SAX XSD Validation. Error callback is called twice.

[Mark Reyes]

Hi All,

I have some doubt regarding schema validation using SAX parser. Please take a look at my code.

public class SAXXMLParser {
	public void validateFile(String strFileName, String strSchemaURL) {
		// TODO Auto-generated method stub
		SAXParserFactory factory = SAXParserFactory.newInstance();
		try {
			factory.setNamespaceAware(true);
			factory.setValidating(true);
			factory.setFeature("http://xml.org/sax/features/validation", true);
			factory.setFeature("http://apache.org/xml/features/validation/schema", true);
			factory.setFeature("http://apache.org/xml/features/validation/schema-full-checking",true);
			SAXParser parser = factory.newSAXParser();

			// Set schema properties
			parser.setProperty("http://java.sun.com/xml/jaxp/properties/schemaLanguage","http://www.w3.org/2001/XMLSchema");
			parser.setProperty("http://java.sun.com/xml/jaxp/properties/schemaSource",strSchemaURL);
			SAXHandler handler = new SAXHandler();
			parser.parse(new File(strFileName), handler);

			if (handler.validationError) {
				System.out.println("XML Document has Error:"
						+ handler.saxParseException.getMessage());
			} else {
				System.out.println("XML Document is valid!");
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	private class SAXHandler extends DefaultHandler {
		// err handler
		public boolean validationError = false;
		public SAXParseException saxParseException = null;

		public void error(SAXParseException exception) throws SAXException {
			validationError = true;
			saxParseException = exception;
		}

		public void fatalError(SAXParseException exception) throws SAXException {
			validationError = true;
			saxParseException = exception;
		}

		public void warning(SAXParseException exception) throws SAXException {
		}

	}

}

public class ClassStarter {
	public static void main(String[] args) {
		final String filePath = "src\\com\\dom\\xml\\course_data.xml";
		final String schemaPath = "src\\com\\dom\\xml\\course_data.xsd";
		
		SAXXMLParser parser = new SAXXMLParser();
		parser.validateFile(filePath, schemaPath);

	}
}

When I run below code using eclipse, I am getting below output.

schema_reference.4: Failed to read schema document 'src\com\dom\xml\course_data.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
cvc-complex-type.2.4.d: Invalid content was found starting with element 'memo'. No child element is expected at this point.

I intentionally add another tag which is not allowed in the schema. But my concern is that the first line of error says that it cannot find my xsd file.
But on the second error callback, it was able to point out the correct error.

Is this normal or something is wrong with my code? Thanks.