I have found some examples of JAXB2 @XmlRegistry over the internet but no good in-depth tutorials that talk about the concept of using @XmlRegistry with @XmlElementDecl, wonder if its a concept not much explored in general.
Anyways here is my question, first some sample classes that I am using to unmarshall an xml using JAXB:
The main class I am trying to unmarshal using JAXB - Employee.java
package com.test.jaxb;
import java.util.List;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.annotation.XmlElementDecl;
import javax.xml.bind.annotation.XmlRegistry;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.namespace.QName;
import com.test.jaxb.dto.Address;
@XmlRootElement
public class Employee {
private int id;
private String name;
private String email;
private List<Address> addresses;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public List<Address> getAddresses() {
return addresses;
}
public void setAddresses(List<Address> addresses) {
this.addresses = addresses;
}
@SuppressWarnings("unused")
@XmlRegistry
public static class XMLObjectFactory {
@XmlElementDecl(scope = Employee.class, name= "id")
JAXBElement<String> createEmployeeId(String value) {
return new JAXBElement<String>(new QName("id"), String.class, "100");
}
@XmlElementDecl(scope = Employee.class, name= "name")
JAXBElement<String> createName(String value) {
return new JAXBElement<String>(new QName("name"), String.class, "Fake Name");
}
@XmlElementDecl(scope = Employee.class, name= "email")
JAXBElement<String> createEmail(String value) {
return new JAXBElement<String>(new QName("email"), String.class, value);
}
@XmlElementDecl(scope = Employee.class, name= "addresses")
JAXBElement<List> createAddresses(List value) {
return new JAXBElement<List>(new QName("addresses"), List.class, value);
}
}
}
The child class - Address.java
package com.test.jaxb.dto;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.annotation.XmlElementDecl;
import javax.xml.bind.annotation.XmlRegistry;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.namespace.QName;
import com.test.jaxb.Employee;
@XmlRootElement
public class Address {
private String addressLine1;
private String addressLine2;
private String addressLine3;
public String getAddressLine1() {
return addressLine1;
}
public void setAddressLine1(String addressLine1) {
this.addressLine1 = addressLine1;
}
public String getAddressLine2() {
return addressLine2;
}
public void setAddressLine2(String addressLine2) {
this.addressLine2 = addressLine2;
}
public String getAddressLine3() {
return addressLine3;
}
public void setAddressLine3(String addressLine3) {
this.addressLine3 = addressLine3;
}
@SuppressWarnings("unused")
@XmlRegistry
private static class XMLObjectFactory {
@XmlElementDecl(scope = Employee.class, name= "addressLine1")
JAXBElement<String> createAddressLine1(String value) {
return new JAXBElement<String>(new QName("addressLine1"), String.class, value);
}
@XmlElementDecl(scope = Employee.class, name= "addressLine2")
JAXBElement<String> createAddressLine2(String value) {
return new JAXBElement<String>(new QName("addressLine2"), String.class, value);
}
@XmlElementDecl(scope = Employee.class, name= "addressLine3")
JAXBElement<String> createAddressLine3(String value) {
return new JAXBElement<String>(new QName("addressLine3"), String.class, value);
}
}
}
The xml to be unmarshalled - employee.xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<employee>
<id>1</id>
<name>Vaishali</name>
<email>[email protected]</email>
<addresses>
<address>
<addressLine1>300</addressLine1>
<addressLine2>Mumbai</addressLine2>
<addressLine3>India</addressLine3>
</address>
<address>
<addressLine1>301</addressLine1>
<addressLine2>Pune</addressLine2>
<addressLine3>India</addressLine3>
</address>
</addresses>
</employee>
Unmarshalling Code :
package com.test.jaxb;
import java.io.FileReader;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
public class ObjectFactoryTest {
public static void main(String[] args) throws Exception {
FileReader reader = new FileReader("resources/employee.xml");
JAXBContext context = JAXBContext.newInstance(Employee.class);
Unmarshaller unmarshaller = context.createUnmarshaller();
Object obj = unmarshaller.unmarshal(reader);
System.out.println(obj);
}
}
When I unmarshal the employee xml using above code, the address list does not get populated. The resulting employee object only has a blank list of adresses. Is there anything wrong with my mappings?
To find out what is going on and see if the employee objects are actually being created using the Object Factory (having the @XMLRegistry annotation), I changed the value of id and name in factory methods, however that had no effect in the output, which tells me JAXB is not actually using the ObjectFactory, why?
Am I going aboout this all wrong? Any help would be appreciated.