Entity question

Question

Hy,
I have a simple question regarding entities. Are entity relationships retrieved from the database?
For example, if I have two entities:
EntityA.java
@Entity
public class EntityA {
    private EntityB b;
    @OneToOne(mappedBy="a")
    public EntityB getB() {
        return b;
    public void setB(EntityB b) {
        this.b = b;
EntityB.java
@Entity
public class EntityB {
    private EntityA a;
    @OneToOne
    public EntityA getA() {
        return a;
    public void setA(EntityA a) {
        this.a = a;
}If I retrieve an instance of EntityA, say with EntityManager#find(), can I access the EntityB instance through EntityA#getB()? And if I can, how does it work? Does the persistence provider instanciate an EntityB the first time I call EntityA#getB() and return the same reference on subsequent calls to getB()?
Thanks,
Csabi

Answer 1

Hi Frank,
I did as you suggested and moved all attributes in the properties file relating to 'the applicant' or 'the entry clearance officer' from Global into the relevant entity. One annoying thing when you are cutting and pasting a large number of attributes; once pasted they all take on the same ID.
Also, when creating entities in the properties file, why doesn't it automatically recognise the attributes that relate to it?
I then stripped and removed all attributes from all the documents in the project and recompiled them and this ended the problem
However, I'm still getting error message for the screens which collect attributes that relate to these singleton entities or the global entity (e.g. 'Screen belongs to entity 'the applicant' which is not collected from entity 'Global').
I thought that there was no restriction on collecting singletons on the same screen as attributes relating to the global entity? I'm also getting similar errors on a screen flow diagram in which these screens appear.
Regards,
Matt