Difference between revisions of "EclipseLink/Examples/MOXy/Spring/JAXBAnnotations"

Revision as of 14:07, 27 July 2010

In order to use EclipseLink JAXB with the Spring Framework, all that is required is a jaxb.properties file and eclipselink.jar (both of these files need to be on the classpath). No other special configuration is required. This example will demonstrate how to configure Spring to use EclipseLink JAXB.

Note that the latest version of EclipseLink can be found on the EclipseLink download page.

Configuration: applicationContext.xml

The following configuration file will be used to configure the beans used in this example:

<?xml version="1.0" encoding="UTF-8"?>
<beans 
    xmlns="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
    <bean id="jaxbMarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
        <property name="contextPath" value="example.gettingstarted"/>
    </bean>
    <bean id="xmlHelper" class="example.gettingstarted.XMLHelper">
        <property name="marshaller" ref="jaxbMarshaller"/>
    </bean>
</beans>

Two beans are being defined here:

• xmlHelper
  • This is the class that will do all of the work, i.e. marshal and unmarshal
• jaxbMarshaller
  • This is an instance of the org.springframework.oxm.jaxb.Jaxb2Marshaller class that will be injected into our xmlHelper
  • We use the "contexPath" property to indicate the location of the model classes, jaxb.properties, and ObjectFactory/jaxb.index

Following is the jaxb.properties file that tells Spring to use EclipseLink JAXB:

javax.xml.bind.context.factory = org.eclipse.persistence.jaxb.JAXBContextFactory

Spring supports both the JAXB 1.0 and the JAXB 2.0 API as XML marshalling strategies. EclipseLink JAXB implements JAXB 2, so for this example we will make use of the org.springframework.oxm.jaxb.Jaxb2Marshaller class.

XMLHelper

package example.gettingstarted;
 
import java.io.IOException;
 
import javax.xml.transform.Result;
import javax.xml.transform.Source;
 
import org.springframework.oxm.XmlMappingException;
import org.springframework.oxm.jaxb.Jaxb2Marshaller;
 
public class XMLHelper {
    private Jaxb2Marshaller marshaller;
 
    public Object load(Source source) throws XmlMappingException, IOException {
        return marshaller.unmarshal(source);
    }
 
    public void save(Object obj, Result result) throws XmlMappingException, IOException {
        marshaller.marshal(obj, result);
    }
 
    public void setMarshaller(Jaxb2Marshaller marshaller) {
        this.marshaller = marshaller;
    }
}