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POHow to cascade persist using JPA/EclipseLink
 

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    <p>I am having problems performing a cascade persist operation on a parent entity. When the child entity is persisted, the reference (generated id) to the parent entity is null. How would I get this to persist correctly?</p> <p>Entities:</p> <pre><code>@Entity public class Contact { @Id @GeneratedValue(strategy=GenerationType.TABLE, generator="contact_gen") @TableGenerator(name="contact_gen", table="id_gen", pkColumnName="gen_name", valueColumnName="gen_val", pkColumnValue="cont_gen") @Column(name="contact_id") private Long id; @Column(name="name") private String name; @OneToMany(mappedBy="contact", cascade=CascadeType.PERSIST) private List&lt;Address&gt; addresses = new ArrayList&lt;Address&gt;(); public void addAddress(Address address) { addresses.add(address); } ... } @Entity public class Address { @Id @GeneratedValue(strategy=GenerationType.TABLE, generator="address_gen") @TableGenerator(name="address_gen", table="id_gen", pkColumnName="gen_name", valueColumnName="gen_val", pkColumnValue="addr_gen") @Column(name="address_id") private Long id; @Column(name="full_address") private String fullAddress; @ManyToOne @JoinColumn(name="contact_id") private Contact contact; ... } </code></pre> <p>Service:</p> <pre><code>@Stateless public class ContactService { @PersistenceContext private EntityManager em; public void createContact() { Contact contact = new Contact(); contact.setName("Michael Scott"); contact.addAddress(new Address("1725 Slough Avenue"); em.persist(contact); } } </code></pre> <p>MySQL Tables &amp; Inserts:</p> <pre><code>CREATE TABLE `contact` ( `contact_id` int(11) NOT NULL, `name` varchar(45) NOT NULL PRIMARY KEY (`contact_id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; CREATE TABLE `address` ( `address_id` int(11) NOT NULL, `full_address` varchar(100) NOT NULL, `contact_id` int(11) NOT NULL, PRIMARY KEY (`address_id`), KEY `FK_ADDRESS_contact_id` (`contact_id`), CONSTRAINT `FK_ADDRESS_contact_id` FOREIGN KEY (`contact_id`) REFERENCES `contact` (`contact_id`) ON DELETE NO ACTION ON UPDATE NO ACTION ) ENGINE=InnoDB DEFAULT CHARSET=latin1; CREATE TABLE id_gen ( gen_name VARCHAR(80), gen_val INT, PRIMARY KEY (gen_name) ); INSERT INTO id_gen (gen_name, gen_val) VALUES ('cont_gen', 0); INSERT INTO id_gen (gen_name, gen_val) VALUES ('addr_gen', 0); </code></pre>
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