Thank you for helping me!
I found the error I did. In my code where I assigned all objects I missed to
add the B item to the list of B:s in A. Doing this resolved my problem. The
following steps must be applied:
1. Create A
2. Create all B:s and add them to A
3. Create C by using A and the expected B
I missed to add the B, that was mapped from A and C, to A. Kind of stupidness
from my side. I put my working code here for all of you who are interested in
this:
| @Entity
| @Table(name = "A")
| public class A implements Serializable {
|
| @Id
| @GeneratedValue(strategy = GenerationType.IDENTITY)
| @Column(name = "Aid")
| private Integer id;
|
| @OneToOne(cascade = CascadeType.ALL, mappedBy = "a", fetch =
FetchType.EAGER)
| private C c;
|
| @OneToMany(cascade = CascadeType.ALL, mappedBy = "a", fetch =
FetchType.EAGER)
| private List<B> bs = new ArrayList<B>();
|
| ...
|
| protected A() {};
|
| public A(...) {
| ...
| }
|
| public List<B> getBs() {
| return bs;
| }
|
| public void setBs(List<B> bs) {
| this.bs = bs;
| }
|
| public void addB(B b) {
|
| b.setA(this);
| this.bs.add(b);
| }
|
| public C getC() {
| return c;
| }
|
| public void setC(C c) {
| c.setA(this);
| this.c = c;
| }
|
| ...
| }
|
|
|
| @Entity
| @Table(name = "B")
| public class B implements Serializable {
|
| @Id
| @GeneratedValue(strategy = GenerationType.IDENTITY)
| @Column(name = "Bid")
| private Integer id;
|
| @ManyToOne
| @JoinColumn(name = "Aid", nullable = false)
| private A a;
|
| ...
|
| protected B() {};
|
| public B(A a, ...) {
|
| this.a = a;
| ...
| }
|
| public Integer getId() {
| return id;
| }
|
| public void setId(Integer id) {
| this.id = id;
| }
|
| public A getA() {
| return a;
| }
|
| public void setA(A a) {
| this.a = a;
| }
|
| ...
| }
|
|
|
| @Entity
| @Table(name = "C")
| public class C implements Serializable {
|
| @Id
| @GeneratedValue(strategy = GenerationType.IDENTITY)
| @Column(name = "Cid")
| private Integer id;
|
| @OneToOne
| @JoinColumn(name = "Aid", nullable = false)
| private A a;
|
| @OneToOne
| @JoinColumn(name = "Bid", nullable = false)
| private B b;
|
|
| protected C() {};
|
| public C(A a,
| B b) {
|
| this.a = a;
| this.b = b;
| }
|
| public Integer getId() {
| return id;
| }
|
| public void setId(Integer id) {
| this.id = id;
| }
|
| public A getA() {
| return a;
| }
|
| public void setA(A a) {
| this.a = a;
| }
|
| public B getB() {
| return b;
| }
|
| public void setB(B b) {
| this.b = b;
| }
| }
|
|
Finally some points:
- There is an error in my first post. "... mappedBy="A"..." shall be "...
mappedBy="a"...". My mistake in the post.
- This fix requires the C table to carry its own primary key, a Cid.
- As you say Felix, it doesn't look good to point out Aid twice. This shall
work, but it seems to be a bug in hibernate (see
http://forum.hibernate.org/viewtopic.php?t=970823). JBoss 4.0.5.GA is using
Hibernate 3.2, it shall be fixed in Hibernate 3.3.0. I haven't tried the join
table, I will check it out and se what more it gives to me. It might be a kind
of shortcut for my C table mapping.
Thanks again for quick response.
Best
Oskar
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