How to validate against schema in JAXB 2.0 without marshalling?

Question

I need to validate my JAXB objects before marshalling to an XML file. Prior to JAXB 2.0, one could use a javax.xml.bind.Validator. But that has been deprecated so I\'m try

Answer 1

This how we did it. I had to find a way to validate the xml file versus an xsd corresponding to the version of the xml since we have many apps using different versions of the xml content.

I didn't really find any good examples on the net and finally finished with this. Hope this will help.

ValidationEventCollector vec = new ValidationEventCollector();

SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);

URL xsdURL = getClass().getResource("/xsd/" + xsd);
Schema schema = sf.newSchema(xsdURL);

//You should change your jaxbContext here for your stuff....
Unmarshaller um = (getJAXBContext(NotificationReponseEnum.NOTIFICATION, notificationWrapper.getEnteteNotification().getTypeNotification()))
    .createUnmarshaller();
um.setSchema(schema);

try {
    StringReader reader = new StringReader(xml);
    um.setEventHandler(vec);
    um.unmarshal(reader);
} catch (javax.xml.bind.UnmarshalException ex) {
    if (vec != null && vec.hasEvents()) {
        erreurs = new ArrayList < MessageErreur > ();
        for (ValidationEvent ve: vec.getEvents()) {
            MessageErreur erreur = new MessageErreur();
            String msg = ve.getMessage();
            ValidationEventLocator vel = ve.getLocator();
            int numLigne = vel.getLineNumber();
            int numColonne = vel.getColumnNumber();
            erreur.setMessage(msg);
            msgErreur.setCode(ve.getSeverity())
            erreur.setException(ve.getLinkedException());
            erreur.setPosition(numLigne, numColonne);
            erreurs.add(erreur);

            logger.debug("Erreur de validation xml" + "erreur : " + numLigne + "." + numColonne + ": " + msg);
        }
    }
}