Kotlin

[davidmoshal]

Starting a discussion on Kotlin, just to save anyone a few hours figuring out these magical incantations.

Magical incantation 1:

Deserializing classes that don't have an empty constructor

eg:

class Doctor(var name: String)

Solution:

import com.fasterxml.jackson.databind.DeserializationFeature
import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper

val store: IDocumentStore = DocumentStore("http://<url>", "<database>").apply {
    conventions.apply {
        entityMapper = jacksonObjectMapper().apply {
            configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
        }
    }
    initialize()

FAIL_ON_UNKNOWN_PROPERTIES needs to be suppressed for the @metadata document property.
Note: conventions.SetEntityManager appears to be undocumented (ie: not documented on the RavenDB site).

Magical Incantation 2:

Getting deserialization to work in Enterprise Java CDI containers (eg Quarkus).

For some reason the internal Class.forName(name) fails in CDI containers, but if supplied via a configuration setting, seems to work:

setFindJavaClassByName { name -> Class.forName(name) }

So, the whole enchilada is:

    val store: IDocumentStore = DocumentStore("http://localhost:8083", "test-db").apply {
        conventions.apply {
            setFindJavaClassByName { name -> Class.forName(name) }
            entityMapper = jacksonObjectMapper().apply {
                configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
            }
        }
        initialize()
    }

Anyone else have magical incantations for Kotlin+RavenDB?