cascade="all-delete- orphan“不再被引用

Question

我一直在这里观察这个异常，但我找不到解决方案，所以我想只是粘贴我的代码，以防有什么问题。当我尝试查找EvaluationSelectionCriteria实体时，我接收到此异常。

Exception: org.hibernate.HibernateException: A collection with cascade="all-delete-      orphan" was no longer referenced by the owning entity instance: com.greenvalley.etendering.domain.Candidacy.evaluationSelectionCriterias 


 @OneToMany(cascade = {CascadeType.ALL}, fetch = FetchType.LAZY)
@JoinColumn(name = "candidacy_id", nullable = false)
@XmlElement
@JsonIgnore
@Getter
@Setter
private List<EvaluationSelectionCriteria> evaluationSelectionCriterias = new ArrayList<>();



@ManyToOne
@JoinColumn(name = "candidacy_id", nullable = false, insertable = false, updatable = false)
@XmlTransient
@Getter
@Setter
private Candidacy candidacy;

Answer 1

我已经解决了这个问题，用下面这样的代码替换了我的setXX方法

public void setEvaluationSelectionCriterias(List<EvaluationSelectionCriteria> evaluationSelectionCriterias) {

if(this.evaluationSelectionCriterias == null) { //if not already initialized
  this.evaluationSelectionCriterias = evaluationSelectionCriterias;
} else {
  this.evaluationSelectionCriterias.clear();
  this.evaluationSelectionCriterias.addAll(evaluationSelectionCriterias);
}

Answer 2

我发现在处理@ManyToOne关系时，@JoinTable似乎比单独使用@JoinColumn更好。尝试如下所示：

@OneToMany(cascade = {CascadeType.ALL}, fetch = FetchType.LAZY)
@JoinTable(
   name="candidacy_evaluation_search_criteria",
   joinColumns={ @JoinColumn(name="evaluation_selection_criteria", referencedColumnName="id") },
   inverseJoinColumns={ @JoinColumn(name="candidacy", referencedColumnName="id", unique=true) })
@XmlElement
@JsonIgnore
@Getter
@Setter
private List<EvaluationSelectionCriteria> evaluationSelectionCriterias = new ArrayList<>();

和

@ManyToOne(mappedBy = "evaluationSelectionCriterias")
@XmlTransient
@Getter
@Setter
private Candidacy candidacy;

注意，'criteria‘是’criteria‘的复数，所以你的类名应该是EvaluationSelectionCriterion，集合名应该是evaluationSelectionCriteria。