Problem in mapping 1:M relationship

Question

I am using toplink+jpa in my application.
I have a 1:M unidirectional relationship (without association table) in my application.
I am not able to find correct annotations to define it.
Kindly help.
Following code works when I use JPA+Hibernate but doesnot work for JPA+Toplink:
@Entity
@IdClass(PersonPK.class)
public class Person {
/* to store the age*/
private int age;
/* to store the firstName*/
@Id
@Column(name="fname")
private String firstName;
/* to store the lastName*/
@Id
@Column(name="lname")
private String lastName;
/* to store the addressList*/
@OneToMany(cascade = CascadeType.ALL)
@JoinColumns({
@JoinColumn(name="_fname", referencedColumnName="fname"),
@JoinColumn(name="_lname", referencedColumnName="lname")
private List<Address> addressList;
public PersonPK getPersonPK() {
return new PersonPK(this.firstName, this.lastName);
public void setPersonPK(PersonPK personPK) {
this.setFirstName(personPK.getFirstName());
this.setLastName(personPK.getLastName());
/* @return Returns the age */
public int getAge() {
return age;
/* @param the age to set */
public void setAge(int age) {
this.age = age;
/* @return Returns the firstName */
public String getFirstName() {
return firstName;
/* @param the firstName to set */
public void setFirstName(String firstName) {
this.firstName = firstName;
/* @return Returns the lastName */
public String getLastName() {
return lastName;
/* @param the lastName to set */
public void setLastName(String lastName) {
this.lastName = lastName;
/* @return Returns the addressList */
public List getAddressList() {
return addressList;
/* @param the addressList to set */
public void setAddressList(List addressList) {
this.addressList = addressList;
Thanks

Answer 1

The JPA 1.0 spec explicitly states that doing this kind of thing is not portable, and in general is not a good object model design to match the relational schema.
It is recommended that if a foreign key to another table exists in an entity row that there be a relationship from the entity to the corresponding entity of the target table, or that a join table be used.