How to get error's line number while validating a XML file against a XML schema
Solution 1
I found this
http://www.herongyang.com/XML-Schema/Xerces2-XSD-Validation-with-XMLReader.html
that appears to provide the following details(to include line numbers)
Error:
Public ID: null
System ID: file:///D:/herong/dictionary_invalid_xsd.xml
Line number: 7
Column number: 22
Message: cvc-datatype-valid.1.2.1: 'yes' is not a valid 'boolean'
value.
using this code:
/**
* XMLReaderValidator.java
* Copyright (c) 2002 by Dr. Herong Yang. All rights reserved.
*/
import java.io.IOException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.XMLReaderFactory;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
class XMLReaderValidator {
public static void main(String[] args) {
String parserClass = "org.apache.xerces.parsers.SAXParser";
String validationFeature
= "http://xml.org/sax/features/validation";
String schemaFeature
= "http://apache.org/xml/features/validation/schema";
try {
String x = args[0];
XMLReader r = XMLReaderFactory.createXMLReader(parserClass);
r.setFeature(validationFeature,true);
r.setFeature(schemaFeature,true);
r.setErrorHandler(new MyErrorHandler());
r.parse(x);
} catch (SAXException e) {
System.out.println(e.toString());
} catch (IOException e) {
System.out.println(e.toString());
}
}
private static class MyErrorHandler extends DefaultHandler {
public void warning(SAXParseException e) throws SAXException {
System.out.println("Warning: ");
printInfo(e);
}
public void error(SAXParseException e) throws SAXException {
System.out.println("Error: ");
printInfo(e);
}
public void fatalError(SAXParseException e) throws SAXException {
System.out.println("Fattal error: ");
printInfo(e);
}
private void printInfo(SAXParseException e) {
System.out.println(" Public ID: "+e.getPublicId());
System.out.println(" System ID: "+e.getSystemId());
System.out.println(" Line number: "+e.getLineNumber());
System.out.println(" Column number: "+e.getColumnNumber());
System.out.println(" Message: "+e.getMessage());
}
}
}
Solution 2
Replace this line:
validator.validate(new DOMSource(document));
by
validator.validate(new StreamSource(new File("myxml.xml")));
will let the SAXParseException contain line number & column number
Solution 3
Try using a SAXLocator http://download.oracle.com/javase/1.5.0/docs/api/org/xml/sax/Locator.html Parsers are not required to supply one, but if they do it should report line numbers
I think your code should include:
// this will be called when XML-parser starts reading
// XML-data; here we save reference to current position in XML:
public void setDocumentLocator(Locator locator) {
this.locator = locator;
}
The parser will give you a locator which you can then use to get the line number. It's probably worth printing/debugging when this happens to see if you have a valid locator
pablosaraiva
Updated on July 09, 2022Comments
-
pablosaraiva almost 2 years
I'm trying to validade a XML against a W3C XML Schema.
The following code does the job and reports when error occurs. But I'm unable to get line number of the error. It always returns -1.
Is there a easy way to get the line number?
import java.io.File; import javax.xml.XMLConstants; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.Source; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamSource; import javax.xml.validation.Schema; import javax.xml.validation.SchemaFactory; import javax.xml.validation.Validator; import org.w3c.dom.Document; import org.xml.sax.SAXParseException; public class XMLValidation { public static void main(String[] args) { try { DocumentBuilder parser = DocumentBuilderFactory.newInstance().newDocumentBuilder(); Document document = parser.parse(new File("myxml.xml")); SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); Source schemaFile = new StreamSource(new File("myschema.xsd")); Schema schema = factory.newSchema(schemaFile); Validator validator = schema.newValidator(); validator.validate(new DOMSource(document)); } catch (SAXParseException e) { System.out.println(e.getLineNumber()); e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } }