Persist problem in cascade using @OneToMany

Question

We are trying to persist an object which has a OneToMany relationship to other objects with CascadeType.ALL
When we persist, the log shows that it creates the INSERT statement with the correct bind variables (sequence-generated REPORT_ID, etc.) for the first object.
The problem happens when it tries to cascade and insert the Many part. The log shows the it tries to create the INSERT statement for the second object but the bind variable for the REPORT_ID is null.
Since we defined the relationship of the OneToMany using the REPORT_ID, we assumed that the REPORT_ID that was auto-generated for the first object would be used for the @Many objects.
What are we missing ??????
First Object:
@Id
@SequenceGenerator(name = "REPORT_HEADER_S", initialValue = 1, allocationSize = 1)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "REPORT_HEADER_S")
@Column(name = "REPORT_ID", nullable = false)
private Long reportId;
@OneToMany(mappedBy = "report", cascade = { CascadeType.ALL})
private List<Summary> summaryList;
Second Object
@ManyToOne
@JoinColumn(name = "REPORT_ID", referencedColumnName = "REPORT_ID")
private Report report;

Answer 1

Hello, Chris.
Thank you for your reply.
The structure of my tables is:
table document (id int not null constraint document_pk primary key,
table document_price (document_id int not null constraint document_price_fk references document (id),
date date not null default current_date,
price decimal(9,2) not null,
primary key (document_id, date)).
The entity classes are:
@Entity @Table(name = "DOCUMENT")
public class Document implements Serializable {
@TableGenerator(name = "document_generator", table = "ID_GENERATION", pkColumnName = "TABLE_NAME", valueColumnName = "ID_VALUE",
pkColumnValue = "DOCUMENT", allocationSize = 1)
@Id
@GeneratedValue(generator = "document_generator")
@Basic(optional = false)
@Column(name = "ID")
private Integer id;
// other fields
@OneToMany(cascade = CascadeType.ALL, mappedBy = "document", fetch = FetchType.LAZY)
private Collection<DocumentPrice> documentPriceCollection;
// constructors, getters, setters ...
@PostPersist
public void initializePrices() {
for (DocumentPrice dp : documentPriceCollection) {
dp.documentPricePK.setDocumentId(id);
@Entity
@Table(name = "DOCUMENT_PRICE")
public class DocumentPrice implements Serializable {
@EmbeddedId
protected DocumentPricePK documentPricePK;
@Basic(optional = false)
@Column(name = "PRICE")
private BigDecimal price;
@JoinColumn(name = "DOCUMENT_ID", referencedColumnName = "ID", insertable = false, updatable = false)
@ManyToOne(optional = false, fetch = FetchType.LAZY)
private Document document;
// constructors, getters, setters ...
@Embeddable
public class DocumentPricePK implements Serializable {
@Basic(optional = false)
@Column(name = "DOCUMENT_ID")
private int documentId;
@Basic(optional = false)
@Column(name = "DATE")
@Temporal(TemporalType.DATE)
private Date date;
// constructors, getters, setters ...
I create first Document entity, create DocumentPrice entity and add DocumentPrice entity to the documentPriceCollection of the first Document entity. I invoke commit method of my entity manager, and corresponding rows are added to the document and document_price tables.
I invoke clear method of my entity manager.
Then I create new entities Document and DocumentPrice and add new DocumentPrice entity to the documentPriceCollection of the new Document entity. I invoke commit method and get the following exception:
oracle.toplink.essentials.exceptions.ValidationException
Exception Description: Cannot persist detached object [entities.DocumentPrice[documentPricePK=.entities.DocumentPricePK[documentId=0;
date=Sat May 29 00:00:00 MSD 2010];
price=11]].
Class> entities.DocumentPrice Primary Key> [2010-05-29, 0]
at oracle.toplink.essentials.exceptions.ValidationException.cannotPersistExistingObject(ValidationException.java:2171)
at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.registerNotRegisteredNewObjectForPersist(UnitOfWorkImpl.java:3251)
at oracle.toplink.essentials.internal.ejb.cmp3.base.RepeatableWriteUnitOfWork.registerNotRegisteredNewObjectForPersist(RepeatableWriteUnitOfWork.java:339)
at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.registerNewObjectForPersist(UnitOfWorkImpl.java:3220)
at oracle.toplink.essentials.mappings.CollectionMapping.cascadeRegisterNewIfRequired(CollectionMapping.java:265)
at oracle.toplink.essentials.internal.descriptors.ObjectBuilder.cascadeRegisterNewForCreate(ObjectBuilder.java:1294)
at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.registerNewObjectForPersist(UnitOfWorkImpl.java:3226)
at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerImpl.persist(EntityManagerImpl.java:205)
And I see through debugging that @PostPersist method of the Document entity isn't invoked during second commit before the exception is generated.
What should I do to avoid exception during second commit?