Hibernate：org.hibernate.MappingException：型を判別できませんでした：java.util.Set

Question

私は、HibernateでSetを使用しようとしています。私がSetテーブルに注釈を書く方法にはわからない問題です。

@Entity 
    @Table(name="user_settings") 
    public class UserSettings { 
    @Id 
    @GeneratedValue 
    private int id; 
    private int userid; 
    protected Set<Integer>foreignLanguageId; 
    public UserSettings() { 

    } 
    public UserSettings(int userid, int nativeLanguageId, 
      Set<Integer> foreignLanguageId, Date birthday) { 
     this.userid = userid; 
     this.nativeLanguageId = nativeLanguageId; 
     this.foreignLanguageId = foreignLanguageId; 
     this.birthday = birthday; 
    } 

    @OneToMany 
    @JoinColumn(name="userid", nullable=false)// This annotation 
    public Set<Integer> getForeignLanguageId() { 
     return foreignLanguageId; 
    } 

エラー：

org.hibernate.MappingException: Could not determine type for: java.util.Set, at table: user_settings, for columns: [org.hibernate.mapping.Column(foreignLanguageId)] 
at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:314)........... 

Answer 1

あなたがIntegerを使用したい場合は、@ElementCollection

@Entity 
@Table(name="user_settings") 
public class UserSettings { 

    private Set<Integer> foreignLanguages; 

    @ElementCollection 
    public Set<Integer> getForeignLanguages() { 
     return foreignLanguages; 
    } 

}