I am using JAXB 2.0. I have various elements and types defined in an XSD file. Here's an example:
<xs:element name="Person" type="Person" /> <xs:complexType name="Person"> <xs:attribute name="name" type="xs:string"/> </xs:complexType> <xs:element name="Musician" type="Musician"/> <xs:complexType name="Musician"> <xs:complexContent> <xs:extension base="Person"> <xs:attribute name="instrument" type="xs:string"/> </xs:extension> </xs:complexContent> </xs:complexType> <xs:element name="People" type="People"/> <xs:complexType name="People"> <xs:sequence> <xs:element name="person" type="Person" minOccurs="0" maxOccurs="Unbounded/> </xs:sequence> </xs:complexType>
So as you can see from the above schema example, we have a Person, who has a name, and a Musician, who is also a Person (though this may be subject to some debate, but that's for another forum). There is also a People element, which is essentially a collection of Person types.
I have the following in a bindings file:
<?xml version="1.0" encoding="UTF-8"?> <jaxb:bindings xmlns:jaxb="http://java.sun.com/xml/ns/jaxb" jaxb:version="2.0" xmlns:xjc= "http://java.sun.com/xml/ns/jaxb/xjc" jaxb:extensionBindingPrefixes="xjc"> <jaxb:globalBindings optionalProperty="wrapper"> <xjc:simple/> </jaxb:globalBindings>
My intended use of these objects is:
- A Person may appear as a solitary Marshalled element, or may be a part of a People object
- If a Person is part of a People object, then the xsi:type should indicate whether it's just a normal Person or a Musician.
So I need the generated Java classes to contain both an @XmlRootElement annotation as well as an @XmlType annotation. The xjc:simple binding creates both annotations for a Musician, but only creates the @XmlType for Person. So when I Marshall a Person object, all I get is:
<?xml version="1.0" encoding="UTF-8"?>
Whereas what I would like to see is:
<?xml version="1.0" encoding="UTF-8"?> <Person name="John Doe"/>
For a People object, I want to see:
<?xml version="1.0" encoding="UTF-8"?> <People> <person name="John Doe" xsi:type="Person"/> <person name="Keith Richards" xsi:type="Musician"/> </People>
I have read about the simple binding with xjc, and it works with all the lowest levels in an inheritance hierarchy. However, the base classes end up without an @XmlRootElement annotation. For the use case I'm working on, it's imperative that base classes can be Marshalled as both a top-level element and as a member of other elements. Any suggestions would be welcome.