Castor and JAXB Marshaller

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+1 Q:

Castor and JAXB Marshaller

Currently I am using Castor framework to marshall the object into xml file it work greats

Writer writer = new FileWriter("D:/out.xml");
Marshaller.marshal(test, writer);

But now I am using javax.xml.bind to do the same thing.

            Writer writer = new FileWriter("D:/out.xml");
        JAXBContext context =
            JAXBContext.newInstance(test.getClass());
        Marshaller marshaller = context.createMarshaller();
        marshaller.marshal(test, writer);

Then I hits this error message :

unable to marshal type "package1.Testing" as an element because it is missing an @XmlRootElement annotation]

+2 A:

Add the XmlRootElement annotation and you won't get the error anymore. This should be added to the top-level or "root" class.

Taylor Leese 2010-01-12 02:29:43

Thanks for your answer can you roughly explain to me why using castor is okay but jaxb need to add in XmlRootElement

2010-01-12 02:32:46

It's just semantics. The Castor and JAXB API's are different and JAXB requires the annotation whereas Castor doesn't.

Taylor Leese 2010-01-12 02:38:30

Does it mean JAXB need to know which class to look at so in my Testing file i have to put in @XmlRootElement?

2010-01-12 02:41:03

The class that is "test" is your example should have @XmlRootElement.

Taylor Leese 2010-01-12 02:43:12

I know to add in the @XmlRootElement just want to know the reason why need to add in. Thanks for your answer I solved the problem

2010-01-12 03:07:06

The reason is because that's how JAXB figures out name of root element. This is only needed for root element since properties use field/getter/setter name to determine element name; but this is not available for root. I guess Castor defaults to using class name or soemthing else, but JAXB requires explicit definition.

StaxMan 2010-02-08 01:55:09

ansaurus

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Castor and JAXB Marshaller

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