Weird XmlMixed XML <-> JAXB <-> JSON marshalling/unmarshalling with MOXy - jaxb

Question

I have following type, defined in schema as:
<xsd:complexType name="any_t" mixed="true">
<xsd:sequence>
<xsd:any processContents="lax" minOccurs="0" maxOccurs="unbounded"></xsd:any>
</xsd:sequence>
</xsd:complexType>
Generated JAXB class:
#XmlAccessorType(XmlAccessType.FIELD)
#XmlType(name = "any_t", propOrder = {
"content"
})
public class AnyT implements Serializable
{
private final static long serialVersionUID = 1L;
#XmlMixed
#XmlAnyElement(lax = true)
protected List<Object> content;
public List<Object> getContent() {
if (content == null) {
content = new ArrayList<Object>();
}
return this.content;
}
}
Some JAXB class that uses this type:
#XmlAccessorType(XmlAccessType.FIELD)
#XmlType(name = "", propOrder = {
"addInfo"
})
#XmlRootElement(name = "FORM_OF_COOWNERS")
public class FormOfCoowners
implements Serializable
{
private final static long serialVersionUID = 1L;
#XmlElement(name = "add_info")
protected AnyT addInfo;
public AnyT getAddInfo() { return addInfo; }
public void setAddInfo(AnyT value) { this.addInfo = value; }
}
When I unmarshall this XML to JAXB object:
<FORM_OF_COOWNERS>
<add_info>
<info_analytics>
<issuer_subdiv>
<id><id>1940001</id></id>
</issuer_subdiv>
<fl_worker>Yes</fl_worker>
</info_analytics>
</add_info>
</FORM_OF_COOWNERS>
and marshall this object to JSON, I get:
{"FORM_OF_COOWNERS":{"add_info":{"info_analytics":[{"issuer_subdiv":{"id":{"id":"1940001"}},"fl_worker":"Yes"}]}}}
where does this list came from? info_analytics maps to a type without any collections/arrays.
If I get this JSON, umarshall it to JAXB object and marshall to XML, it produces:
<info_analytics fl_worker="Yes">
<issuer_subdiv>
<id id="1940001">
<id>1940001</id>
</id>
</issuer_subdiv>
<fl_worker>Yes</fl_worker>
</info_analytics>
why elements are duplicated as attributes?
UPDATE: marshalling/unmarshalling to/from json:
def unmarshallToJaxbTyped[A : ClassTag](json: String): Throwable \/ A =
\/.fromTryCatchNonFatal {
val cls = classTag[A].runtimeClass
val jc = JAXBContext.newInstance(cls)
val unmarshaller = jc.createUnmarshaller()
unmarshaller.setProperty("eclipselink.media-type", "application/json")
unmarshaller.unmarshal(new StreamSource(new StringReader(json)), cls)
.getValue.asInstanceOf[A]
}
def marshallJaxbToJson(obj: Any): Throwable \/ String =
\/.fromTryCatchNonFatal {
val jc = JAXBContext.newInstance(obj.getClass)
val marshaller = jc.createMarshaller()
marshaller.setProperty("eclipselink.media-type", "application/json")
val writer = new StringWriter()
marshaller.marshal(obj, writer)
writer.getBuffer.toString
}
xml:
protected static synchronized JAXBContext getContext() {
if (jaxbContext == null)
try {
jaxbContext = JAXBContext.newInstance("org.example.models");
} catch (JAXBException ex) {
throw new RuntimeException(ex);
}
return jaxbContext;
}
public static void saveMessage(Object msg, OutputStream os) throws JAXBException {
Marshaller marshaller = getContext().createMarshaller();
marshaller.marshal(msg, os);
}
public static Object loadMessage(InputStream is) throws JAXBException {
Unmarshaller unmarshaller = getContext().createUnmarshaller();
return unmarshaller.unmarshal(is);
}

Answer 1

I'm not sure how ofter such weird roundtrip: XML -> Java -> JSON -> Java -> XML is needed. I think you understand, that XML supports much more features than JSON and that's why it's not always possible to have 1 to 1 mapping.
If this is a real problem for you and not only theoretical investigations please fire a bug against MOXy: https://bugs.eclipse.org/bugs/enter_bug.cgi?product=EclipseLink