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deserialize xml to pojo using jackson xml mapper

I am using Jackson XML mapper to deserialize XML to POJO. The XML looks like

<person>
<agency>
<phone>111-111-1111</phone>
</agency>
</person>


And my class looks like

class Person

@JacksonXmlProperty(localName="agency", namespace="namespace")
private Agency agency;
//getter and setter

class Agency

@JacksonXmlElementWrapper(useWrapping = false)
@JacksonXmlProperty(localName="phone", namespace="namespace")
private List<AgencyPhone> phones;
//getter and setter

class AgencyPhone

private Phone phone;
//getter and setter

class Phone

private String number;
//getter and setter



I want to set the phone number to number in Phone class. I cannot change XML or the way the class has been structured. I am getting Cannot construct instance of resolved.agency.AgencyPhone error and I created a AgencyPhone constructor

resolved.agency.AgencyPhone

class AgencyPhone{

private Phone phone;
public AgencyPhone(Phone phone)

this.phone = phone;




But that did not work. So how to deserialize to nested instances.

1 Answer
1

You can write your own custom deserialiser to achieve this. Here is the code to get you started:

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;
import java.io.IOException;

public class Test
public static void main(String args) throws JsonParseException, JsonMappingException, IOException
XmlMapper mapper = new XmlMapper();
final SimpleModule module = new SimpleModule("configModule", com.fasterxml.jackson.core.Version.unknownVersion());
module.addDeserializer(Person.class, new DeSerializer());
mapper.registerModule(module);
// Person readValue = mapper.readValue(<xml source>);



class DeSerializer extends StdDeserializer<Person>

protected DeSerializer()
super(Person.class);


@Override
public Person deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException
// use p.getText() and p.nextToken to navigate through the xml and construct Person object
return new Person();





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