Question

I use Hibernate on JBoss AS 7.1 and have problems when i create new entities and set an existing entity to a ManyToOne relation. The exising entity (customer) is queried before using the following code:

TypedQuery<Customer> query = em.createNamedQuery("Customer.findByLastNameLike", Customer.class);
query.setParameter("lastName", "%"+lastName+"%");
return query.getResultList();

When i execute an em.persist(order) on the new entity order after setting customer to order with order.setCustomer(customer) the following exception is thrown:

Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: erp.model.persons.Customer
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:141)
    at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:717)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:710)
    at org.hibernate.engine.spi.EJB3CascadingAction$1.cascade(EJB3CascadingAction.java:49)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:380)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:323)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:208)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:165)
    at org.hibernate.event.internal.AbstractSaveEventListener.cascadeBeforeSave(AbstractSaveEventListener.java:437)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:266)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:195)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:138)
    at org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:78)
    at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:208)
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:151)
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:78)
    at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:725)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:701)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:705)
    at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:853)

The entities are defined as follows:

@Entity
public class Order extends AbstractEntity implements Serializable {

    private static final long serialVersionUID = -8061887078955032972L;

    @ManyToOne(cascade={CascadeType.MERGE, CascadeType.REFRESH, CascadeType.PERSIST}, optional = false)
    private Customer customer = null;

@Entity
@DiscriminatorValue("customer")
public class Customer extends Person implements Serializable {

    private static final long serialVersionUID = 2788107135840578322L;

    @OneToMany(cascade=CascadeType.ALL, mappedBy="customer")
    private List<Order> orders = null;

What is wrong in this scenario?

Thanks for any hint…

Answer 1

the following answers answer my question as well. i changed from using em.persist() to em.merge() even for new entities. And now my whole object graph is persisted sucessfully, whether there are new entities mixed in or not.

JPA cascade persist and references to detached entities throws PersistentObjectException. Why?

And furthermore i removed CascadeType.PERSIST