CODEWITHSUNDEEP
javakotlinserializationjacksonmicronaut
Simone Pezzano
Simone Pezzano

Reputation: 197

Micronaut with Kotlin and Jackson's @JsonView annotation not working

I'm experimenting with Micronaut and Kotlin.

I have a Hibernate JPA connection and it works pretty well, however, while creating a REST API for it, I wanted to exclude some properties from the listing serialization.

Therefore, here's what I did:

Domain class:

@Entity
@JsonView
class User {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @NotNull
    @JsonView(View1::class)
    var id : Long? = null

    @NotNull
    @Column(unique = true, length = 64)
    @JsonView(View1::class)
    lateinit var email : String

    @NotNull
    @Column(length = 16)
    @JsonView(View2::class)
    lateinit var firstName : String

    @NotNull
    @Column(length = 16)
    @JsonView(View2::class)
    lateinit var lastName : String

    @NotNull
    @JsonView(View2::class)
    lateinit var address : Address

}

@Embeddable
class Address {

    @Column(length = 64)
    lateinit var street : String

    @Column(length = 32)
    lateinit var city : String

    @Column(length = 16)
    lateinit var state : String
}

View1 and View2 are not interesting, as they are literally empty classes as per the documentation.

Now, in the controller, I do something like:

    @Get("/")
    @Produces("application/json")
    @JsonView(View1::class)
    fun list() : List<User> {
        return userRepository.findAll()
    }

Expecting some cooperation, however, this is what I got:

[
    {
        "id": 1,
        "email": "[email protected]",
        "firstName": "John",
        "lastName": "Doe",
        "address": {
            "street": "23, Madison Street",
            "city": "Brooklyn",
            "state": "NY"
        }
    }
]

In the application.yml, json-view should be properly set as in:

jackson:
  json-view:
    enabled: true

Any clue?

Upvotes: 1

Views: 665

Answers (1)

user549136
user549136

Reputation: 31

After having the same problem I eventually stumbled onto this answer which was using the ObjectMapper directly: Jackson's @JsonView annotation does not work.

Problem was that the jackson.mapper.default-view-inclusion property has a default value of true. Explicitly setting it to false in application.yml solved the issue for me.

jackson:
  serializationInclusion: ALWAYS
  json-view:
    enabled: true
  mapper:
    default-view-inclusion: false

Upvotes: 1

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