Question

我有两个类的多对一映射（代码减少）：

类别：

@Entity
public class Category {

    @Id
    @Column(name = "CATEGORY_ID")
    Long id;

    @NotNull
    String name;

子类别：

@Entity
public class Subcategory {

    @Id
    @Column(name = "SUBCATEGORY_ID")
    Long id;

    @NotNull
    @ManyToOne(targetEntity = Category.class)
    @JoinColumn(name = "CATEGORY_ID")
    Long categoryId;

    @NotNull
    String name;

当我尝试将子类别添加到现有类别时，我得到了

ERROR [org.jboss.ejb3.invocation] JBAS014134: EJB Invocation failed on component SubcategoryController for method public void %package%.SubcategoryController.add(%package%.Subcategory): javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.PropertyAccessException: could not get a field value by reflection getter of %package%.Category.id
...
    at %package%.SubcategoryController$$$view1.add(Unknown Source)
...
    at %package%.SubcategoryController$Proxy$_$$_Weld$Proxy$.add(SubcategoryController$Proxy$_$$_Weld$Proxy$.java)
    at %package%.SubcategoryService.add(SubcategoryService.java:30)
    at %package%.SubcategoryService$Proxy$_$$_WeldClientProxy.add(SubcategoryService$Proxy$_$$_WeldClientProxy.java)
...
Caused by: javax.persistence.PersistenceException: org.hibernate.PropertyAccessException: could not get a field value by reflection getter of %package%.Category.id

我应该怎么做才能解决这个错误？

Answer 1

在您的类别类中，它应该是OneToMany注释，如下所示：

@Entity
public class Category {    
    @Id
    @Column(name = "CATEGORY_ID")
    Long id;    
    @NotNull
    String name;        
    @OneToMany(mappedBy = "category")
    List<Subcategory> subcategories;    
}

您可能还想查看：
www.mkyong.com/hibernate/hibernate-one-to-many-relationship-example-annotation/

PropertyAccessException：无法通过反射getter获取字段值

1 个答案: