How to prevent hibernate lazy loading when using jackson with spring boot?

Question

i'm using spring boot, jackson and hibernate for a basic backend with an rest (more or less rest..) api.

Now the issue is, that i'd like to use the entity and not wanna use a dto to keep complexity low.

The issue is, that when i retrieve an entity with a collection, jackson will fetch stuff and yes there is a circle in it.

What i would prefer is to be able to use spring data, jackson and the entity class but controlling the associations manually.

I don't want to configure it with JsonIgnore or other annotations.

Tx!

"and not wanna use dto" - How are you gong to handle Serialization? Don't you want to hide your representational data? DTO's were not made to make life harder, but to encompass the underpinnings of your entities. — Dan
– Dan, Commented Aug 7, 2018 at 20:45
@Dan it is a small project with a clear scope. There is no need for it. DTOs just add another code bloat in this case. — sigi
– sigi, Commented Aug 8, 2018 at 11:09

Antoniossss · Accepted Answer · 2018-08-07 22:03:25Z

1

Couple of ways to do this

Use @JsonIgnore
Use @JsonManagedReference (something like this) and @JsonBackReference
My favorite - use @JsonView

What for?

Will exclude unwanted properties from serialization/deserialization
Is made explicitly to solve circular dependencies serialization/deserialization
Keeps your payload as small as possible - this allows you to pick which properties should be serialized for given endpoint.

Which one is best suited for you?

Well its up to you, but from the description, looks like 2 is the way to go (maybe combined with 3) Good luck!

answered Aug 7, 2018 at 22:03

Antoniossss

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Martin Frey · Accepted Answer · 2018-08-08 07:32:39Z

0

DTOs are the way to go in more complex scenarios, especially on the inbound side. For dynamic filtering of simpler use cases i wrote an addon for jackson to use antpath style filtering. Probably it helps you:

https://github.com/Antibrumm/jackson-antpathfilter

answered Aug 8, 2018 at 7:32

Martin Frey

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