14.5 JAXB

14.5 JAXB
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The JAXB binding compiler translates a W3C XML Schema into one or more Java classes, a jaxb.properties file, and possibly some resource files. JAXB also offers a way to generate a schema from annotated Java classes.

Spring supports the JAXB 2.0 API as XML marshalling strategies, following the Marshaller and Unmarshaller interfaces described in Section 14.2, “Marshaller and Unmarshaller”. The corresponding integration classes reside in the org.springframework.oxm.jaxb package.

14.5.1 Jaxb2Marshaller

The Jaxb2Marshaller class implements both the Spring Marshaller and Unmarshallerinterface. It requires a context path to operate, which you can set using the contextPath property. The context path is a list of colon (:) separated Java package names that contain schema derived classes. It also offers a classesToBeBound property, which allows you to set an array of classes to be supported by the marshaller. Schema validation is performed by specifying one or more schema resource to the bean, like so:

<beans>

    <bean id="jaxb2Marshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
        <property name="classesToBeBound">
            <list>
                <value>org.springframework.oxm.jaxb.Flight</value>
                <value>org.springframework.oxm.jaxb.Flights</value>                
            </list>
        </property>
        <property name="schema" value="classpath:org/springframework/oxm/schema.xsd"/>
    </bean>
    ...

</beans>

14.5.1.1 XML Schema-based Configuration

The jaxb2-marshaller tag configures a org.springframework.oxm.jaxb.Jaxb2Marshaller. Here is an example:

<oxm:jaxb2-marshaller id="marshaller" contextPath="org.springframework.ws.samples.airline.schema"/>

Alternatively, the list of classes to bind can be provided to the marshaller via the class-to-be-bound child tag:

<oxm:jaxb2-marshaller id="marshaller">
    <oxm:class-to-be-bound name="org.springframework.ws.samples.airline.schema.Airport"/>
    <oxm:class-to-be-bound name="org.springframework.ws.samples.airline.schema.Flight"/>
    ...
</oxm:jaxb2-marshaller>

Available attributes are:

Attribute	Description	Required
`id`	the id of the marshaller	no
`contextPath`	the JAXB Context path	no

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