FULL PRODUCT VERSION :
openjdk version "1.8.0_102"
OpenJDK Runtime Environment (build 1.8.0_102-8u102-b14.1-2-b14)
OpenJDK 64-Bit Server VM (build 25.102-b14, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Linux 4.8.0-2-amd64 #1 SMP Debian 4.8.11-1 (2016-12-02) x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
A java.xml.validation.schema.newValiator() won't validate when the given XML has been built from a DomSource

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
See attached script

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
attached script should output

validation OK from String Resource
validation OK from DOM Resource
ACTUAL -
attached script outputs:

validation OK from String Resource
validation NOK from DOM Resource reason:org.xml.sax.SAXParseException; cvc-elt.1 : Déclaration de l'élément 'per:person' introuvable.


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.io.IOException;
import java.io.StringReader;

import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.*;

import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class MainValTest
{

public static String XMLSTR = "<per:person xmlns:per=\"http://www.tbrc.org/models/person\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" RID=\"P1331\" status=\"released\" xsi:schemaLocation=\"http://www.tbrc.org/models/person person.xsd\"/>";
public static String XSDSTR = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
+"<xsd:schema xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\""
+" targetNamespace=\"http://www.tbrc.org/models/person\" xmlns:per=\"http://www.tbrc.org/models/person\""
+" xmlns=\"http://www.tbrc.org/models/person\""
+" elementFormDefault=\"qualified\" attributeFormDefault=\"unqualified\">"
+" <xsd:element name=\"person\" type=\"Person\"/>"
+" <xsd:complexType name=\"Person\">"
+" <xsd:attribute name=\"RID\" type=\"xsd:string\" use=\"required\"/>"
+" <xsd:attribute name=\"status\" type=\"xsd:string\" default=\"editing\"/>"
+" </xsd:complexType>"
+"</xsd:schema>";

public static void main(String[] args)
{
Source xsdSource = new StreamSource(new StringReader(XSDSTR));

Source xmlSourceFromString = new StreamSource(new StringReader(XMLSTR));

// build xmlSourceFromDom
DocumentBuilder parser;
try {
parser = DocumentBuilderFactory.newInstance().newDocumentBuilder();
} catch (ParserConfigurationException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return;
}
Document documenttest;
try {
documenttest = parser.parse(new InputSource( new StringReader( XMLSTR )));
} catch (SAXException | IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return;
}
Source xmlSourceFromDom = new DOMSource(documenttest);

// build validator
SchemaFactory schemaFactory = SchemaFactory
          .newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
Schema schema;
try {
schema = schemaFactory.newSchema(xsdSource);
} catch (SAXException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return;
}
Validator validator = schema.newValidator();

// validate
try {
validator.validate(xmlSourceFromString);
System.out.println("validation OK from String Resource");
} catch (SAXException e) {
System.out.println("validation NOK from String Resource reason:" + e);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
validator.validate(xmlSourceFromDom);
System.out.println("validation OK from DOM Resource");
} catch (SAXException e) {
System.out.println("validation NOK from DOM Resource reason:" + e);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
---------- END SOURCE ----------