</entity>
<entity class="Students" name="Students">
<table name="Students"/>
<attributes>
// manual entered id
<id name="student_id">
<column name="student_id"/>
</id>
<basic name="student_name">
<column name="student_name" />
</basic>
<many-to-one name="school" target-entity="School" >
<join-column name="school_student_FK" referenced-column-name="school_id"/>
</many-to-one>
</attributes>
</entity>
@TransactionManagement(TransactionManagementType.BEAN)
public class MyEJB
{
@PersistenceContext(unitName = "school")
EntityManager em;
@Resource
public UserTransaction userTransaction;
School school = new School();
school.setchool_id(100);
school.setschoolName("My School");
Student student= new Student();
student.setStudent_Id(10);
student.setStudentName("MyName");
Student student1= new Student();
student.setStudent_Id(20);
student.setStudentName("MyName");
List<Students> studentsList = new ArrayList<Students>();
studentsList.add(student);
studentsList.add(student1);
school.total_students_list(studentsList);
userTransaction.begin();
em.persist(school);// ** shcool is save but should save student as well**
userTransaction.commit();
}