XSD Schema validation throws SAXParseException in java application using Xerces fails when there are external xsd's included in the Parent

Question

In my java application , I am trying to validate XSD1.1 Schema using XercesJ 2.12.2

My master xsd has multiple xsd's included, like below:

XSD 1.1

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 
    xmlns:xerces="http://xerces.apache.org" 
    attributeFormDefault="unqualified" elementFormDefault="qualified"
    xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning"
    vc:minVersion="1.1" version="1.0.16">
       <xs:include schemaLocation="NIEM_1.xsd"/>
       <xs:include schemaLocation="NIEM_2.xsd"/>
       <xs:include schemaLocation="NIEM_2.xsd"/>

But the validation code fails to load external schemas, and throws exceptions like the one below, wherever parent xsd is referencing types defined in included xsd.

org.xml.sax.SAXParseException; lineNumber: 1456; columnNumber: 79; src-resolve: Cannot resolve the name 'EYECodeSimpleType' to a(n) 'type definition' component.

Java

 SchemaFactory factory = SchemaFactory.newInstance("http://www.w3.org/XML/XMLSchema/v1.1");
 Schema schema = factory.newSchema(new StreamSource(loadExampleSchema("Example.xsd")));
 Validator validator = schema.newValidator();
 validator.validate(new StreamSource(new ByteArrayInputStream(xml.getBytes())));

For reference, I am using the following jars:

• cupv10k-runtime.jar
• icu4j-69_1.jar
• org.eclipse.wst.xml.xpath2.processor_1.2.1.jar
• xercesImpl.jar
• xml-apis.jar

Please Help.

I am expecting the java application to load all the included xsds and validates types defined in them.

Answer 1

To resolve a schema document reference such as

<xs:include schemaLocation="NIEM_1.xsd"/>

the schema processor needs to know the base URI of the containing schema document. With JAXP interfaces the usual way it gets to know this is using the SystemId property of the Source object. If you supply a Source that is not associated with any base URI, for example a simple byte stream or a DOM source, the processor has no idea where to look for the schema location.

A more helpful schema processor would, however, give you better diagnostics.

Answer 2

So finally I figured out the solution. Here is the code snippet that worked for me. Thamk you all for pointers

 InputStream inStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(xsdFileName);
      String  realPath= getClass().getClassLoader().getResource(xsdFileName).getFile();
      StreamSource streamSource = new StreamSource(inStream);
      streamSource.setSystemId(realPath);
      Source source = streamSource;
      Schema schema = factory.newSchema(source);
   
      // Create a Validator from the Schema
      Validator validator = schema.newValidator();
  validator.validate(new StreamSource(neByteArrayInputStream(xml.getBytes())));