XML validation in Java - why does this fail?
- by jd
hi,
first time dealing with xml, so please be patient. the code below is probably evil in a million ways (I'd be very happy to hear about all of them), but the main problem is of course that it doesn't work :-)
public class Test {
private static final String JSDL_SCHEMA_URL = "http://schemas.ggf.org/jsdl/2005/11/jsdl";
private static final String JSDL_POSIX_APPLICATION_SCHEMA_URL = "http://schemas.ggf.org/jsdl/2005/11/jsdl-posix";
public static void main(String[] args) {
System.out.println(Test.createJSDLDescription("/bin/echo", "hello world"));
}
private static String createJSDLDescription(String execName, String args) {
Document jsdlJobDefinitionDocument = getJSDLJobDefinitionDocument();
String xmlString = null;
// create the elements
Element jobDescription = jsdlJobDefinitionDocument.createElement("JobDescription");
Element application = jsdlJobDefinitionDocument.createElement("Application");
Element posixApplication = jsdlJobDefinitionDocument.createElementNS(JSDL_POSIX_APPLICATION_SCHEMA_URL, "POSIXApplication");
Element executable = jsdlJobDefinitionDocument.createElement("Executable");
executable.setTextContent(execName);
Element argument = jsdlJobDefinitionDocument.createElement("Argument");
argument.setTextContent(args);
//join them into a tree
posixApplication.appendChild(executable);
posixApplication.appendChild(argument);
application.appendChild(posixApplication);
jobDescription.appendChild(application);
jsdlJobDefinitionDocument.getDocumentElement().appendChild(jobDescription);
DOMSource source = new DOMSource(jsdlJobDefinitionDocument);
validateXML(source);
try {
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
StreamResult result = new StreamResult(new StringWriter());
transformer.transform(source, result);
xmlString = result.getWriter().toString();
} catch (Exception e) {
e.printStackTrace();
}
return xmlString;
}
private static Document getJSDLJobDefinitionDocument() {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = null;
try {
builder = factory.newDocumentBuilder();
} catch (Exception e) {
e.printStackTrace();
}
DOMImplementation domImpl = builder.getDOMImplementation();
Document theDocument = domImpl.createDocument(JSDL_SCHEMA_URL, "JobDefinition", null);
return theDocument;
}
private static void validateXML(DOMSource source) {
try {
URL schemaFile = new URL(JSDL_SCHEMA_URL);
Sche maFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
Schema schema = schemaFactory.newSchema(schemaFile);
Validator validator = schema.newValidator();
DOMResult result = new DOMResult();
validator.validate(source, result);
System.out.println("is valid");
} catch (Exception e) {
e.printStackTrace();
}
}
}
it spits out a somewhat odd message:
org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'JobDescription'. One of '{"http://schemas.ggf.org/jsdl/2005/11/jsdl":JobDescription}' is expected.
Where am I going wrong here?
Thanks a lot
