unmarshalling nested objects from json

Question

I have incoming JSON strings and I need to unmarshall into JAXB annotated objects. I am using jettison to do this. JSON string looks like this:

{ 
  objectA :          


        

Answer 1

Note: I'm the EclipseLink JAXB (MOXy) lead and a member of the JAXB (JSR-222) expert group.

The JAXB mappings on your model appear to be correct. Below is sample code where I used your exact model as given in your questions with the JSON-binding available through EclipseLink MOXy:

Demo

package forum16365788;

import java.io.File;
import java.util.*;
import javax.xml.bind.*;
import org.eclipse.persistence.jaxb.JAXBContextProperties;

public class Demo {

    public static void main(String[] args) throws Exception {
        Map<String, Object> properties = new HashMap<String, Object>(1);
        properties.put(JAXBContextProperties.MEDIA_TYPE, "application/json");
        JAXBContext jc = JAXBContext.newInstance(new Class[] {ObjectA.class}, properties);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        File json = new File("src/forum16365788/input.json");
        ObjectA objectA = (ObjectA) unmarshaller.unmarshal(json);

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(objectA, System.out);
    }

}

input.json/Output

Below is the JSON I used. The keys objectA and objectB should be quoted, you don't have this in your question.

{
   "objectA" : {
      "propertyOne" : "some val",
      "propertyTwo" : "some other val",
      "objectB" : {
         "propertyA" : "some val",
         "propertyB" : true
      }
   }
}

For More Information

• http://blog.bdoughan.com/2011/08/json-binding-with-eclipselink-moxy.html
• http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html