Question

我希望有人可以为我阐明这一点。我真的不明白这个错误出了什么问题。我有一个实体用于在数据库中创建许多条目。当事务结束并完成同步时，我得到一个illegalStateException。这一切都在从提供所有数据的Web服务填充数据库的过程中。现在，我以一种不会导致任何外键约束错误的方式解析数据，但与实体的关系阻止了我。

Caused by: java.lang.IllegalStateException: During synchronization a new object was found through a relationship that was not marked cascade PERSIST: entities.cmic.ajrs.com.Categories[pkId=null].

我试图坚持的实体叫做ProductBase。 ProductBase有一个名为pkBrand的外键到Brand_Data表，并带有相应的实体BrandData。

我可以为这些关系将CascadeType设置为ALL，但我真的不想在此时创建该实体。

以下是实体（减去一些吸气剂和制定者）

@Entity
@Table(name = "product_base")
@NamedQueries({
    @NamedQuery(name = "ProductBase.findAll", query = "SELECT p FROM ProductBase p"),
    @NamedQuery(name = "ProductBase.findByPkId", query = "SELECT p FROM ProductBase p WHERE p.pkId = :pkId"),
    @NamedQuery(name = "ProductBase.findByColorsAvail", query = "SELECT p FROM ProductBase p WHERE p.colorsAvail = :colorsAvail"),
    @NamedQuery(name = "ProductBase.findBySeriesName", query = "SELECT p FROM ProductBase p WHERE p.seriesName = :seriesName"),
    @NamedQuery(name = "ProductBase.findByStatusCodes", query = "SELECT p FROM ProductBase p WHERE p.statusCodes = :statusCodes"),
    @NamedQuery(name = "ProductBase.findByTs", query = "SELECT p FROM ProductBase p WHERE p.ts = :ts")})
public class ProductBase implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @Column(name = "pk_id")
    private Integer pkId;
    @Column(name = "colors_avail")
    private String colorsAvail;
    @Column(name = "series_name")
    private String seriesName;
    @Column(name = "status_codes")
    private String statusCodes;
    @Basic(optional = false)
    @Column(name = "ts")
    @Temporal(TemporalType.TIMESTAMP)
    private Date ts;
    @OneToMany(mappedBy = "productBase", fetch = FetchType.LAZY)
    private Collection<ProductSorts> productSortsCollection;
    @OneToOne(cascade = CascadeType.ALL, mappedBy = "productBase", fetch = FetchType.LAZY)
    private MapTarget mapTarget;
    @OneToOne(cascade = CascadeType.ALL, mappedBy = "productBase", fetch = FetchType.LAZY)
    private KeyFeatures keyFeatures;
    @JoinColumn(name = "pk_category", referencedColumnName = "pk_id")
    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    private Categories categories;
    @JoinColumn(name = "pk_brand", referencedColumnName = "pk_id")
    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    private BrandData brandData;
    @OneToMany(mappedBy = "productBase", fetch = FetchType.LAZY)
    private Collection<PromotionsByModel> promotionsByModelCollection;
    @OneToMany(mappedBy = "productBase", fetch = FetchType.LAZY)
    private Collection<ProductEnhancedFeatures> productEnhancementFeaturesCollection;
    @OneToMany(mappedBy = "productBase", fetch = FetchType.LAZY)
    private Collection<SkuBasic> skuBasicCollection;
    @OneToMany(mappedBy = "productBase", fetch = FetchType.LAZY)
    private Collection<ProductMeasurements> productMeasurementsCollection;

    public ProductBase() {
    }


@Entity
@Table(name = "brand_data")
@NamedQueries({
    @NamedQuery(name = "BrandData.findAll", query = "SELECT b FROM BrandData b"),
    @NamedQuery(name = "BrandData.findByPkId", query = "SELECT b FROM BrandData b WHERE b.pkId = :pkId"),
    @NamedQuery(name = "BrandData.findByCommonBrandId", query = "SELECT b FROM BrandData b WHERE b.commonBrandId = :commonBrandId"),
    @NamedQuery(name = "BrandData.findByCommonBrandName", query = "SELECT b FROM BrandData b WHERE b.commonBrandName = :commonBrandName"),
    @NamedQuery(name = "BrandData.findByTs", query = "SELECT b FROM BrandData b WHERE b.ts = :ts")})
public class BrandData implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @Column(name = "pk_id")
    private Integer pkId;
    @Column(name = "common_brand_id")
    private String commonBrandId;
    @Column(name = "common_brand_name")
    private String commonBrandName;
    @Basic(optional = false)
    @Column(name = "ts")
    @Temporal(TemporalType.TIMESTAMP)
    private Date ts;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "brandData", fetch = FetchType.LAZY)
    private Collection<ProductBase> productBaseCollection;

    public BrandData() {
    }

Answer 1

异常明确表示ProductBase引用了未保存的Categories实例。

如果是故意的并且您确实想要保存Categories的新实例，则可以为该关系配置级联，或者在保存ProductBase之前手动保存该实例。

否则，如果ProductBase应该引用Categories的现有持久化实例，则需要从数据库加载该实例而不是创建新实例。

JPA illegalStateException - CascadeType问题

1 个答案: