JAXB 2.x : Marshalling puts element value twice into the XML

Question

For some reason, all values of an element gets written twice. My test case is very simple:

package test;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlAccessorType(XmlAccessType.NONE)
@XmlRootElement(name="root")
public class TestBean {

    private String name = null;

    @XmlElement(name="lastname")
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }


}

Then I marshall the document to the filesystem into an XML:

    TestBean object = new TestBean();
    object.setName("abc ");
    Class<?> clazz = object.getClass();
    JAXBContext context = JAXBContext.newInstance(clazz);
    Marshaller m = context.createMarshaller();
    m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE );
    m.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
    m.marshal(object, new File("test.xml"));

And the resulting XML is:

<?xml version="1.0" encoding="UTF-8"?>
<root>
   <lastname>abc abc </lastname>
</root>

For simplicity I removed the package-info.java file with the namespace definitions.

The implementation I am using is org.eclipse.persistence.moxy 2.1.2: the jaxb.properties file in the package folder contains this line:

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

Thanks for any hints.

Answer 1

This is a known MOXy issue that has been fixed in the EclipseLink 2.3.0 stream. An EclipseLink 2.3.0 download can be obtained here:

• http://www.eclipse.org/eclipselink/downloads/nightly.php

The workaround for EclipseLink 2.1.2 is to use another access type, or to annotate the corresponding field with @XmlTransient:

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlTransient;

@XmlAccessorType(XmlAccessType.NONE)
@XmlRootElement(name="root")
public class TestBean {

    @XmlTransient
    private String name = null;

    @XmlElement(name="lastname")
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}

Answer 2

I tried your test and it gives the correct output for me:

<root>
    <lastname>abc </lastname>
</root>

It could be the JAXB2 implementation (moxy in your case vs native JDK1.6 based JAXB2 for my test).