http://code.google.com/appengine/docs/java/datastore/relationships.html#Dependent_Children_and_Cascading_Deletes
-------------------------
Dependent Children and Cascading Deletes
The App Engine implementation of JDO makes all owned relationships
"dependent." If a parent object is deleted, all child objects are also
deleted. Breaking an owned relationship by assigning a new value to
the dependent field on the parent also deletes the old child.
As with creating and updating objects, if you need every delete in a
cascading delete to occur in a single atomic action, you must perform
the delete in a transaction.
--------------------------
So your:
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class MobilePhone implements IsSerializable {
........
@Persistent(dependent = "false")
private User creator;
.....
is regarded as 'MobilePhone' being the owner of the 'User' what is you
don't expected.
If you want to keep 'non-owned' relationship between 'MobilePhone' and
'User' than the best way is simply keep the key of the User in
MobilePhone and to handle is manually.
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class MobilePhone implements IsSerializable {
........
@Persistent
private Key creator;
.....
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