Hibernate @OneToOne引用未知的实体错误 [英] Hibernate @OneToOne References an Unknown Entity Error

问题描述

我很难找到导致错误的根本原因，我的@OneToOne映射不起作用，并返回引用未知实体异常。

首先，我确保两个类都使用@Entity标签正确注释。另外值得注意的是我的Product.java类（你会在下面看到）工作的很好，而且当我尝试将外键附加到引用Product.java类的Project.java类时，只会遇到问题。

Project.java和Product.java的Java代码

  @Entity 
 @Table（name =project）
 @SequenceGenerator（name =seq_project，sequenceName =BI **********.SEQ_PROJECT，allocationSize = 1，initialValue = 1）
 public class Project {
 
 // Fields 
 @Id 
 @GeneratedValue（strategy = GenerationType.SEQUENCE，generator =seq_project）
 @Column（name =PROJECT_ID）
 private int id; 
 @Column（name =PROJECT_CODE）
 private String projectCode; 
 @Column（name =PRODUCT_ID）
 private int productId; 
 @Column（name =DESCRIPTION）
私有字符串描述; 
 
 @OneToOne（cascade = CascadeType.ALL，fetch = FetchType.EAGER）
 // @ PrimaryKeyJoinColumn 
 @JoinColumn（name =PRODUCT.PRODUCT_ID）
私人产品; 
 
 
 @Entity 
 @Table（name =PRODUCT）
 @SequenceGenerator（name =seq_product，sequenceName =BI ****** ******。SEQ_PRODUCT，allocationSize = 1，initialValue = 1）
 public class Product {
 
 //字段
 @Id 
 @GeneratedValue（ strategy = GenerationType.SEQUENCE，generator =seq_product）
 @Column（name =PRODUCT_ID）
 private int productId; 
 @Column（name =PRODUCT_NAME）
 private String productName; 
 @Column（name =DESCRIPTION）
私有字符串描述; 
 @OneToOne（mappedBy =Project）
 @JoinColumn（name =PROJET_FK1）
私人项目项目; 
  

以下是我收到的错误代码：

 线程main中的异常org.hibernate.AnnotationException：com.manh.entries.Project.product中的@OneToOne或@ManyToOne引用未知实体：com.manh.entries .Product 
  

感谢您的任何帮助和建议。

解决方案

这是一个配置问题。 Hibernate无法识别类 Product 作为实体。

I'm having a hard time finding the root cause of an error where my @OneToOne mapping isn't working and is returning a "references an unknown entity" exception.

To start with I ensured that both classes are properly annotated with the @Entity tag. Also it is worth noting my Product.java class (which you will see below) worked fine and only encounters a problem when I try to attach a foreign key to my Project.java class referencing the Product.java class.

Java Code for Project.java and Product.java

@Entity
@Table (name="project")
@SequenceGenerator(name="seq_project",sequenceName="BI**********.SEQ_PROJECT", allocationSize=1, initialValue=1)
public class Project {

    //Fields
    @Id
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="seq_project")
    @Column(name="PROJECT_ID")
    private int id;
    @Column(name="PROJECT_CODE")
    private String projectCode;
    @Column(name="PRODUCT_ID")
    private int productId;
    @Column(name="DESCRIPTION")
    private String description;

    @OneToOne(cascade=CascadeType.ALL, fetch=FetchType.EAGER)
    //@PrimaryKeyJoinColumn
    @JoinColumn(name="PRODUCT.PRODUCT_ID")
    private Product product;


@Entity
@Table (name="PRODUCT")
@SequenceGenerator(name="seq_product",sequenceName="BI************.SEQ_PRODUCT", allocationSize=1, initialValue=1)
public class Product {

    //Fields
    @Id
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="seq_product")
    @Column(name="PRODUCT_ID")
    private int productId;
    @Column(name="PRODUCT_NAME")
    private String productName;
    @Column(name="DESCRIPTION")
    private String description;
    @OneToOne(mappedBy="Project")
    @JoinColumn(name="PROJET_FK1")
    private Project project;

Here is the error code I'm getting:

Exception in thread "main" org.hibernate.AnnotationException: @OneToOne or @ManyToOne on com.manh.entries.Project.product references an unknown entity: com.manh.entries.Product

Thanks for any help and advice.

解决方案

It's a configuration problem. Hibernate doesn't recognize class Product as a entity.

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