FK mapping wrong?

Question

Hello!
I creating an webapp using Java Persistence API and
i'm getting an error telling me i cannot insert NULL in a field not-null.
Ok, that's obvious, but my object has the right value to do the insert :((
What i can't understand is that the field (CD_PROJE) does not appears on the SQL
showed in the error message. So, it gives me the idea the i may be doing something wrong
in my relationship mapping.
I already did some tests, but most of them with the same error.
Could someone gives me a clue?
Info.:
netbeans 5.5 beta 2, oracle 10g, sun java app server 9 pe, windows xp
The message is:
Local Exception Stack:
Exception [TOPLINK-4002] (Oracle TopLink Essentials - 2006.4 (Build 060412)): oracle.toplink.essentials.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: ORA-01400: não é possível inserir NULL em ("TEMP_GROUP"."GRUPO"."CD_PROJE")
Error Code: 1400
Call:INSERT INTO GRUPO (CD_GRUPO, DT_INCLU, CD_USUAR_ALTER, ST_ADMIN, DT_ALTER, DS_GRUPO, CD_USUAR_INCLU) VALUES (?, ?, ?, ?, ?, ?, ?)
bind => [411, null, null, null, null, grupoJPA_1, null]
Query:InsertObjectQuery(entity.Grupo[cdGrupo=411])
at oracle.toplink.essentials.exceptions.DatabaseException.sqlException(DatabaseException.java:295)
at oracle.toplink.essentials.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:639)
at oracle.toplink.essentials.internal.databaseaccess.DatabaseAccessor.executeNoSelect(DatabaseAccessor.java:688)
at oracle.toplink.essentials.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:477)
That's mainly about two tables: PROJETO (Project) and GRUPO (Group) -> 1 - N
One project may have many groups, but each group appears only once.
It will never be in two differents projects.
Tables:
PROJETO
- CD_PROJE (pk)
- DS_PROJE
GRUPO
- CD_GRUPO (pk)
- DS_GRUPO
- CD_PROJE (NOT NULL, it's not part of this GRUPO's pk)
- DT_INCLU
- CD_USUAR_ALTER
- ST_ADMIN
- DT_ALTER
- DS_GRUPO
- CD_USUAR_INCLU
Relevant code:
Projeto class
@Id
@Column(name = "CD_PROJE", nullable = false)
@SequenceGenerator(name="SqProjeto",sequenceName="SQ_PROJETO", allocationSize=20)
@GeneratedValue(strategy=javax.persistence.GenerationType.SEQUENCE, generator="SqProjeto")
private Long cdProje;
@OneToMany(cascade = CascadeType.ALL, mappedBy="cdProje")
private java.util.Collection <entity.Grupo> grupoCollection;
Grupo class
@Id
@Column(name = "CD_GRUPO", nullable = false)
@SequenceGenerator(name="SqGrupo",sequenceName="SQ_GRUPO", allocationSize=20)
@GeneratedValue(strategy=javax.persistence.GenerationType.SEQUENCE, generator="SqGrupo")
private Long cdGrupo;
@JoinColumn(name = "CD_PROJE",
referencedColumnName = "CD_PROJE",
nullable = false,
insertable = false,
updatable = false)
@ManyToOne
private Projeto cdProje;
My TestClass:
EntityManager em = emf.createEntityManager();
Projeto p = (Projeto)em.createNamedQuery("Projeto.findByCdProje").
setParameter("cdProje",365).
getSingleResult();
Grupo g = new Grupo();
g.setDsGrupo("grupoJPA_1");
g.setSubgrupoCollection(new ArrayList<Subgrupo>());
Subgrupo sb = new Subgrupo();
sb.setDsSubgr("subgrupoJPA_1_A");
g.getSubgrupoCollection().add(sb);
sb = new Subgrupo();
sb.setDsSubgr("subgrupoJPA_1_B");
g.getSubgrupoCollection().add(sb);
g.setCdProje(p.getCdProje());
em.persist(g); // g has cdProjeto = 365
utx.commit(); // error...
Sorry about the length of the post
Thanks a lot!
!_Let's share ideas_!

Answer 1

Perfect!
Thanks a lot!
In other cases I was getting the an error when mapping N-N relationship whithout setting the FKs to read-only on the jointables entitties. And that's why i assumed read-only when using joinColumn annotation. I was wrong :))
(Multiple writable mappings exist for the field)
once again, thanks!