In short, I would like to perform the unmarshalling as mentioned here but along with Map I will have one more @XmlElement. So one field is annotated with (Map field) @XmlPath(".") and another field with (String field) @XmlElement and then I would like to perform unmarshalling.
My main goal of the application is to convert XML->JSON and JSON->XML using the JAXB/Moxy and Jackson library. I am trying to unmarshal the XML and map it to the Java POJO. My XML can have some dedicated elements and some user-defined elements which can appear random so I would like to store them in Map<String, Object>. Hence, I am making use of XMLAdapter. I am following the blog article to do so. I am not doing exactly the same but a bit different.
The problem I am facing is during unmarshalling the dedicated fields are not taken into consideration at all. All the values are unmarshalled to Map<String.Object>. As per my understanding it's happening because of the annotation @XmlPath(".") and usage of XMLAdapter but If I remove this annotation then it won't work as expected. Can someone please help me with this issue? The marshaling works fine with both @XmlPath(".") and XMLAdapter. The problem is arising only during unmarshalling.
Following is my XML that I would like to convert to JSON: (Note: Name and Age are dedicated fields and others is the user-defined field.)
<Customer xmlns:google="https://google.com">
<name>BATMAN</name>
<age>2008</age>
<google:main>
<google:sub>bye</google:sub>
</google:main>
</Customer>
Following is my Customer class used for marshaling, unmarshalling by Moxy and Jackson: (Note: Name and Age are dedicated fields and others is the user-defined field. I want others to store only the values that cannot be mapped directly to POJO such as google:main and its children from above XML)
@XmlRootElement(name = "Customer")
@XmlType(name = "Customer", propOrder = {"name", "age", "others"})
@XmlAccessorType(XmlAccessType.FIELD)
public class Customer {
private String name;
private String age;
@XmlPath(".")
@XmlJavaTypeAdapter(TestAdapter.class)
private Map<String, Object> others;
//Getter, Setter and other constructors
}
Following is my TestAdapter class which will be used for the Userdefined fields:
class TestAdapter extends XmlAdapter<Wrapper, Map<String, Object>> {
@Override
public Map<String, Object> unmarshal(Wrapper value) throws Exception {
System.out.println("INSIDE UNMARSHALLING METHOD TEST");
final Map<String, Object> others = new HashMap<>();
for (Object obj : value.getElements()) {
final Element element = (Element) obj;
final NodeList children = element.getChildNodes();
//Check if its direct String value field or complex
if (children.getLength() == 1) {
others.put(element.getNodeName(), element.getTextContent());
} else {
List<Object> child = new ArrayList<>();
for (int i = 0; i < children.getLength(); i++) {
final Node n = children.item(i);
if (n.getNodeType() == Node.ELEMENT_NODE) {
Wrapper wrapper = new Wrapper();
List childElements = new ArrayList();
childElements.add(n);
wrapper.elements = childElements;
child.add(unmarshal(wrapper));
}
}
others.put(element.getNodeName(), child);
}
}
return others;
}
@Override
public Wrapper marshal(Map<String, Object> v) throws Exception {
Wrapper wrapper = new Wrapper();
List elements = new ArrayList();
for (Map.Entry<String, Object> property : v.entrySet()) {
if (property.getValue() instanceof Map) {
elements.add(new JAXBElement<Wrapper>(new QName(property.getKey()), Wrapper.class, marshal((Map) property.getValue())));
} else {
elements.add(new JAXBElement<String>(new QName(property.getKey()), String.class, property.getValue().toString()));
}
}
wrapper.elements = elements;
return wrapper;
}
}
@Getter
class Wrapper {
@XmlAnyElement
List elements;
}
And finally, my Main class will be used for marshaling and unmarshalling. Also, to convert to JSON and XML.
class Main {
public static void main(String[] args) throws JAXBException, XMLStreamException, JsonProcessingException {
//XML to JSON
JAXBContext jaxbContext = JAXBContext.newInstance(Customer.class);
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
InputStream inputStream = Main.class.getClassLoader().getResourceAsStream("Customer.xml");
final XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();
final XMLStreamReader streamReader = xmlInputFactory.createXMLStreamReader(inputStream);
final Customer customer = unmarshaller.unmarshal(streamReader, Customer.class).getValue();
final ObjectMapper objectMapper = new ObjectMapper();
final String jsonEvent = objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(customer);
System.out.println(jsonEvent);
//JSON to XML
Marshaller marshaller = jaxbContext.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
marshaller.marshal(customer, System.out);
}
}
When I convert the XML->JSON then I get the following output: (If you observe the fields name and age are not taken as the dedicated fields from Customer class rather its taken as random fields and written within the others)
{
"name" : "",
"age" : "",
"others" : {
"google:main" : [ {
"google:sub" : "bye"
} ],
"name" : "BATMAN",
"age" : "2008"
}
}
I want my output to be something like this: (I want my dedicated fields to be mapped first then if there are any unknown fields then map them later within others MAP). Please note that I do not want to get others tag within my JSON. I want to get the names of the fields only for the dedicated fields.
{
"name": "BATMAN",
"age": 2008,
"google:main": {
"google:sub": "bye"
}
}
Following is the XML that I would like to get during the marshaling. Also, please note I am using @XmlPath(".") so that I do not get the others node within my XML during marshaling.
<Customer>
<name>BATMAN</name>
<age>2008</age>
<google:main>>
<google:sub>bye</google:sub>
</google:main>
</Customer>
The marshaling is working fine. The problem is happening during .unmarshaling As per my understanding it's happening because of the annotation @XmlPath(".") with XMLAdapter but If I remove this annotation then it won't work as expected. Can someone please help me with this issue?
** Edited **
I thought of a few workarounds but nothing seems to work for me. They are getting messed up due to @XmlPath("."). Still looking for some idea or workarounds. Any help would be really appreciated.
Question&Answers:
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