休眠问题 - “使用@OneToMany或@ManyToMany定位未映射的类” [英] Hibernate problem - "Use of @OneToMany or @ManyToMany targeting an unmapped class"

问题描述

我有2个实体，Section和ScopeTopic 。 Section有一个List类成员，所以是一对多关系。当我运行我的单元测试时，我得到了这个异常：

使用@OneToMany或@ManyToMany来定位未映射的类：com.xxx。 domain.Section.scopeTopic [com.xxx.domain.ScopeTopic]

我认为错误意味着我的ScopeTopic实体isn' t映射到表？我看不到我做错了。这里是实体类：

---

  @Entity 
 public class Section {
私人长ID; 
私人列表< ScopeTopic> scopeTopics; 
 $ b $ public Section（）{} 
 
 @Id 
 public Long getId（）{
 return id; 
} 
 
 public void setId（Long id）{
 this.id = id; 
} 
 
 @OneToMany 
 @JoinTable（name =section_scope，joinColumns = {@JoinColumn（name =section_id）}，
 inverseJoinColumns = {@ JoinColumn（name =scope_topic_id）}）
 public List< ScopeTopic> getScopeTopic（）{
 return scopeTopic; 
} 
 
 public void setScopeTopic（List< ScopeTopic> scopeTopic）{
 this.scopeTopic = scopeTopic; 
 
 
  

---

 @Entity 
 @Table（name =scope_topic）
 public class ScopeTopic {
 private Long id; 
私人字符串主题; 
 
 public Sc​​opeTopic（）{} 
 $ b @Id 
 public Long getId（）{
 return id; 
} 
 
 public void setId（）{
 this.id = id; 
} 
 
 public String getTopic（）{
 return topic; 
} 
 
 public void setTopic（String topic）{
 this.topic = topic; 
 
 
 $ / code $ / pre 
 
 $ hr 
 
 
我很确定这是我自己对缺点的理解，所以有些指导是非常好的，谢谢！
    

你的注释看起来不错。以下是要检查的事项：确保注释 javax.persistence.Entity code>，而不是 org.hibernate.annotations.Entity 。前者使实体可检测。如果你手动列出你的实体（在persistence.xml中，在hibernate.cfg.xml中，或配置你的会话时）。 工厂），然后确保你也列出了 ScopeTopic 实体


确保你没有在不同的软件包中有多个 ScopeTopic 类，并且导入了错误的。

I'm finding my feet with Hibernate Annotations and I've hit a problem I hope some one can help with.

I have 2 entities, Section and ScopeTopic. Section has a List class member, so a One to Many relationship. When I run my unit test I am getting this exception:

Use of @OneToMany or @ManyToMany targeting an unmapped class: com.xxx.domain.Section.scopeTopic[com.xxx.domain.ScopeTopic]

I would assume that the error implies that my ScopeTopic entity isn't mapped to a table? I can't see with I have done wrong. Here are the Entity classes:

---

@Entity
public class Section {
    private Long id;
    private List<ScopeTopic> scopeTopics;

    public Section() {}

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

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

    @OneToMany
    @JoinTable(name = "section_scope", joinColumns = {@JoinColumn(name="section_id")},
               inverseJoinColumns = {@JoinColumn(name="scope_topic_id")} )
    public List<ScopeTopic> getScopeTopic() {
        return scopeTopic;
    }

    public void setScopeTopic(List<ScopeTopic> scopeTopic) {
        this.scopeTopic = scopeTopic;
    }
}

---

@Entity
@Table(name = "scope_topic")
public class ScopeTopic {
    private Long id;
    private String topic;

    public ScopeTopic() {}

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

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

    public String getTopic() {
        return topic;
    }

    public void setTopic(String topic) {
        this.topic = topic;
    }
}

---

I'm pretty sure it's my own lack of understanding that's at fault so some guidance would be great, thanks!

解决方案

Your annotations look fine. Here are the things to check:

• make sure the annotation is javax.persistence.Entity, and not org.hibernate.annotations.Entity. The former makes the entity detectable. The latter is just an addition.

• if you are manually listing your entities (in persistence.xml, in hibernate.cfg.xml, or when configuring your session factory), then make sure you have also listed the ScopeTopic entity

• make sure you don't have multiple ScopeTopic classes in different packages, and you've imported the wrong one.

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