Pfthb

When trying to implement a SOAP service in Spring, I've run into interesting issue, when dealing with XSD and unmarshalling. Given following XSD file and jaxb2 maven plugin (version 2.4)

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema"
 xmlns:c="http://foo.bar/car"
 targetNamespace="http://foo.bar/car"
 elementFormDefault="qualified">

 <element name="car">
 <complexType>
 <sequence>
 <element name="engine" type="c:engine"/>
 </sequence>
 </complexType>
 </element>

 <complexType name="engine">
 <sequence>
 <element name="type" type="string"/>
 <element name="cylinder" type="positiveInteger"/>
 <element name="attributes" type="c:attributes"/>
 </sequence>
 </complexType>

 <complexType name="attributes">
 <sequence>
 <element name="attribute" minOccurs="0" maxOccurs="unbounded">
 <complexType>
 <sequence>
 <element name="name" type="string"/>
 <element name="value" type="string"/>
 </sequence>
 </complexType>
 </element>
 </sequence>
 </complexType>

</schema>

I'm trying to unmarshall following xml

<?xml version="1.0" encoding="UTF-8" ?>
<c:car xmlns:c="http://foo.bar/car">
 <c:engine>
 <type>Big Block</type>
 <cylinder>4</cylinder>
 <attributes>
 <attribute>
 <name>ccu</name>
 <value>469</value>
 </attribute>
 <attribute>
 <name>ps</name>
 <value>500</value>
 </attribute>
 </attributes>
 </c:engine>
</c:car>

Actually, I'd expect the fields type, cylinder and attributes not to be populates, as those are defined without a namespace. But the object attributes are populated and only name and value properties within "attribute" are remaining null.

JAXBContext jaxbContext = JAXBContext.newInstance(Car.class);
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
Car car = (Car)jaxbUnmarshaller.unmarshal(new File("cars.xml"));

Could somebody explain this behavior, as I'm not able to find a reasonable explanation for it?

Thanks in advance.