@JsonIgnoreProperties not working with lazy loaded objects

[walfrat]

Hello,

I'm using JsonIgnoreProperties to prevent some fields to get serialized on my getters method, it works for eagerly loaded objects but not for lazy loaded objects.

I upgraded to the latest version of jackon (2.6.3) and same for datatype-hibernate and moved the @JsonIgnoreProperties from the getter to the fields and adding the allowSetters = true but i still get the problem.

I didn't check for all @To but at the moment i can confirm that it doesn't work for lazy ManyToOne relation. But i don't end up with a cyclic conflict.

Exemple : i have a class A which have a eagerly loaded list of B elements. B has lazy loaded A element. Each have a JsonIgnoreProperties which exclude the other one to be serialized

For one special case i query directly B elements and want to lazy-load A. The JSOn end up with A being full serialized in B but B elements in A don't serialize A again.

Then i end up with the following JSON

[{
_type:"B";
a:{
_type:"A"
b:[{
_type:"B"
/* no a element */
}, ...],
[...]
}]
}
}]

Exemple of Code for A/B :
class A{
@JsonIgnoreProperties({"a"}, allowSetters=true)
@onetomany(fetch=FetchType.EAGER)
Set b;
}
class B{
@JsonIgnoreProperties({"b"}, allowSetters=true)
@manytoone(fetch=FetchType.LAZY)
A a;

}

Environment :

• Hibernate 4
• CXF 3+ - JaxRS (using JackonJsonProvider and Jax-RS annotation)
• Spring 4+

[cowtowncoder]

Actually, I suspect this may be same as #70, as @JsonIgnoreProperties is not designed to work for Collection (or array) types. This is a limitation of jackson-databind, although I can see why it would be great if it could be made to work. So I filed a feature request:

FasterXML/jackson-databind#1060

so that perhaps such improvement could be added.

EDIT: as of October 2018, above-mentioned issue 1060 has been implemented so this feature DOES work for non-Hibernate Collections.

[walfrat]

Nop i can reproduce the issue with a user -> manager relationship (many to one, optional).

Here's is a github sample project

https://github.com/walfrat/jackson-ignore-properties-lazy-objects

Some explanation are required :

I have a weird test classes with one init method that is annotated @test : to setup the data in another transaction (@before is in the same transaction).

So to test the thing you have to run the whole class (and init has to get called before the other testSerialize).

The result :

{"id":12,"name":"user","address":"address","manager{"id":27,"name":"user","address":"address","manager":{"id":25,"name":"manager","address":"ADDRESS THAT SHOULD NOT BE SHOWN","manager":null,"anotherManager":null},"anotherManager":{"id":26,"name":"eager manager","manager":null,"anotherManager":null}}

With an ignore properties on address fields for both of manager and anotherManager fields

In my project i have the problems with some no-optional relations that has the same problem too.

[walfrat]

can't edit : the result is

{"id":27,"name":"user","address":"address","manager":{"id":25,"name":"manager","address":"ADDRESS THAT SHOULD NOT BE SHOWN","manager":null,"anotherManager":null},"anotherManager":{"id":26,"name":"eager manager","manager":null,"anotherManager":null}
}

[cowtowncoder]

I wonder if part of the issue could be due to #81, which I just fixed?

Or... actually, more likely, one of remaining issues with Proxy handling.
Proxy access is needed to force eager loading (or rather avoid it, to preserve lazy loading); and current handler does not retain all necessary information.

[walfrat]

Nop still the same after upgrade to 2.7.0-rc3.

I don't think it could be related to TypeErasure since the problem can
happen on a non-collection field (Lazy Many-To-One)

2016-01-05 19:03 GMT+01:00 Tatu Saloranta [email protected]:

I wonder if part of the issue could be due to #81
#81,
which I just fixed?

—
Reply to this email directly or view it on GitHub
#78 (comment)
.

[cowtowncoder]

@walfrat Thank you for verifying this. Fix would likely then require complete rehaul of proxy handling, something that should be done, but won't be done before 2.8.

[walfrat]

Any news about this ?

[nakamorichi]

Still no fix on sight?

[cowtowncoder]

At this point there will only be a fix if someone contributes a fix. I do not use Hibernate and am not familiar with its implementation details regarding Proxy handling. So it would be up to someone with more Hibernate knowledge; I can help with Jackson/Collection handling side if necessary.