Question

我正在尝试将Thorntail应用程序从Java 8迁移到Java 11，但是实体之间的关系存在问题。使用的映射在Java 8上工作正常，但在Java 11中我出现此错误：

2019-07-03 15:48:12,713 ERROR [stderr] (main) Exception Description: 
  Predeployment of PersistenceUnit [p-unit] failed.

2019-07-03 15:48:12,713 ERROR [stderr] (main) Internal Exception: 
  Exception [EclipseLink-7250] (Eclipse Persistence Services - 
   2.7.3.v20180807-4be1041): 
    org.eclipse.persistence.exceptions.ValidationException

2019-07-03 15:48:12,713 ERROR [stderr] (main) Exception Description: 
  [class com.mytest.data.specific.entities.Table3] uses a non-entity 
   [class com.mytest.data.specific.entities.Table2] as target entity 
     in the relationship attribute [field table2].

我的实体映射如下：

@MappedSuperclass
public abstract class AbstractIdEntity extends AbstractEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private Long id;

    public Long getId() {
        return id;
    }

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

@Entity
@Table(name = "table_2")
public class Table2 extends AbstractIdEntity {

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "table_1_id", referencedColumnName = "id")
    private Table1 table1;

    @Column(name = "some_info", nullable = false)
    private String someInfo;

    @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name = "table_2_id")
    private List<Table3> table3List;
//more stuff
}

@Entity
@Table(name = "table_3")
public class Table3 extends AbstractIdEntity {

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "table_2_id", referencedColumnName = "id")
    private Table2 table2;

    @Lob
    @Column(name = "some_bytes", nullable = false)
    private byte[] someBytes;

    @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name = "table_3_id")
    private List<Table4> table4List;
//more stuff
}

我试图删除对父级的子级引用，但是EntityManager找不到任何已定义的NamedQuery。我试图做的另一件事是切换到休眠状态，这种映射有效，但是在持久化实体时遇到了一些问题。

我正在使用Thorntail v2.4.0.Final和Eclipselink v2.7.3。

有人知道这可能是什么问题吗？

我在一个小项目中创建了类似的层次结构，如果有人想仔细看，则将其上传到github-> githubProject。

Answer 1

这是一个奇怪的例外。我不知道它是否可以解决它，但是您的@OneToMany映射应该使用mappedBy属性，而不要指定@JoinColumn。例如Table3.table2应该这样映射：

    @OneToMany(mappedBy="table2", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    private List<Table3> table3List;

从Java 8迁移到Java 11时出现JPA / eclipselink错误

1 个答案: