Exception from Hibernate when I alter relation relationship

[webmarck]

I have been fighting with a error that I just can't see why happens - so now I ask you smart people.

I have a entitybean with a one to one connection to another entity bean.


When I try to change the username like this:

Subscriber sub = (Subscriber) em.createQuery("...").getSingleResult();
 sub.setUserName("newusername"); //notice that setUserName actually is getRoles().setUserName("newusername");
 sub.setPassword("newpassword");
 sub.getRoles().setRoles("newRole");
 //autocommit

I get the following exception:

13:01:46,730 INFO [MpSupport-web] signupStep1 error, java.lang.RuntimeException: org.jboss.tm.JBossRollbackException: Unable to commit, tx=TransactionImpl:XidImpl[FormatId=257, GlobalId=nicolai/87, BranchQual=, localId=87] status=STATUS_NO_TRANSACTION; - nested throwable: (javax.persistence.PersistenceException: org.hibernate.HibernateException: identifier of an instance of dk.niro.mpsuite.persist.SubscriberRoles was altered from oldusername to newusername)

But why??

@Entity
public class Subscriber implements Serializable{
...
@OneToOne(cascade={CascadeType.ALL}, optional=false)
@JoinColumn(name="username", unique=true)
public SubscriberRoles getRoles() {
 return roles;
}

public void setRoles(SubscriberRoles roles) {
 this.roles = roles;
}

public void setUserName(String username) {
 getRoles().setUserName(username);
}

@Transient
public String getUserName(){
 return getRoles().getUserName();
}
}

@Entity
public class SubscriberRoles implements Serializable{

private String userName;

private String roles;

public SubscriberRoles(){}

public SubscriberRoles(String username, String roles){
 userName = username;
 this.roles = roles;
}
public String getRoles() {
 return roles;
}

public void setRoles(String roles) {
 this.roles = roles;
}

@Id
public String getUserName() {
 return userName;
}

public void setUserName(String userName) {
 this.userName = userName;
}
}