Question

出于遗留原因，我在数据库中有组合键，因此我使用@IdClass来映射它们（在使用@Embeddedid之前，但它具有自己的错误）。但是，每当我尝试保存包含代理作为ID字段的组合键实体时，我都会遇到问题。我做了一个非常简单的示例来隔离此问题（示例使用Spring Data，但我认为它无关紧要）。 ps。我知道没有必要调用.save，但不会引起异常。

@Entity
public class Image {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private String fileName;

    public Long getId() {
        return id;
    }

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

    public String getFileName() {
        return fileName;
    }

    public void setFileName(String fileName) {
        this.fileName = fileName;
    }
}

@Entity
public class Product {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private String name;

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

@Entity
@IdClass(ProductImage.ProductImageId.class)
public class ProductImage {

    public static class ProductImageId implements Serializable {

        private static final long serialVersionUID = 8542391285589067304L;

        private Long product;

        private Long image;

        public ProductImageId() {
        }

        public Long getProduct() {
            return product;
        }

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

        public Long getImage() {
            return image;
        }

        public void setImage(Long image) {
            this.image = image;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;
            ProductImageId that = (ProductImageId) o;
            return Objects.equals(product, that.product) &&
                    Objects.equals(image, that.image);
        }

        @Override
        public int hashCode() {
            return Objects.hash(product, image);
        }
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @Id
    private Product product;

    @ManyToOne(fetch = FetchType.LAZY)
    @Id
    private Image image;

    private Integer number;

    public Product getProduct() {
        return product;
    }

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

    public Image getImage() {
        return image;
    }

    public void setImage(Image image) {
        this.image = image;
    }

    public Integer getNumber() {
        return number;
    }

    public void setNumber(Integer number) {
        this.number = number;
    }
}

    List<ProductImage> productImages = productImageRepository.findAll();
    productImages.get(0).setNumber(456);
    productImageRepository.save(productImages.get(0));

原因：java.lang.IllegalArgumentException：无法将类型“ com.example.springbootnewplayground.Product $ HibernateProxy $ AJ38NiN6”的值转换为属性“ product”的必需类型“ java.lang.Long”：PropertyEditor [org。 springframework.beans.propertyeditors.CustomNumberEditor]返回了类型不正确的值'com.example.springbootnewplayground.Product $ HibernateProxy $ AJ38NiN6' 在org.springframework.beans.TypeConverterDelegate.convertIfNecessary（TypeConverterDelegate.java:258）〜[spring-beans-5.1.6.RELEASE.jar：5.1.6.RELEASE] 在org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary（AbstractNestablePropertyAccessor.java:585）〜[spring-beans-5.1.6.RELEASE.jar：5.1.6.RELEASE] ...省略了69个共同的框架

在Hibernate中使用@IdClass时代理问题

0 个答案: