JPA to GET a joined entity returns a recursive fetch loop

Question

I have a problem with a @Get method. I have an entity ServcieChargeTier which has a @OneToMany relationship with the entity CalendarEntry.

The problem is when I try and get a ServiceChargeTier from the server, the server returns a recursive loop of the ServiceChargeTier, which has CalendarEntries, which each has a ServiceChargeTier associated, which has the CalendarEntries and so on.

I would like to return the CalendarEntry's but not the associated ServiceChargeTier for each CalendarEntry.

ServiceChargeTier Mapping:

public class ServiceChargeTier {

...

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

...
}

CalendarEntry Mapping:

public class CalendarEntry {

...

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

...
}

When I make a request to get a ServiceChargeTier it returns a JSON like this:

[{"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":

until it gives a stackOverFlow error.

You can exclude the field when serializing to JSON. If you use Jackson, check this : baeldung.com/jackson-ignore-properties-on-serialization — Thoomas
– Thoomas, Commented Aug 17, 2017 at 10:16
which is nothing to do with the JPA API, and everything to do with JSON. They are totally different processes ... — Neil Stockton
– Neil Stockton, Commented Aug 17, 2017 at 10:22

Amer Qarabsa · Accepted Answer · 2017-08-17 10:16:23Z

1

Since this is a bidirectional relation jackson will keep serializing each part of the relation when serializing the other, to solve it you can use @JsonIngore

public class CalendarEntry {

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

...

}

you could also create a DTO and convert your model as you want

answered Aug 17, 2017 at 10:16

Amer Qarabsa

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1 Comment

Ray Over a year ago

Yep, that's what I wanted. Thank you! :)

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