[appengine-java] JPA em.persist() saving old copies of nested Entity class

[Kesava Neeli]

Hi,

I have a question on nested Entity class using JPA framework on appengine. I 
have code liek this..

@Entity
public class MyDataObject {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    Key key;
    
// some persistent fields of standatd types    

    @Basic
    
@OneToOne(cascade={CascadeType.PERSIST,CascadeType.REFRESH,CascadeType.REMOVE})
    List<SmartItem>data;

// standard getters/setters
}

One of the fields above is "data" which is a collection of a another Entity 
class SmartItem.  
@Entity
public class SmartItem implements java.io.Serializable{
    private static final long serialVersionUID = 4428700412206745337L;
    
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    Key key;
    public Key getKey() {
        return key;
    }
//bunch of persistent fields
}

            Key key = 
KeyFactory.createKey(MyDataObject.class.getSimpleName(), newData.deviceId); 
            newData.key = key;
            em.persist(newData);
            //em.merge(newData);

When I call em.persist for first time, the data is saved correctly. I see a 
list of my "SmartItem" objects in the datastore. When I call em.persist 
again for the same entiry MyDataObject, the SmartItems are "appended" and 
not "replaced". Ex: First item I have my <List> data as "list1", "list2". 
Next I add "list3" to my list and call em.persist(..). Now I see "list1", 
"list2", "list1", "list2", "list3" items.  Tried em.merge and still same 
behavior. 

Anyone has suggestions? When I call em.persist(), I would like my nested 
Entity field item List<SmartItem> data to just contain the new list and not 
the old entities.. 

Thanks
Neeli 


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