Hello:
It seems like a simple problem, but I can't get it to work. I have two
entites, related by a OneToMany relationship:
| @Entity
| public class WidgetHolder {
|
| @Id (generate=GeneratorType.IDENTITY)
| private long id;
|
|
| @OneToMany(mappedBy="myWidgetHolder", cascade=CascadeType.ALL)
| private List<Widget> myWidgets = new ArrayList<Widgets>();
|
|
| public void addWidget(Widget aWidget) {
| myWidgets.add(aWidget);
| }
| }
|
|
| @Entity
| public class Widget {
|
| ...
|
| @ManyToOne(optional=false)
| @JoinColumn(name="WIDGET_HOLDER_ID", nullable=false, updatable=false)
| private WidgetHolder myWidgetHolder;
|
|
| public Widget(WidgetHolder aHolder) {
| myWidgetHolder = aHolder;
| }
|
|
| ...
|
| }
|
When I do the following in a SLSB:
| public class StatelessBean {
|
| @PersistenceContext (unitName="widgetContext")
| protected EntityManager em;
|
| public void createWidgetHolder() {
|
| WidgetHolder widgetHolder = new WidgetHolder();
|
| List<Widget> widgets = new ArrayList<Widget>();
| widgetHolder.addWidget(new Widget(widgetHolder))
| widgetHolder.addWidget(new Widget(widgetHolder));
|
| ...
|
| em.persist(widgetHolder);
| }
| }
|
I get the following error:
java.lang.RuntimeException: org.jboss.tm.JBossRollbackException: Unable to
commit, tx=TransactionImpl:XidImpl[FormatId=257, GlobalId=VELOCITY1/39,
BranchQual=, localId=39] status=STATUS_NO_TRANSACTION; - nested throwable:
(org.hibernate.PropertyValueException: not-null property references a null or
transient value: Widget.myWidgetHolder)
When I take out the "optional=false" and "nullable=false" on the ManyToOne
relationship, the INSERT statement for Widget tries to insert a NULL in the
WIDGET_HOLDER_ID column. (I use MSSQL 2000 as the datastore).
Is there some sort of annotation I need to explicitly tell Hibernate to get the
newly-created ID from WidgetStore and use it in the INSERT of Widget? Any help
would be appreciated - thanks!!
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