Java 在复合键中使用JoinColumns时类型描述符错误

我一直在绞尽脑汁，试图找出以下映射的错误。我知道下面的映射不适合ORM，但数据库就是这样的，我不能改变它的结构。我正在使用JPA2.1和Hibernate5.0.2.Final

@MappedSuperclass    
public abstract class BaseEntity<T extends Serializable> implements Serializable {

    protected T id;

    @Id
    public T getId() {
        return id;
    }

    protected void setId(T id) {
        this.id = id;
    }
}

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除了这个结构之外，我还有一个转换器来处理LocalDate到

java.sql.Date

，它用

autoApply=true

注释

当我试图通过

entityManager.find（）

加载

CampaignBroadcastProcess

时，hibernate尝试将

campaign\u id

转换为日期，即使它映射为字符串，也会导致

java.sql.Date

引发

IllegalStateException

，因为传递给

valueOf

的字符串不是有效的日期字符串

我怀疑Hibernate混淆了

ActivityBroadcastProcessPK

上JoinColumns的类型，将它们都作为LocalDate处理

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有人曾经遇到过这个问题吗？

尝试在您的

@JoinColumn

中添加显式的referencedColumnName。您描述的错误可能是由于组合键列的隐式映射顺序错误造成的

@ManyToOne
@JoinColumns({
    @JoinColumn(name = "campaign_id", referencedColumnName = "campaign_id", ...),
    @JoinColumn(name = "broadcast_date", referencedColumnName = "broadcast_date", ...) })
private CampaignBroadcast broadcast;

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我不太清楚原因，但改变两个

@joincolm

的顺序解决了这个问题。现在的映射如下所示：

@ManyToOne
@JoinColumns({ 
    @JoinColumn(name = "broadcast_date", insertable = false, updatable = false),
    @JoinColumn(name = "campaign_id", insertable = false, updatable = false)     
})
private CampaignBroadcast broadcast;

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我认为这是因为hibernate选择了第一个数据类型，即数据类型，并将其映射到联接列

，这实际上就是我所说的-顺序错误的隐式映射。考虑使用显式绑定，而不是依赖于注释No.No的隐式命令，情况并非如此，因为即使引用了CyrnNeN名字，映射也不起作用。

@Entity
@Table(name = "campaign_broadcast")
public class CampaignBroadcast implements Serializable {

    @EmbeddedId
    private CampaignBroadcastPK id;

    // attributes, getters and setters
}

@Embeddable
public class CampaignBroadcastProcessPK implements Serializable {

   @ManyToOne
   @JoinColumns({ 
       @JoinColumn(name = "campaign_id", insertable = false, updatable = false),
       @JoinColumn(name = "broadcast_date", insertable = false, updatable = false) 
    })
    private CampaignBroadcast broadcast;

    @Column(name = "process_date)
    private LocalDate processDate;

    // getters and setters
}

@Entity
@Table(name = "campaign_broadcast_process")
public class CampaignBroadcastProcess implements Serializable {

    @EmbeddedId
    private CampaignBroadcastProcessPK id;

    // attributes, getters and setters
}

@ManyToOne
@JoinColumns({
    @JoinColumn(name = "campaign_id", referencedColumnName = "campaign_id", ...),
    @JoinColumn(name = "broadcast_date", referencedColumnName = "broadcast_date", ...) })
private CampaignBroadcast broadcast;

@ManyToOne
@JoinColumns({ 
    @JoinColumn(name = "broadcast_date", insertable = false, updatable = false),
    @JoinColumn(name = "campaign_id", insertable = false, updatable = false)     
})
private CampaignBroadcast broadcast;