java - Hibernate 无法访问带注释的属性的值

Question

Hibernate 抛出异常:

    org.hibernate.PropertyAccessException: 
could not get a field value by reflection getter of test.model.Part.part

零件实体类:

@Table(name = "part")
@Entity
public class Part implements Serializable {

    @Id @GeneratedValue
    @Column(name = "part")
    private int part;

    public int getPart() {
        return part;
    }

    public void setPart(int part) {
        this.part = part;
        }
@OneToMany(mappedBy = "part")
        private Collection<ProductPart> productPartsByPart;
        public Collection<ProductPart> getProductPartsByPart() {
            return productPartsByPart;
        }
    .....
  }

实体类似乎有正确的注释，但 Hibernate 无法访问属性 id和 Part 中的主键 table 。怎么解决？

它被调用:

ProductPart productPart  = (ProductPart) sessionFactory
                .getCurrentSession()
                .createCriteria(ProductPart.class)
                .add(Restrictions.eq("part", cPartId))
                .add(Restrictions.eq("product", productId)).uniqueResult();

更新:

    Caused by: java.lang.IllegalArgumentException: 
Can not set int field Part.part   to java.lang.Integer

更新 2:我有product_part表格，其中有fk和引用文献part在part table 。我必须使用 @OneToMany(mappedBy = "part") ？

@Entity
@Table (name = "part")
public class Part implements Serializable {

    @Id @GeneratedValue
    @Column(name = "part")
    @OneToMany(mappedBy = "part")
    private int  part;

更新3

我不明白为什么 Hibernate 尝试访问 Part当我声明我只需要在 product_part 上执行搜索时，表 table 。也没有必要访问其他表，因为我只需要 Product_part 中的字段，该字段为 part 和 product (都是外键)给出了值....

更新4:

@Entity
@Table(name = "product_part")
public class ProductPart implements Serializable {

    @Id
    @GeneratedValue
    @Column(name = "id")
    private int id;


    public int getId() {
        return id;
    }

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

    @ManyToOne
    @JoinColumn(name = "product", referencedColumnName = "product", nullable = false)
    private Product product;

    public Product getProduct() {
        return product;
    }

    public void setProduct(Product product) {
        this.product = product;
    }


    @JoinColumn(name = "part", referencedColumnName = "part", nullable = false)
    @ManyToOne
    private Part part;

    public Part getPart() {
        return part;
    }

    public void setPart(Part partByPart) {
        this.part = partByPart;
    }
}

Answer 1

您的产品部件中如何引用您的部件？

应该是这样的

ProductPart{

@ManyToOne
private Part part;
}

你猜是这样

将 .add(Restrictions.eq("part", cPartId)) 更改为 .add(Restrictions.eq("part.part", cPartId))

编辑:

ProductPart productPart  = (ProductPart) sessionFactory
                .getCurrentSession()
                .createCriteria(ProductPart.class)
                .add(Restrictions.eq("part.part", cPartId))
                .add(Restrictions.eq("product", productId)).uniqueResult();//here similarly access your Product's @Id
                                                                           //something like product.productId