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Java 如何将此UML转换为JPA实体_Java_Jpa - Fatal编程技术网

Java 如何将此UML转换为JPA实体

Java 如何将此UML转换为JPA实体,java,jpa,Java,Jpa,我有这个UML图 我试图构建这样的实体(我将Entity类重命名为Entidad) RelationshipType.java @Entity @Table(name = "relationship_type") public class RelationshipType { @Id @GeneratedValue private Long id; private String type; @OneToMany(mappedBy = "relati

我有这个UML图

我试图构建这样的实体(我将
Entity
类重命名为
Entidad

RelationshipType.java

@Entity
@Table(name = "relationship_type")
public class RelationshipType {

    @Id
    @GeneratedValue
    private Long id;

    private String type;

    @OneToMany(mappedBy = "relationshipType", fetch = FetchType.EAGER)
    private Set<Relationship> relationships = new HashSet<Relationship>();
    //Getters and Setters
Entidad.java

@Entity
@Table(name = "entity")
public class Entidad {
    @Id
    @GeneratedValue
    private Long id;

    private String image;

    private String foundationNotes;

    private String alias;

    private Boolean excludeNotifications;

    private String notes;

    //[...]

    @ManyToOne 
    private Relationship related;

    @OneToMany(mappedBy = "entity", fetch = FetchType.EAGER)
    private Set<Relationship> relationships = new HashSet<Relationship>();

现在,我不知道问题出在哪里,需要做好这项工作,因为我正在使用这些实体来构建DB模式。

我认为这是另一种情况,在这个问题中,我有两个来自同一个实体中关系的电话。你可以逐一注释这些行,并确认错误是否是由多对一引起的:@ManyToOne private relations@OneToMany(mappedBy=“entity”,fetch=FetchType.EAGER)私有集关系=newhashset()@amitmahajan是的,如果我评论
@manytone私人关系相关并在RelationshipType中实现可序列化它可以工作,但我想我需要这个字段,但我不确定(我从来没有使用UML图…)我现在已经很久没有使用hibernate了。据我所知,问题是因为hibernate无法将实体与关系联系起来。您可能需要在ManyTone批注上指定一个列属性。我想这是另一种情况,在这个问题中,我有两个来自同一实体中关系的调用。您可以逐个注释这些行,并确认错误是否是由于多对一造成的:@ManyTone private Relationship related@OneToMany(mappedBy=“entity”,fetch=FetchType.EAGER)私有集关系=newhashset()@amitmahajan是的,如果我评论
@manytone私人关系相关并在RelationshipType中实现可序列化它可以工作,但我想我需要这个字段,但我不确定(我从来没有使用UML图…)我现在已经很久没有使用hibernate了。据我所知,问题是因为hibernate无法将实体与关系联系起来。您可能需要在ManyTone注释上指定列属性。
@Entity
@Table(name = "entity")
public class Entidad {
    @Id
    @GeneratedValue
    private Long id;

    private String image;

    private String foundationNotes;

    private String alias;

    private Boolean excludeNotifications;

    private String notes;

    //[...]

    @ManyToOne 
    private Relationship related;

    @OneToMany(mappedBy = "entity", fetch = FetchType.EAGER)
    private Set<Relationship> relationships = new HashSet<Relationship>();
Foreign key (FK_9d8afoh1pv9r59iwjkbcpnud1:entity [])) must have same number of columns as the referenced primary key (relationship [relationshipType_id,entity_id])