@OneTomany双向联接列正在插入“null”值（Hibernate）

Question

@Entity
@Table(name="product_details")
public class ProductDetails {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="ID")
private int id;        

@Column(name="PRODUCT_ID")
private String productId;

@Column(name="PRODUCT_NAME")
private String productName;

@OneToMany(mappedBy="productDetails", cascade=CascadeType.ALL)
private Set<VnfDetails> vnfd;


public Set<VnfDetails> getVnfd() {
    return vnfd;
}

public void setVnfd(Set<VnfDetails> vnfd) {
    this.vnfd = vnfd;
}

public int getId() {
    return id;
}

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

public String getProductId() {
    return productId;
}

public void setProductId(String productId) {
    this.productId = productId;
}

public String getProductName() {
    return productName;
}

public void setProductName(String productName) {
    this.productName = productName;
}

@Entity
@Table(name="vnf_details")
public class VnfDetails {


@Id
@Column(name="VNF_ID")
private String vnfId;

@Column(name="VNF_NAME")
private String vnfName;

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name="PRODUCT_ID")
private ProductDetails productDetails;

public ProductDetails getProductDetails() {
    return productDetails;
}

public void setProductDetails(ProductDetails productDetails) {
    this.productDetails = productDetails;
}

public String getVnfId() {
    return vnfId;
}

public void setVnfId(String vnfId) {
    this.vnfId = vnfId;
}

public String getVnfName() {
    return vnfName;
}

public void setVnfName(String vnfName) {
    this.vnfName = vnfName;
}

无法解决此问题。

Answer 1

在单向映射中，我也遇到过类似的问题，即在外键列中插入null值，并得到运行时异常、datavoilation异常。

通过在@joincolumn上添加nullable=false来修复问题

@OnetoMany
@JoinColumn(nullable=false) 

并移除子实体中的外键列定义。