java - 在entitymanager上调用merge之后，实体失去状态

我遇到了一个非常烦人的问题，即在对象合并到EntityManager后，实体失去了状态。

在该应用程序中，有一个ExpeditureStatements的“档案”，其中包含许多支出。

这些支出可以（部分）由多个债务人索偿。
将为ExpenditureStatement创建一个ExpenditureStatementClaim。
在ExpenditureStatement上为每个支出创建一个ExpenditureClaim。

ExpenditureClaims和ExpenditureStatementClaim都持久存在，没有任何问题。
但是，在entitymanager上的合并被称为后，支出将失去其状态：
em.merge（档案）。

但是，每笔支出中的数据都会还原到数据库中的最后状态。

我已经尝试过仅从上到下级联，我对equals / hashcode进行了更改，但这没有任何改变。

是否有人对导致此问题的原因有任何线索？

卷宗：

@Entity
@Table(name = "DOSSIER")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "DOSSIER_TYPE", discriminatorType = DiscriminatorType.STRING, length = 48)
public abstract class Dossier  {

@OneToMany(mappedBy = ExpenditureStatement.PROP_DOSSIER, cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.LAZY)
private List<ExpenditureStatement> expenditureStatements = new ArrayList<ExpenditureStatement>();
}

支出报表：

@Entity
@Table(name = "EXPENDITURE_STATEMENT")
public class ExpenditureStatement {
@ManyToOne(fetch = FetchType.LAZY, cascade = {CascadeType.MERGE})
@JoinColumn(name = "DOSSIER_ID", nullable = false)
private Dossier dossier;

@OneToMany(mappedBy = Expenditure.PROP_EXPENDITURE_STATEMENT, cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER)
private List<Expenditure> expenditures = new ArrayList<Expenditure>();

@OneToMany(mappedBy = ExpenditureStatementClaim.PROP_EXPENDITURE_STATEMENT, cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER)
private Collection<ExpenditureStatementClaim> expenditureStatementClaims = new ArrayList<ExpenditureStatementClaim>();
}

支出：

@Entity
@Table(name = "EXPENDITURE")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "EXPENDITURE_ORIGIN_CD", discriminatorType = DiscriminatorType.STRING, length = 48)
public abstract class Expenditure extends EntityObject<Long> {

@ManyToOne(fetch = FetchType.EAGER, cascade = {CascadeType.PERSIST, CascadeType.MERGE})
@JoinColumn(name = "EXPENDITURE_STATEMENT_ID", nullable = false)
private ExpenditureStatement expenditureStatement;

@OneToMany(mappedBy = ExpenditureClaim.PROP_EXPENDITURE, cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER)
private Collection<ExpenditureClaim> claims = new HashSet<>();

@NotNull
@Column(name = "EXPENDITURE_STATUS_CD", nullable = false)
@Enumerated(EnumType.STRING)
private ExpenditureStatus status;

public abstract BigDecimal getAmount();
}

ExpenditureStatement声明：

@Entity
@Table(name = "DEEL_STAAT")
public class ExpenditureStatementClaim {

@NotNull
@ManyToOne(cascade = {CascadeType.MERGE, CascadeType.PERSIST})
@JoinColumn(name = "EXPENDITURE_STATEMENT_ID", nullable = false)
private ExpenditureStatement expenditureStatement;

@OneToMany(mappedBy = ExpenditureClaim.PROP_EXPENDITURE_STATEMENT_CLAIM, cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER)
private Collection<ExpenditureClaim> expenditureClaims = new ArrayList<>();

@ManyToOne(cascade=CascadeType.ALL)
@JoinColumn(name = "INVOICE_ID")
private Invoice invoice;
}

支出说明：

@Entity
@Table(name = "EXPENDITURE_CLAIM")
public class ExpenditureClaim extends EntityObject<Long> {

@ManyToOne(fetch = FetchType.EAGER, cascade = {CascadeType.PERSIST, CascadeType.MERGE})
@JoinColumn(name = "EXPENDITURE_ID", nullable = false)
private Expenditure expenditure;

@Column(name = "AMOUNT", precision = NumberConstants.CURRENCY_PRECISION, scale = NumberConstants.CURRENCY_OPERATION_SCALE)
private BigDecimal amount;

@ManyToOne(fetch = FetchType.EAGER, cascade = {CascadeType.PERSIST, CascadeType.MERGE})
@JoinColumn(name = "EXPENDITURE_ST_CLAIM_ID", nullable = false)
private ExpenditureStatementClaim expenditureStatementClaim;
}

最佳答案

该问题不是由映射问题引起的，而是由于（正在使用的）（相当旧的）EclipseLink版本中的错误，该项目正在使用该项目，因此新创建的对象将不会级联对现有对象的更改。

https://bugs.eclipse.org/bugs/show_bug.cgi?id=340802

提醒您，只要有可能，您都应尝试更新项目中依赖项的版本...