Hello!
I get this exception:
java.lang.ClassCastException: oid is not instanceof
javax.jdo.identity.StringIdentity
at .....DbContact.jdoCopyKeyFieldsFromObjectId(DbContact.java)
......
when i try to do the following:
customer = new DbCustomer();
contact = new DbContact();
..... set properties of contact....
customer.setProfile(contact);
.... set other properties of customer
Transaction tx = pm.currentTransaction();
try {
tx.begin();
pm.makePersistent(customer);
tx.commit();
}
finally {
if (tx.isActive()) {
tx.rollback();
}
My classes look like this:
public class DbCustomer {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
@Extension(vendorName="datanucleus", key="gae.encoded-pk",
value="true")
private String encodedKey;
@Persistent
private DbContact profile;
@Persistent(mappedBy = "customer")
private List<DbContact> privateContacts;
@Persistent(mappedBy = "customer")
private List<DbUserProfile> users;
.....
}
public class DbContact {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
@Extension(vendorName="datanucleus", key="gae.encoded-pk",
value="true")
private String encodedKey;
@Persistent
private DbCustomer customer;
.....
}
Any ideas what this exception means and why it occurs?
I think it might have something to do with the fact that i'm using
String encoded key instead of Key,
but i'm not sure... and should this be a problem?
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