Problem in Mapping

[Anupam Dee]

I have a Customer Class and an Address class as follows

Customer.java

public class Customer {

	private long customerId;
	private String name;
	private Address address;
//getters and setters
}

Address.java

public class Address {

	private long address_id;
	private String street;
        private Customer customer;
//getters and setters
}

Now I want to have two customers with the same address
e.g

Customer c1=new Customer();
Customer c2=new Customer();

Address a= new Address();
a.setStreet("ABCStreet");

c1.setAddress(a);
c2.setAddress(b);

session.save(c1);
session.save(c2);
tx.commit();

//Now when i try to retrieve the Customer Object and iterate over the list i am not getting the address for the second customer. I am getting null there.

These are my HBM files

Address.hbm.xml
<hibernate-mapping> <class name="hello.Address" table="ADDRESS"> <id name="address_id" type="long" access="field"> <column name="ADDRESS_ID" /> <generator class="assigned"/> </id> <property name="street" type="java.lang.String"> <column name="STREET" /> </property> <one-to-one name="customer" class="hello.Customer" constrained="true"></one-to-one> </class> </hibernate-mapping>

Customer.hbm.xml
<hibernate-mapping> <class name="hello.Customer" table="CUSTOMER"> <id name="customerId" type="long"> <column name="CUSTOMERID" /> <generator class="native" /> </id> <property name="name" type="java.lang.String"> <column name="NAME" /> </property> <one-to-one name="address" class="hello.Address" cascade="all" ></one-to-one> </class> </hibernate-mapping>


I am new to hibernate mapping.. please help me...

And i am a bit confused about the mapping strategies in hibernate..please suggest a good link too.

[Bill Gorder]

The way you have your objects defined you are expecting to a customer to have one address and that address to belong to exactly one Customer. But the way you are attempting to use it you are saying that one address can have many customers. With the way you have it defined you must define 2 Addresses with their own unique persistent ids even if they are both "ABCStreet"