Hi Detlef,
I guess the easiest way to handle this is to restore default Java
serialization behavior, overriding CayenneDataObject context based
deserialization. E.g. you may use the following class as a customer
superclass of all your entity classes:
public class SerializableDO extends CayenneDataObject {
private void writeObject(ObjectOutputStream out) throws IOException {
out.writeObject(values);
out.writeObject(objectId);
}
private void readObject(ObjectInputStream in) throws IOException,
ClassNotFoundException {
this.values = (Map) in.readObject();
this.objectId = (ObjectId) in.readObject();
this.persistenceState = PersistenceState.TRANSIENT;
}
}
Andrus
On Nov 22, 2007, at 11:49 AM, Detlef Burt wrote:
Hello List,
as you might expect, i got a small problem.
The scenario is the following:
I have a framework that communicates completely via OpenJMS. It has
a "PersistenceLayer" that can be configured to use different
PersistenceFrameworks. One of these is Cayenne.
The Program flow is the following:
1. Send a request to the server (in my Testcase: "get Extents of
Class X from Database")
2. The PersistenceLayer handles the request and returns the correct
results from the Database in a Vector --> Up to this point,
everything is fine
3. Send the Vector back to the Application that requested the Data.
Now this is where my Problem is:
I get a Vector with the right amount of Entries and they all have
the right class, but all the Objects are hollow and return null for
every property/class field.
I found out, that I can keep the Objects contents when I call
DataContext.unregisterObjects, but after reading some more posts on
this group, I do remember reading something about unregisterObjects
not being a good solution. Quoting Andrus:
"In any event I would advise against using "unregisterObjects",
unless you are sure there are no remaining cached objects that point
to unregistered objects via a relationship."
So my question is:
Is there a more elegant solution to my problem? I really would like
to keep all the Data from the Objects and maybe even the ObjectId of
the Objects to be able to more easily reference the Objects in the
Database.
Thanks in Advance,
Detlef
