JAXB 2 validation?

Question

Hi,
Just right now I installed JAXB 2.0.
Although the Java Web Services Tutorial for JWSDP v2.0 p33
mentions a "Unmarshal Validate Example", this is
not included in the samples dir anymore.
Furthermore the Validator interface as well as
the JAXBContext.setValidating() function is depricated.
Calling this function anyway yields an exception ("not supported").
How can I do validation in JAXB 2.0?
Have fun,
Klaus

Answer 1

I ran into the same thing, and it seems they refactored the validation stuff into javax.xml.validation. Below is an example of a method I made to marshal an XJC-generated object to a DOMSource. Note that despite the method being for marshalling the validation is still on-demand, not on-marshal. Also note that the Validator class used is javax.xml.validation.Validator. The validate() method supports more advanced methods of retrieving the output but I am keeping it simple since I am new to JAXB and not trying to make my life complicated.
     public static DOMSource marshalToDOMSource(Object xmlObj, boolean doValidate)
          throws Exception{
          JAXBContext context = JAXBContext.newInstance("com.tmg.emkt.xml.bind");
          Marshaller marshaller = context.createMarshaller();
          SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
          Schema schema = sf.newSchema(new URL(schemaURL));
          String elementName = xmlObj.getClass().getName();
          elementName = elementName.substring(elementName.lastIndexOf(".")+1);
          marshaller.setProperty("jaxb.formatted.output", true);
          DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
          dbf.setNamespaceAware(true);
          DocumentBuilder db = dbf.newDocumentBuilder();
          Document doc = db.newDocument();
          marshaller.marshal(xmlObj,doc);
          DOMSource source = new DOMSource(doc);
          if (doValidate){
               javax.xml.validation.Validator validator = schema.newValidator();
               validator.validate(source);
          return source;
     }