How do I get Groovy and JAXB to play nice together

groovy, java, jaxb

Solution

Uncommenting 1 and 4 is the correct way to set JAXB up with Groovy. The reason it is not working is that each Groovy Class has a metaClass property on it. JAXB is trying to expose this as a JAXB property which obviously fails. Since you don't declare the metaClass property yourself, it is not possible to annotate it to have JAXB ignore it. Instead you and set the XmlAccessType to NONE. This disable's JAXB's auto-discovery of properties to expose as XML elements. After you do that, you need to explicitly declare any fields you want exposed.

Example:

@XmlAccessorType( XmlAccessType.NONE )
@XmlRootElement
public class PlayerGroovy {
    @XmlAttribute
    String value
}

Problem

I am trying to get JAXB to work with a groovy class of mine, however, it appears it doesn't work but the java version does. Here is the code... Here are the Scenarios: If 2 and 3 are uncommented it works fine. If 1 and 4 are uncommented I get: ``` com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions groovy.lang.MetaClass is an interface, and JAXB can't handle interfaces. ``` If 1 and 5 are uncommented I get: ``` javax.xml.bind.JAXBException: class org.oclc.presentations.simplejaxb.PlayerGroovy nor any of its super class is known to this context. ``` Any ideas? Java: ``` import javax.xml.bind.annotation.XmlRootElement; @XmlRootElement public class Player { } ``` Groovy: ``` import javax.xml.bind.annotation.XmlRootElement @XmlRootElement public class PlayerGroovy { } ``` Test: ``` import org.junit.Test import javax.xml.bind.JAXBContext import javax.xml.bind.Marshaller import org.junit.Assert class PlayerTest { @Test public void testJaXB(){ //1 PlayerGroovy player = new PlayerGroovy() //2 Player player = new Player() StringWriter writer = new StringWriter(); //3 JAXBContext context = JAXBContext.newInstance(Player.class); //4 JAXBContext context = JAXBContext.newInstance(PlayerGroovy.class); //5 JAXBContext context = JAXBContext.newInstance(PlayerGroovy.getClass()); Marshaller m = context.createMarshaller(); m.marshal(player, writer); println(writer) Assert.assertTrue(true) } } ```

Original source