通过postman插入数据时SpringBoot-Hibernate映射中的NullPointerException

Question

以下是该实体的：

public class ProductOffer extends AuditModel implements Serializable {

    @Id
    @GeneratedValue(strategy =  GenerationType.IDENTITY)
    private Integer id = null;
    
    @Column(name = "offer_code", nullable = false)
    private String offerCode = null;

    @NotNull
    @Column(unique = true)
    private String version = null;

    @Column
    private String offerCodeVersion = null;

    @Column
    private String offerName = null;

    @Column
    private String description = null;

    @Column
    private String status = null;

    @JsonProperty
    private OperationEnum operation;

    @ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    @JoinColumn(name = "lifecycleStatus_id", referencedColumnName = "lId")
    @JsonIgnore
    private LifeCycleStatus lifecycleStatus = null;
}

public class LifeCycleStatus extends AuditModel implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer lId = null;

    @Column
    private String name = null;
    
    @OneToMany(mappedBy = "lifecycleStatus", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private List<ProductOffer> productOffer = new ArrayList<ProductOffer>();
}

这是道：

public void addProductOffer(ProductOffer productOffer) {

        Session session = entityManager.unwrap(Session.class);
        LifeCycleStatus lifeCycleStatus = lifeCycleStatusDAO.findById(productOffer.getLifecycleStatus().getLId()); /* am getting NPE here */
        if(lifeCycleStatus == null)
            lifeCycleStatus = new LifeCycleStatus();
        lifeCycleStatus.setName(productOffer.getLifecycleStatus().getName());
        productOffer.setLifecycleStatus(lifeCycleStatus);
        session.saveOrUpdate(productOffer);
    }

下面是Post映射的详细信息：

{

   "offerCode":"HG123",
   "version":"2",
   "offerCodeVersion":"2.2",
   "offerName":"Recharge",
   "description":"aadhakjdhaks",
   "status":"Inactive",
   "operation":"PUBLISH",
   "lifecycleStatus":{
       "lId":2,
       "name":"InActive"
   }
}

Answer 1

我知道这很傻，但是你能把lid重命名为lid（大写的'I'改为小写的'I')吗？？

变量名lid与所有小的后者，并在所有其他文件中做相关的更改，以及在DAO中，然后再试一次！

也由邮递员用“盖子”发送请求（均为小后）