Java 获取连接实体的JPA返回递归获取循环

我对

@Get

方法有问题。我有一个实体

ServcieChargeTier

，它与实体

日历条目有
@OneToMany
关系

问题是，当我尝试从服务器获取
ServiceChargeTier
时，服务器返回ServiceChargeTier的递归循环，其中包含
CalendarEntries
，每个都有一个关联的ServiceChargeTier，其中包含
CalendarEntries
，依此类推

我想返回CalendarEntry，但不返回每个CalendarEntry的关联ServiceChargeTier

ServiceChargeTier映射：

public class ServiceChargeTier {

...

@OneToMany(mappedBy = "associatedServiceChargeTier", fetch=FetchType.LAZY, cascade = CascadeType.ALL)
private List<CalendarEntry> calendarEntries = new ArrayList<>();

...
}

当我请求获取ServiceChargeTier时，它会返回一个JSON，如下所示：

[{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":{"id":40629,"calendarEntries":[{"id":40630,"associatedServiceChargeTier":

直到出现stackOverFlow错误。
由于这是一个双向关系，jackson在序列化另一个部分时会不断序列化该关系的每个部分，要解决这个问题，可以使用@JsonIngore

public class CalendarEntry {

...
@JsonIgnore
@ManyToOne(fetch=FetchType.LAZY)
@JoinColumn(name = "service_charge_tier_id")
private ServiceChargeTier associatedServiceChargeTier;

...

}

您还可以创建一个DTO并根据需要转换模型
，因为这是一个双向关系，jackson在序列化其他部分时会不断序列化关系的每个部分，要解决这个问题，您可以使用@JsonIngore

public class CalendarEntry {

...
@JsonIgnore
@ManyToOne(fetch=FetchType.LAZY)
@JoinColumn(name = "service_charge_tier_id")
private ServiceChargeTier associatedServiceChargeTier;

...

}

您还可以创建DTO并根据需要转换模型
序列化为JSON时可以排除该字段。如果您使用Jackson，请检查：这与jpaapi无关，而与JSON有关。它们是完全不同的进程…@Thoomas谢谢，我会仔细阅读。@NeilStockton是的，我的错。当序列化为JSON时，您可以排除该字段。如果您使用Jackson，请检查：这与jpaapi无关，而与JSON有关。它们是完全不同的过程…@Thomas谢谢，我会仔细阅读。@NeilStockton是的，我的错。是的，这就是我想要的。谢谢！：）是的，这就是我想要的。谢谢！：）