hibernate - JPA 2.0/hibernate : No supertype found

Question

当我尝试查询使用 Hibernate 映射的实体时，JSF Web 应用程序抛出异常(见下文)。我究竟做错了什么？或者这是 Hibernate 中的一个错误？我该如何解决这个问题？感谢您的帮助:)

以下是相关类:

基类ShipmentUnit有一些子类:

@Entity
@Table(name = "tat_shipment_unit")
@Inheritance(strategy = SINGLE_TABLE)
@DiscriminatorColumn(name = "unit_type", discriminatorType = CHAR, length = 1)
@DiscriminatorValue("_")
public abstract class ShipmentUnit implements Serializable {
    private Long id;
    private List<ShipmentAction> actions;

    @Id @GeneratedValue
    public Long getId() { return id; }  // and corresponding setter

    @OneToMany(mappedBy = "unit")
    @OrderBy("listIndex")
    public List<ShipmentAction> getActions() { return actions; }  // and setter

    // hashCode, equals etc.
}

ShipmentAction 类:

@Entity
@Table(name = "tat_shipment_action")
@IdClass(ShipmentActionID.class)
public class ShipmentAction implements Serializable {
    private ShipmentUnit unit;
    private int listIndex;

    @Id @ManyToOne @NotNull
    public ShipmentUnit getUnit() { return unit; }  // and setter

    @Id @Column(name = "list_index", nullable = false)
    public int getListIndex() { return listIndex; } // and setter
}

ShipmentActionID类还有unit和listIndex getter 和 setter 方法上具有相同签名的属性。

现在，我想显示 h:dataTable与 LazyDataModel<ShipmentAction> 。数据模型的实现使用 Criteria API 来 (1) 计数和 (2) 查询这些发货操作实体，如下所示:

CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<Number> query = cb.createQuery(Number.class);
Root<ShipmentAction> root = query.from(ShipmentAction.class);
Predicate predicates = ...
int total = em.createQuery(
    query.select(cb.count(root).where(predicates)
).getSingleResult().intValue();

目前TypedQuery应使用 em.createQuery(...) 创建抛出异常:

[SEVERE] Error Rendering View[/tat/report/actions.xhtml]: java.lang.IllegalStateException: No supertype found
at org.hibernate.ejb.metamodel.AbstractIdentifiableType.requireSupertype(AbstractIdentifiableType.java:85)
at org.hibernate.ejb.metamodel.AbstractIdentifiableType.getIdType(AbstractIdentifiableType.java:173)
at org.hibernate.ejb.criteria.expression.function.AggregationFunction$COUNT.renderArguments(AggregationFunction.java:110)
at org.hibernate.ejb.criteria.expression.function.ParameterizedFunctionExpression.render(ParameterizedFunctionExpression.java:94)
at org.hibernate.ejb.criteria.expression.function.BasicFunctionExpression.renderProjection(BasicFunctionExpression.java:71)
at org.hibernate.ejb.criteria.QueryStructure.render(QueryStructure.java:250)
at org.hibernate.ejb.criteria.CriteriaQueryImpl.render(CriteriaQueryImpl.java:338)
at org.hibernate.ejb.criteria.CriteriaQueryCompiler.compile(CriteriaQueryCompiler.java:223)
at org.hibernate.ejb.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:619)

我正在使用 Hibernate 版本 4.0.0.Final，在 JBoss AS 7 上运行。

        <dependency>
        <groupId>org.hibernate.javax.persistence</groupId>
        <artifactId>hibernate-jpa-2.0-api</artifactId>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.jboss.spec.javax.ejb</groupId>
        <artifactId>jboss-ejb-api_3.1_spec</artifactId>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.jboss.spec.javax.annotation</groupId>
        <artifactId>jboss-annotations-api_1.1_spec</artifactId>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.enterprise</groupId>
        <artifactId>cdi-api</artifactId>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.validation</groupId>
        <artifactId>validation-api</artifactId>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>4.0.0.Final</version>
        <scope>provided</scope>
    </dependency>

Answer 1

我找到了解决问题的方法。我更改了依赖类ShipmentAction的映射通过使用 @EmbeddedId而不是两个@Id注释。如果您感兴趣，这里是更新后的类(ShipmentUnit 类的映射未更改¹)

@Entity
@Table(name = "tat_shipment_action")
public class ShipmentAction implements Serializable {
    private @EmbeddedId Key id;
    private @MapsId("unit_id") @ManyToOne ShipmentUnit unit;

    public ShipmentAction() {
        id = new Key();
    }

    public ShipmentUnit getUnit() { return unit; }  // and setter

    public int getListIndex() {
        return id.list_index;
    }

    public void setListIndex(int index) {
        id.list_index = index;
    }

    @Embeddable
    public static class Key implements Serializable {
        public long unit_id;
        public int list_index;
        // hashCode() and equals()
    }
}

好吧，这似乎有效，我的 LazyDataModel<ShipmentAction>现在喜欢它:-)
但唯一奇怪的是，这只适用于字段上的 JPA 注释，Hibernate 无法再处理 getter 方法上的这些注释(至少在受我的更改影响的类上)。对此有什么想法吗？

¹ 另一个小变化:@javax.persistence.OrderBy注释位于ShipmentUnit.getActions()必须替换为 @org.hibernate.annotations.OrderBy无论出于何种原因。