BeansXmlParser has the following code:

try

{ 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", loadXsds()); }

catch (IllegalArgumentException e)

{ // No op, we just don't validate the XML }

However, the actual exception thrown (according to the javadoc) is a SAXNotRecognizedException or a SAXNotSupportedException, which means that if the underlying SAX impl does not support those properties then parsing will fail.