Deserializing xml namespaces with Jackson & Kotlin

Question

I have a xml element with 2 namespaces, and I'm not able to read them with jackson.

<Person xmlns="http://some.namespace.com" xmlns:ns0="http://some.other.namespace.com">
    <name>John</name>
</Person>

internal data class Person(
    val name: String,
    @get:JacksonXmlProperty(isAttribute = true)
    val xmlns: String,
    @get:JacksonXmlProperty(isAttribute = true, localName="xmlns:ns0")
    val ns0: String
)

When reading the XML with jackson, I get an error saying that both namespaces should be nullable.

I've tried with some variants like attrs in the body of the class and with the namespace attribute, like

    @JacksonXmlProperty(isAttribute = true, localName = "ns0", namespace = "xmlns")
    var ns0: String? = null

This is the mapper I'm using

val mapper: XmlMapper = XmlMapper().apply {
        registerModule(KotlinModule())
        setSerializationInclusion(JsonInclude.Include.NON_NULL)
    }

How can I read and write again this xml and make them identical?

Answer 1

I solved my problem setting a property to the XMLInputFactory like this:

val inputFactory = XMLInputFactory.newFactory()
inputFactory.setProperty(XMLInputFactory.IS_NAMESPACE_AWARE, false)
XmlMapper(inputFactory).apply {
   registerModule(KotlinModule())
}

In this case you can model all the namespaces and do what you want. Case solved.