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POJPA problem one-to-one association cascade= PERSIST
 

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    <p>I have this ER model</p> <pre><code> Message 0..1 &lt;--&gt; 0..1 MessageDetail PK:ID_MESSAGE PK: ID_DETAIL NAME DETAIL FK: ID_MESSAGE </code></pre> <p>And the relative Object mapping is:</p> <pre><code>class OnlineEventMessage { @Id @Column(name = "ID_EVENT_MESSAGE") @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "SEQ") private Long idEventMessage; @OneToOne(mappedBy="onlineEventMessage", cascade=CascadeType.PERSIST) private EventMessageAnagrafica eventMessageAnagrafica; } public class EventMessageAnagrafica { @Id @Column(name = "ID_EVENT_MESSAGE_ANAG") @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "SEQ") private Long idEventMessageAnagrafica; @OneToOne(cascade=CascadeType.PERSIST) @JoinColumn(name = "FK_ID_EVENT_MESSAGE") private OnlineEventMessage&lt;?&gt; onlineEventMessage; } </code></pre> <p>This test shows how I would like to handle the objects:</p> <pre><code>@Test public void testSaveItem() { EntityManager entityManager = factoryCont0.createEntityManager(); entityManager.getTransaction().begin(); OnlineEventMessage&lt;String&gt; eventMessage = new OnlineEventMessage&lt;String&gt;(EventType.ONLINE_REIMPIANTO_CONTRATTO); EventMessageAnagrafica eventMessageAnagrafica = new EventMessageAnagrafica(multichannelId); eventMessage.setEventMessageAnagrafica(eventMessageAnagrafica); entityManager.persist(eventMessage); entityManager.getTransaction().commit(); entityManager.close(); } </code></pre> <p>When I persist the eventMessage on the eventMessageAnagrafica it does not save the FK. The two ways to save the underlaying association are:</p> <p>1) add this line of code : <code>eventMessageAnagrafica.setOnlineEventMessage(eventMessage);</code> and save the child object: <code>entityManager.persist(eventMessageAnagrafica);</code></p> <p>2) change the parent setter as below:</p> <pre><code>public void setEventMessageAnagrafica(EventMessageAnagrafica eventMessageAnagrafica) { this.eventMessageAnagrafica = eventMessageAnagrafica; if (eventMessageAnagrafica != null) { eventMessageAnagrafica.setOnlineEventMessage(this); } } </code></pre> <p>Is there any other clean way to accomplish this? P.S. Initially the FK was on the parent table Message, but the DBA told me that this wasn't a good ER design.</p> <p>Kind regards Massimo</p>
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