Databases
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POHibernate sets ID to null
 

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    <p>I have a problem where Hibernate resets the IDs for entities even though I explicitly set them.</p> <p>Here are my two entities:</p> <pre><code>@Entity @Table(name="game") public class Game implements Serializable { private String token; private Set&lt;DealersCard&gt; dealersCards; @Id @Size(min=36, max=36) @Column(name="token") public String getToken() { return token; } public void setToken(String token) { this.token = token; } @OneToMany(fetch=FetchType.EAGER, cascade={CascadeType.ALL}) public Set&lt;DealersCard&gt; getDealersCards() { return dealersCards; } public void setDealersCards(Set&lt;DealersCard&gt; dealersCards) { this.dealersCards = dealersCards; } } </code></pre> <p>and </p> <pre><code>@Entity @Table(name="dealers_card") public class DealersCard implements Serializable { private String token; private int id; public void setVisible(boolean visible) { this.visible = visible; } @ManyToOne @MapsId("token") @JoinColumn(name="token", referencedColumnName="token") public Game getGame() { return game; } public void setGame(Game game) { this.game = game; } @Id @Size(min = 36, max = 36) public String getToken() { return token; } public void setToken(String token) { this.token = token; } @Id public int getId() { return id; } public void setId(int id) { this.id = id; } } </code></pre> <p>When I create an instance of Game with a two DealersCard assigned through EntityManager::persist the objects are created in the database correctly and I can retrieve them later, but if I retrieve an instance of Game, add another instance of DealersCard and try to update the database with EntityManager::merge, Hibernate, for some reason, sets the token field to null and id to 0 and I get </p> <blockquote> <p>javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: ERROR: null value in column "token" violates not-null constraint Detail: Failing row contains (null, 0).</p> </blockquote> <p>I tried MySQL and PostgreSQL but I still encounter the same error. I am running Glassfish 3.1.2.2, Hibernate Entity Manager 4.1.2, Java EE 6.</p> <p>Any help is appreciated.</p> <p>Thanks!</p>
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