How to Validate xml using xsd schema and SAX? - xsd-validation

Question

I will describe my problem with xml.
first i defined my xsd schema with namespaces and it looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.example.org/schema"
xmlns:tns="http://www.example.org/schema" elementFormDefault="qualified">
<element name="Clients" type="tns:ClientsType"></element>
<complexType name="ContactType">
<sequence>
<element name="Type" type="string"></element>
</sequence>
<attribute name="ID" type="long" />
</complexType>
<complexType name="Contact">
<sequence>
<element name="ContactType" type="tns:ContactType"></element>
<element name="Value" type="string"></element>
</sequence>
<attribute name="ID" type="long" />
</complexType>
<complexType name="ContactsType">
<sequence>
<element name="Contact" type="tns:Contact" maxOccurs="unbounded"></element>
</sequence>
</complexType>
<complexType name="ClientType">
<sequence>
<element name="FirstName" type="string"></element>
<element name="SecondName" type="string"></element>
<element name="Contacts" type="tns:ContactsType"></element>
</sequence>
<attribute name="ID" type="long" />
</complexType>
<complexType name="ClientsType">
<sequence>
<element name="Client" type="tns:ClientType" maxOccurs="unbounded"></element>
</sequence>
</complexType>
so it generated obvious xml looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<tns:Clients xmlns:tns="http://www.example.org/schema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.example.org/schema schema.xsd ">
<tns:Client ID="0">
<tns:FirstName>tns:FirstName</tns:FirstName>
<tns:SecondName>tns:SecondName</tns:SecondName>
<tns:Contacts>
<tns:Contact ID="0">
<tns:ContactType ID="0">
<tns:Type>tns:Type</tns:Type>
</tns:ContactType>
<tns:Value>tns:Value</tns:Value>
</tns:Contact>
</tns:Contacts>
</tns:Client>
and my function creating specific xml with data:
#Override
public void printToFile() throws IOException, XMLStreamException {
FileWriter fd = new FileWriter(outPath);
Random rand = new Random();
int end = rand.nextInt(1000);
try{
XMLOutputFactory xof = XMLOutputFactory.newInstance();
XMLStreamWriter xtw = null;
xtw = xof.createXMLStreamWriter(fd);
xtw.writeStartDocument();
//xtw.setPrefix("tns", "http://www.example.org/schema");
xtw.writeStartElement("Clients");
xtw.writeNamespace("tns", "http://www.example.org/schema");
xtw.writeStartElement("tns","Client", "http://www.example.org/schema");
//xtw.writeStartElement("Client");
xtw.writeAttribute("ID", "1");
xtw.writeStartElement("FirstName");
xtw.writeCharacters("NameFirst");
xtw.writeEndElement();
xtw.writeStartElement("SecondName");
xtw.writeCharacters("NameSecond");
xtw.writeEndElement();
xtw.writeStartElement("Contacts");
for(int i=1;i<2;i++){
xtw.writeStartElement("Contact");
xtw.writeAttribute("ID",Integer.toString(i));
xtw.writeStartElement("ContactType");
xtw.writeAttribute("ID", Integer.toString(i));
xtw.writeStartElement("Type");
xtw.writeCharacters("mojTyp");
xtw.writeEndElement();
xtw.writeEndElement();
xtw.writeStartElement("Value");
xtw.writeCharacters("value");
xtw.writeEndElement();
xtw.writeEndElement();
}
xtw.writeEndElement();
//xtw.writeEndElement();
xtw.writeEndDocument();
}catch(XMLStreamException xmlE)
{
}
finally
{
fd.close();
}
}
and I generate simple Junit test usinx Sax to validate my xml created by my function:
#Test
public void testPrintToFileGoodXml() throws IOException,
XMLStreamException, FactoryConfigurationError, SAXException {
mService.printToFile();
XMLStreamReader reader = XMLInputFactory.newInstance()
.createXMLStreamReader(new FileInputStream(myPath));
SchemaFactory factory = SchemaFactory
.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
Schema schema = factory.newSchema(new File(mySchemaPath));
Validator validator = schema.newValidator();
validator.validate(new StAXSource(reader));
assertTrue(true);
}
But the test is fail so I think there is problem with my printToFile function connected with namespaces and the other properties defined in the xsd schema, and I don't know how to solve it. I read many sites and the documentation of defining xsd and I still don't know how to solve my problem. Please help.

Answer 1

The schema says the root element should be Clients
However your XML Snippet has an opening element tns:Clients, but no coresponsing closing element. Check your writeEndElement calls tally up.
<?xml version="1.0" encoding="UTF-8"?>
<tns:Clients xmlns:tns="http://www.example.org/schema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.example.org/schema Contacts.xsd ">
<tns:Client ID="0">
<tns:FirstName>tns:FirstName</tns:FirstName>
<tns:SecondName>tns:SecondName</tns:SecondName>
<tns:Contacts>
<tns:Contact ID="0">
<tns:ContactType ID="0">
<tns:Type>tns:Type</tns:Type>
</tns:ContactType>
<tns:Value>tns:Value</tns:Value>
</tns:Contact>
</tns:Contacts>
</tns:Client>
</tns:Clients> <--------- Missing