尝试映射递归关系时出错

Question

我试图使用JPA映射递归关系。我不知道为什么我在@OneToMany线上出现了一些错误。 这是一个代码示例：

@Entity
public class RecursiveType implements Serializable {

    private static final long serialVersionUID = -2459343636539882731L;

    @Id
    public int id;

    @OneToMany(mappedBy="rec1", cascade=CascadeType.PERSIST) //here is where I get the errors
    public RecursiveType rec1;
    public Map<String, Map<RecursiveType, List<Map<RecursiveType, List<InnerTypes>>>>> rec2;

    //getters and setters
}

persistence.xml档

行

    <class>pt.ptinovacao.persistencetester.model.RecursiveType</class>

我有几个错误，例如：＆＃34;目标实体未定义＆＃34;和＃34;集合映射的属性类型必须是java.util.Collection ...＆＃34; 为什么会这样？

Answer 1

我已修复它，我只是更改了注释和关系类型

@Entity
public class RecursiveType implements Serializable {

    private static final long serialVersionUID = -2459343636539882731L;

    @Id
    public int id;

    @OneToOne(cascade=CascadeType.ALL)
    @JoinColumn(name="REC1_ID", referencedColumnName="ID")
    public RecursiveType rec1;    
    public Map<String, Map<RecursiveType, List<Map<RecursiveType, List<InnerTypes>>>>> rec2; //I really don't need to try and map this xD

    //getters and setters
}