Using JAXB in Scala to serialize to XML - scala

Question

I wrote this code in Scala to use jaxb to serialize Scala objects to XML (don't want to use Scala native xml capability).
#XmlRootElement(name = "SESSION")
#XmlAccessorType(XmlAccessType.FIELD)
case class Session(
#XmlAttribute(name="TYPE")
sessionType: String
) {
def this() = this("")
}
#XmlRootElement(name = "FOO-BAR")
#XmlAccessorType(XmlAccessType.FIELD)
case class FooBar(
#XmlElement
session: Session
) {
def this() = this(new Session())
}
object JAXBTest extends App {
val context = JAXBContext.newInstance(classOf[FooBar])
val fooBar = FooBar(Session("mysession"))
val stringWriter = new StringWriter()
val marshaller = context.createMarshaller()
marshaller.marshal(hHonors, stringWriter)
println(stringWriter.toString)
}
The produced XML looks like
<FOO-BAR><session><sessionType>mysession</sessionType></session></FOO-BAR>
But the XML I want is
<FOO-BAR><SESSION TYPE="mysession"></SESSION></FOO-BAR>

Answer 1

You'll have to use scala type to redefine annotations and use them.
See code below and notice the case senstivity used.
An other point is for the Session, the name of the XmlElement is on the field in FooBar and not on the class
import io.github.javathought.commons.xml.Macros.{xmlAccessorType, xmlRootElement, xmlAttribute, xmlElement}
import scala.annotation.meta.field
object Macros {
type xmlRootElement = XmlRootElement #companionClass
type xmlAccessorType = XmlAccessorType #companionClass
type xmlElement = XmlElement #field
type xmlAttribute = XmlAttribute #field
}
#xmlAccessorType(XmlAccessType.FIELD)
case class Session(
#xmlAttribute(name="TYPE")
sessionType: String
) {
def this() = this("")
}
#xmlRootElement(name = "FOO-BAR")
#xmlAccessorType(XmlAccessType.FIELD)
case class FooBar(
#xmlElement(name = "SESSION")
session: Session
) {
def this() = this(new Session())
}
val hHonors = new FooBar(new Session("Hi"))
val context = JAXBContext.newInstance(classOf[FooBar])
val fooBar = FooBar(Session("mysession"))
val stringWriter = new StringWriter()
val marshaller = context.createMarshaller()
marshaller.marshal(hHonors, stringWriter)
println(stringWriter.toString)
I get the expected string :
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><FOO-BAR><SESSION TYPE="Hi"/></FOO-BAR>