Variable 1:1 mapping and interface????

Question

I am having a little trouble with mapping a variable 1:1 where the reference descriptor is an interface. Everything is fine in the work bench until I finally get stuck with Query Key Name(s) are no longer valid.
Basically I have an interface
ContactInterface, which is implemented by several classes
PhoneContact, EmailContact, etc. The common key is the customerID which exists in PhoneContact and EmailContact. Both of these classes are mapped correctly. In the upper class Customer I have a contact attribute that is mapped as a variable 1:1 it points to the reference descriptor ContactInterface, the class indicators info is correct, and the Query Key Association is mapped from CUSTOMERID to customerID (this is the common query key).
Any ideas on why this does not work or why I am getting
the error. Is there anything special I must to in my
interface or implementors to get this to work.
Thanks

Answer 1

It is in the TopLink Mapping Workbench UI and the exception or error is
"The following specified Query Key Name(s) are no longer valid: customerID" Unfortunately this message is not in the Trouble Shooting guide. I simplified my
example to only one implementor of the interface.
This is the interface:
//Note the methods are there only because I
//was trying to see if maybe the def for getter
//and setters were needed in the interface.
public interface ContactI
public String getContactInfo();
public void setContactInfo(String contactInfo);
public int getCustomerID();
public void setCustomerID(int customerID);
Implementation of ContactI (Interface):
public class EmailContact implements ContactI
String contactInfo = null;
int customerID=-1;
     public int getCustomerID()
          return customerID;
     public void setCustomerID(int customerID)
          this.customerID = customerID;
     public String getContactInfo()
          return contactInfo;
     public void setContactInfo(String contactInfo)
          this.contactInfo = contactInfo;
     public EmailContact()
          super();
The container class Customer:
public class Customer
int customerid = -1;
String lastName = null;
String firstName= null;
java.util.Date contactDate =null;
ContactI contact = null;
     public ContactI getContact()
          return contact;
     public void setContact(ContactI contact)
          this.contact = contact;
     public java.util.Date getContactDate()
          return contactDate;
     public void setContactDate(java.util.Date contactDate)
          this.contactDate = contactDate;
     public int getCustomerid()
          return customerid;
     public void setCustomerid(int customerid)
          this.customerid = customerid;
     public String getFirstName()
          return firstName;
     public void setFirstName(String firstName)
          this.firstName = firstName;
     public String getLastName()
          return lastName;
     public void setLastName(String lastName)
          this.lastName = lastName;
     public Customer()
          super();
tables are:
create table customer
customerid number primary key not null,
lastname varchar(32),
firstname varchar2(32),
contactClass varchar2(255)
create table contact
customerid number primary key not null,
contactInfo varchar2(45)
alter table contact add foreign key (customerid)references customer;
I tried this way also/ modified the class accordingly:
create table customer
customerid number primary key not null,
contactid number,
lastname varchar(32),
firstname varchar2(32),
contactClass varchar2(255)
create table contact
contactid number primary key not null,
contactInfo varchar2(45)
alter table customer foreign key (contactid)references contact;
In the mapping workbench I load ContactI, Customer and
EmailContact. On the ContactI in the Implementors tab I select EmailContact (Don't know what Common Query Keys
pain is for because I never see anything in it). Then
on the EmailContact I map EmailContact and the attributes to contact table. Then I map Customer to Customer table, on the contact attribute I map as a
variable one to one, then in the general tab for this
attribute I select Reference Descriptor ContactI, in the
class indicator info tab I select CONTACTCLASS as the
indicator field of type java.lang.String. I click on include so there is a check mark next to EmailContact and indicator value is CONTACT. I switch to query key association and click add and select CUSTOMERID as the foreign key and customerID as the Query Key Name, at
this point I get the above message. It is saying that
customerID in EmailContact is no longer a valid Key Name,
yet if I click over to EmailContact customerID is valid.
Unfortunately there is no example of doing this in the documentation and this error message is not listed in the trouble shooting guide.