Hi. I have a problem with insert and updating a reference in the same
entity.
Im trying to insert a new object (Exam) that has a reference to another
object (Person) and at the same time i want to update an attribute
(birthDate) of the Person object. The update never happens although i
set CascadeType to ALL. The only way this works is doing a persist and
after that a merge operation. Is this normal? Do i have to change
something??
I dont like the idea of a "manual update" using merge in the Person object
because i don't know how many objects (child object of Exam) the user want
to update.
Entities:
public class Exam{
@ManyToOne(cascade= CascadeType.ALL)
@JoinColumn(name = "person_id")
public Person person;
......
}
public class Person{
private Date birthDate;
@OneToMany(mappedBy = "person")
private List<Exam> exams
.......
}
public class SomeClass{
public void someMethod(){
exam = new Exam()
person.setBirthDate(new Date());
exam.setPerson(person);
someEJB.saveExam(exam);
}
}
public class someEJB(){
public void saveExam(Exam exam){
ejbContext.getUserTransaction().begin();
em.persist(exam);
//THIS WORKS
em.merge(exam.getPerson());
ejbContext.getUserTransaction().commit();
}
}
Do i have to use the MERGE method for every child object?
Here is the same question from other user:
http://stackoverflow.com/questions/11029260/jpa-with-jta-persist-entity-and-merge-cascaded-child-entities
