Does not generate @XMLRootElement jaxb [duplicate]

Question

This is my .xsd file

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="Person" type="PersonType"/>
    <xs:complexType name="PersonType">

        <xs:sequence>
            <xs:element name="Name" type="xs:string"/>
            <xs:element name="Address" type="AddressType" minOccurs="1" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="AddressType">

        <xs:sequence>
            <xs:element name="Number" type="xs:unsignedInt"/>
            <xs:element name="Street" type="xs:string"/>
        </xs:sequence>
    </xs:complexType>

using this XSD file I Generated this class :

package demo5;

import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlType;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "PersonType", propOrder = {
  "name",
  "address"
})
public class PersonType {

@XmlElement(name = "Name", required = true)
protected String name;
@XmlElement(name = "Address", required = true)
protected List<AddressType> address;

public String getName() {
    return name;
}

public void setName(String value) {
    this.name = value;
}
public List<AddressType> getAddress() {
    if (address == null) {
        address = new ArrayList<AddressType>();
    }
    return this.address;
}

}

but XSD file does not generates the @XMLRootElement in the java file. any one can give a solution for this. I know can generate the root element but this does not work.

Answer 1

For global elements corresponding to named complex types an @XmlElementDecl annotation on the ObjectFactory class will be generated instead of an @XmlRootElement annotation on the class. This is because there may be more than one global element corresponding to the same named complex type. This use case could not be met by using @XmlRootElement.

@XmlRegistry
public class ObjectFactory {

    @XmlElementDecl(name="Person")
    public JAXBElement<PersonType> createPerson(PersonType personType) {
        return new JAXBElement<PersonType>(new QName("Person"), PersonType.class, personType);
    }

}

Creating the JAXBContext

When creating a JAXBContext based on a model generated from an XML Schema it should be done on the package name of the generated model. This is so the metadata in the ObjectFactory class gets processed.

JAXBContext jc = JAXBContext.newInstance("demo5");

Or the generated ObjectFactory class:

JAXBContext jc = JAXBContext.newInstance(demo5.ObjectFactory.class);

Unmarshalling the Class

When you unmarshal a class in which the root element corresponds to an @XmlElementDecl annotation you will get an instance of JAXBElement back.

JAXBElement<PersonType> je = (JAXBElement<PersonType>) unmarshaller.unmarshal(xml);
PersonType pt = je.getValue();

If you want to guard against a JAXBElement being returned you can always use the JAXBIntrospector on the result of the unmarshal operation:

PersonType pt = (PersonType) JAXBIntrospector.getValue(unmarshaller.unmarshal(xml));

For More Information

• http://blog.bdoughan.com/2012/07/jaxb-and-root-elements.html