在CarDescription您需要添加languageId属性：
@Column(name = "language_id", insertable = false, updatable = false)
private Long languageId;
@NotNull
@OneToOne
@JoinColumn(name = "language_id")
private Language language;
public void setLanguage(Language language) {
this.languageId = language.getId();
this.language = language;
}
然后，您可以Car像这样在实体中使用它：
@OneToMany(mappedBy="car")
@MapKey(name = "languageId")
private Map<Long, CarDescription> carDescription = new HashMap<>(0);
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