SpringDataJpa many-to-one gives NULL - spring

Question

I've got problem with my entities. I've trade to make many-to-one connection between this two entities. I'm doing it like that:
User user = new User();
user.setName("a");
user.setLastName("b");
Set<Adress> a = new HashSet<Adress>();
Adress a1 = new Adress();
Adress a2 = new Adress();
a1.setCity("a1");
a2.setCity("a2");
a.add(a1);
a.add(a2);
user.setAdress(a);
userProxy.save(user);
My entites:
#Entity
public class User {
#Id
#GeneratedValue(strategy = GenerationType.TABLE)
private Long id;
#NotNull
private String name;
#NotNull
private String lastName;
#OneToMany(mappedBy="user", cascade=CascadeType.ALL)
private Set<Adress> adress = new HashSet<Adress>();
public User(String name, String lastName) {
this.name = name;
this.lastName = lastName;
}
public User() {
}
public Set<Adress> getAdress() {
return adress;
}
public void setAdress(Set<Adress> adress) {
this.adress = adress;
}
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 Long getId() {
return id;
}
}
Second Entity
#Entity
public class Adress {
#Id
#GeneratedValue(strategy=GenerationType.TABLE)
private Long id;
private String city;
#ManyToOne
#JoinColumn(name="user_id")
private User user;
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public Long getId() {
return id;
}
}
Data in table User saves fine, but in table adress field user_id is "NULL" can anyone explain to me why is that? I've tried a lots of combinations with #ManyToOne but nothing worked for me.
For more details UserProxy:
#Service
public class UserProxyDao {
private UserDao userDao;
#Autowired
public UserProxyDao(UserDao userDao) {
this.userDao = userDao;
}
public void save(User user) {
userDao.save(user);
}
}
however if i put #NotNull on field user in Adress entity validation fails... I really dont know why is that
Caused by: javax.validation.ConstraintViolationException: validation failed for classes [pl.rd.j2ee.api.domain.Adress] during persist time for groups [javax.validation.groups.Default, ]

Answer 1

You should be able to do this in one action as long as you do this first.
a1.setUser(user);
a2.setUser(user);
You could always add User to your Address constructor and do it there.
public Address (User user) {
this.user = user;
}