Question

I have build my data model using JPA and am using Hibernate’s EntityManager 3 to access the data. I used HSQLDB for testing (junit). I am using this configuration for other classes and have had no problems.

However, the latest batch of tables use a composite-key as the primary-key and I am not able to retrieve the populated row from the database when it is implemented. I don’t get an error, the query simply returns null objects.

For example if I query (using jsql) “FROM Order o” to return a list of all orders in the table, my list.size() has the proper number of elements (2), but the elements are null.

I am hoping that someone with a sharper eye than I can discern what I am doing wrong. Thanks in advance!

The (simplified) tables are defined as:

CREATE TABLE member (
    member_id INTEGER NOT NULL IDENTITY PRIMARY KEY);

CREATE TABLE orders (
    orders_id INTEGER NOT NULL,
    member_id INTEGER NOT NULL,
    PRIMARY KEY(orders_id, member_id));

ALTER TABLE orders 
    ADD CONSTRAINT fk_orders_member 
    FOREIGN KEY (member_id) REFERENCES member(member_id);

The entity POJOs are defined by:

@Entity
public class Member extends Person implements Model<Integer>{
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="MEMBER_ID", nullable=false)
    private Integer memberId;

    @OneToMany(fetch=FetchType.LAZY, mappedBy="member", cascade=CascadeType.ALL)
    private Set<Order> orderList;
}

@Entity
@Table(name="ORDERS")
@IdClass(OrderPK.class)
public class Order extends GeneralTableInformation implements Model<Integer>{

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="ORDERS_ID", nullable=false)
    private Integer orderId;

    @Id
    @Column(name="MEMBER_ID", nullable=false)
    private Integer memberId;

    @ManyToOne(optional=false, fetch=FetchType.LAZY)
    @JoinColumn(name="MEMBER_ID", nullable=false)
    private Member member;

    @OneToMany(mappedBy="order", fetch=FetchType.LAZY)
    private Set<Note> noteList;
}

OrderPK defines a default constructor and 2 properties (orderId, memberId) along with their get/set methods.

public class OrderPK implements Serializable {
private static final long serialVersionUID = 1L;

private Integer orderId;
private Integer memberId;

public OrderPK() {}

public OrderPK(Integer orderId, Integer memberId) {
    this.orderId = orderId;
    this.memberId = memberId;
}

/**Getters/Setters**/

@Override
public int hashCode() {
    return orderId.hashCode() + memberId.hashCode(); 
}

@Override
public boolean equals(Object obj) {
    if (this == obj) return true;
    if (obj == null) return false;
    if (!(obj instanceof OrderPK))
        return false;

    OrderPK other = (OrderPK) obj;
    if (memberId == null) {
        if (other.memberId != null) return false;
    } else if (!memberId.equals(other.memberId))
        return false;
    if (orderId == null) {
        if (other.orderId != null) return false;
    } else if (!orderId.equals(other.orderId))
        return false;
    return true;
}   

}

(sorry for the length)

the entityManager is instantiated in an abstract class which is then extended by my other DAOs

protected EntityManager em;

@PersistenceContext
public void setEntityManager(EntityManager em) {
    this.em = em;
}

and is configured by a spring context configuration file

<bean id="entityManagerFactory" 
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
    p:dataSource-ref="dataSource" 
    p:jpaVendorAdapter-ref="jpaAdapter">
    <property name="loadTimeWeaver">
        <bean class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver" />
    </property>
    <property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml" />
</bean>

My test class

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
public class OrderDaoTest {

    @Autowired
    protected OrderDao dao = null;

    @Test
    public void findAllOrdersTest() {
    List<Order> ol = dao.findAll();
    assertNotNull(ol); //pass
        assertEquals(2, ol.size(); //pass
        for (Order o : ol) {
            assertNotNull(o); //fail
            ...
        } 
    }
}

When I strip away the composite-key from the Order class I am able to retrieve data, I am not sure what I am doing incorrectly with my mapping or configuration. Any help is greatly appreciated.

Answer 1

After struggling with this problem for awhile longer I learned that I was configuring my Id properties in the wrong class.

Originally I was configuring orderId and memberId in the Order class

@Entity
@Table(name="ORDERS")
@IdClass(OrderPK.class)
public class Order extends GeneralTableInformation implements Model<Integer>{

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="ORDERS_ID", nullable=false)
    private Integer orderId;

    @Id
    @Column(name="MEMBER_ID", nullable=false)
    private Integer memberId;

However, I learned that if you are using an IdClass OR EmbeddedId that you must make the appropriate field annotations for your Id columns in the ID Class.

@Entity
@Table(name="ORDERS")

@IdClass(OrderPK.class)
public class Order extends GeneralTableInformation implements Model<Integer>{

    @Id
    private Integer orderId;

    @Id
    private Integer memberId;
}

public class OrderPK implements Serializable {
    private static final long serialVersionUID = 1L;

    @Column(name="ORDERS_ID", nullable=false)
    private Integer orderId;

    @Column(name="MEMBER_ID", nullable=false)
    private Integer memberId;
}

With this change I was able to return the expected results with my test.