Pojo to xsd generation

Question

Is there a library which could generate a xsd schema from a java class? Google yields lots of results the opposite ( java classes from xsd ).

Answer 1

JAXB 2.0 allows you to create a XML schema from an annotated Java class.

You'll find some examples at the AMIS blog and at the JavaPassion site.

Answer 2

Here is how I would do it:

public static void pojoToXSD(Class<?> pojo, OutputStream out) throws IOException, TransformerException, JAXBException {
    JAXBContext context = JAXBContext.newInstance(pojo);
    final List<DOMResult> results = new ArrayList<>();

    context.generateSchema(new SchemaOutputResolver() {

        @Override
        public Result createOutput(String ns, String file)
                throws IOException {
            DOMResult result = new DOMResult();
            result.setSystemId(file);
            results.add(result);
            return result;
        }
    });

    DOMResult domResult = results.get(0);

    // Use a Transformer for output
    TransformerFactory tFactory = TransformerFactory.newInstance();
    Transformer transformer = tFactory.newTransformer();

    DOMSource source = new DOMSource(domResult.getNode());
    StreamResult result = new StreamResult(out);
    transformer.setOutputProperty(OutputKeys.INDENT, "yes");
    transformer.transform(source, result);
}

How to use the method above

try {
        ByteArrayOutputStream stream = new ByteArrayOutputStream();

        pojoToXSD(NESingleResponse.class, stream);

        String finalString = new String(stream.toByteArray());
        System.out.println(finalString);
    } catch (JAXBException ex) {
        Logger.getLogger(NewClass.class.getName()).log(Level.SEVERE, null, ex);
    }