From: Greg Ederer <greg_at_ergonosis.com>
Date: Sat, 06 Jan 2007 23:00:02 -0800

Hi,

I have an entity called Person that has a list of Address entities. In
Person, I have:

  @OneToMany(cascade=CascadeType.ALL, mappedBy="person")
  private List<Address> addresses = new ArrayList<Address>();
 
  public void addAddress(Address address)
  {
    if(this.getAddresses().contains(address))
    {
      return;
    }
   
    getAddresses().add(address);
    address.setPerson(this);
  }

In Address, I have:

  @ManyToOne
  @JoinColumn(name="person", nullable = false)
  private Person person;

In another class, I modify a Person instance, and also modify its owned
Address instances, and then merge the Person instance. Afterward, the
changes to the Person instance are reflected in the database, as
expected; however, changes to the Address instances do not appear in the
database.

I get a reference to each Address via EntitManager.find(), like so:

  EntityManager em = getEntityManager();
  Object o = em.find(javaType, id);
  em.close();

(where javaType is a Person Class instance) rather than retrieving from
the Person object graph. Does this matter?

I then merge the Person by calling the following method:

  private Object saveObject(Object o)
  {
    EntityManager em = getEntityManager();
    try
    {
      utx.begin();
      if(PropertyUtils.getProperty(o, "id") == null)
      {
        em.persist(o);
      }
      else
      {
        o = em.merge(o);
      }
      utx.commit();
    }
    catch (Exception ex)
    {
      //logger.severe("save failed.");
      ex.printStackTrace();
     
      try
      {
        utx.rollback();
      }
      catch (Exception e)
      {
        //logger.severe("rollback falied.");
        e.printStackTrace();
      }
    }
    finally
    {
      em.close();
    }
   
    return o;
  }
 
My Person instance does have an id, so em.merge(o) should get executed.
Also, utx is a UserTransaction obtained via @Resource.

Can anyone tell me how to get this working?

Thanks!

Greg

-- 
| E R G O N O S I S
| Greg Ederer
| Lead Developer
| greg_at_ergonosis.com
| 360.774.6848
|