I was going through the Blaise's Blog http://blog.bdoughan.com/2010/11/jaxb-and-inheritance-using-substitution.html for Jaxb Inheritance using Substitution.
I want to implement the same but not to the root element. I am looking this type of XML as a output.
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<configuration>
<customer>
<address>
<street>1 A Street</street>
</address>
<address>
<street>2 B Street</street>
</address>
<phoneNumber>
<mobileNo>xxx-xxx-xxxx</mobileNo>
</phoneNumber>
</customer>
</configuration>
Following is the Configuration.java
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
public class Configuration {
private Customer customer;
public Customer getCustomer() {
return customer;
}
public void setCustomer(Customer customer) {
this.customer = customer;
}
@Override
public String toString() {
return "\n Customer[ customer="+customer+"]";
}
}
Customer.java
public class Customer {
private List<ContactInfo> contactInfo;
@XmlElementRef
public List<ContactInfo> getContactInfo() {
return contactInfo;
}
public void setContactInfo(List<ContactInfo> contactInfo) {
this.contactInfo = contactInfo;
}
}
Address.java
public class Address extends ContactInfo {
private String street;
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
}
PhoneNumber.java
public class PhoneNumber extends ContactInfo{
private String mobileNo;
public String getMobileNo() {
return mobileNo;
}
public void setMobileNo(String mobileNo) {
this.mobileNo = mobileNo;
}
}
Demo.java
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
public class Demo {
public static void main(String[] args) throws Exception {
Configuration configuration = new Configuration();
Customer customer = new Customer();
List<ContactInfo> contacts = new ArrayList<ContactInfo>();
Address address = new Address();
address.setStreet("1 A Street");
contacts.add(address);
Address address1 = new Address();
address1.setStreet("2 B Street");
contacts.add(address1);
PhoneNumber phone = new PhoneNumber();
phone.setMobileNo("408 431 8829");
contacts.add(phone);
customer.setContactInfo(contacts);
configuration.setCustomer(customer);
JAXBContext jc = JAXBContext.newInstance(Configuration.class);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(configuration, System.out);
}
}
Presently I am getting following Exception
Exception in thread "main" com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions
Invalid @XmlElementRef : Type "class Address" or any of its subclasses are not known to this context.
Could anybody help me out on this?
Thanks, Kwatra
Issue #1 - The Subclasses
A JAXB (JSR-222) implementation can not auto discover subclasses. You can solve the first exception by using an @XmlSeeAlso
annotation on the ContactInfo
class to reference the subclasses:
@XmlSeeAlso({Address.class, PhoneNumber.class})
public class ContactInfo {
}
Or you can reference them when you create the JAXBContext
.
JAXBContext jc = JAXBContext.newInstance(Configuration.class, Address.class, PhoneNumber.class);
Issue #2 - The Mapping
When using @XmlElementRef
you need to pair it with @XmlRootElement
. If you don't want to go this route you could use @XmlElements
instead.
@XmlElements({
@XmlElement(name="address", type=Address.class),
@XmlElement(name="phoneNumber", type=PhoneNumber.class)
})
public List<ContactInfo> getContactInfo() {
return contactInfo;
}
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