Hibernate 中的@MappedSuperClass = AnnotationException: Unknown mappedBy

Question

错误： 原因：org.hibernate.AnnotationException: Unknown mappedBy in: com.xxx.data.dao.classes.Categories.categoriesLang，引用属性未知：com.xxx.data.dao.classes.superclasses.CategoriesLang.categories

我的设置：

休眠 3.5.6

public interface CategoriesLangInt {

    int id_categories = 0;
    Categories categories = null;
    String name = "";
    String description = "";

    int getId_categories();

    void setId_categories(int id_categories);

    Categories getCategories();

    void setCategories(Categories categories);

    String getName();

    void setName(String name);

    String getDescription();

    void setDescription(String description);
}

---

@MappedSuperclass
public abstract class CategoriesLang implements CategoriesLangInt {

    @Id
    @Column(name = "id_categories")
    private int id_categories = 0;
    @OneToOne
    @JoinColumn(name = "id_categories")
    private Categories categories;
    @Size(max = 50)
    private String name = "";
    @Size(max = 350)
    private String description = "";

    @Override
    public int getId_categories() {
        return id_categories;
    }

    @Override
    public void setId_categories(int id_categories) {
        this.id_categories = id_categories;
    }

    @Override
    public Categories getCategories() {
        return categories;
    }

    @Override
    public void setCategories(Categories categories) {
        this.categories = categories;
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String getDescription() {
        return description;
    }

    @Override
    public void setDescription(String description) {
        this.description = description;
    }

}

---

@Entity
@Table(name="categories")
public class Categories implements Serializable {

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Integer id_categories;
    private boolean active;
    @OneToOne(mappedBy="categories")
    private CategoriesLangInt categoriesLangInt;

    public Integer getId_categories() {
        return id_categories;
    }

    public void setId_categories(Integer id_categories) {
        this.id_categories = id_categories;
    }

    public boolean isActive() {
        return active;
    }

    public void setActive(boolean active) {
        this.active = active;
    }

    public CategoriesLangInt getCategoriesLangInt() {
        return categoriesLangInt;
    }

    public void setCategoriesLangInt(CategoriesLangInt categoriesLangInt) {
        this.categoriesLangInt = categoriesLangInt;
    }

}

更新解决了！！！

经过长时间的研究最终我成功了。效果很好！

@Entity
@Table(name="categories")
public class Category implements Serializable {

    private Integer id;
    private boolean active;

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public boolean isActive() {
        return active;
    }

    public void setActive(boolean active) {
        this.active = active;
    }

}

---

public interface CategoryInt{

    int getCategory_id();

    void setCategory_id(int category_id);

    String getName();

    void setName(String name);

    String getDescription();

    void setDescription(String description);

    void setCategory(Category category);

    Category getCategory();
}

---

@MappedSuperclass
public abstract class CategoryLang implements CategoryInt{

    private int category_id;
    private String name;
    private String description;
    private Category category;

    @Override
    @Id
    public int getCategory_id() {
        return category_id;
    }

    @Override
    public void setCategory_id(int category_id) {
        this.category_id = category_id;
    }

    @Override
    @Size(max = 50)
    public String getName() {
        return name;
    }

    @Override
    public void setName(String name) {
        this.name = name;
    }

    @Override
    @Size(max = 350)
    public String getDescription() {
        return description;
    }

    @Override
    public void setDescription(String description) {
        this.description = description;
    }

    @Override
    @OneToOne(cascade = CascadeType.ALL)
    @PrimaryKeyJoinColumn
    public Category getCategory() {
        return category;
    }

    @Override
    public void setCategory(Category category) {
        this.category = category;
    }
}

---

@Entity
@Table(name = "en_categories")
public class CategoryEN extends CategoryLang implements Serializable {}

---

@Entity
@Table(name = "es_categories")
public class CategoryES extends CategoryLang implements Serializable {}

Answer 1

首先，接口可能不定义字段，而只定义方法。您在接口中声明的字段实际上是公共静态最终常量。

之后，Categories 实体有一个 CategoriesLangInt 字段，但 Hibernate 无法知道该字段代表哪个实体，因为可能有多个实体实现此接口。您必须使用 OneToOne 注释的targetEntity 属性来告诉 Hibernate 引用了哪个实体。

最后，CategoriesLang 中的id_categories 列被映射了两次：一次作为ID，一次作为JoinColumn。您必须删除id_categories 字段并使用@Id 注释categories 字段，或者保留id_categories 字段原样并将@MapsId 注释添加到categories。

旁注：您应该尊重 Java 命名约定（字段和方法中没有下划线），并将 Categories 重命名为 Category、CategoriesLang 重命名为 CategoryLang 等。

Answer 2

我认为这是因为您的超类（接口，此处）中的字段被扩展类中类似名称的字段所遮蔽。尝试从界面中删除这些字段（如类别）。