How to use

SchemaBaseValidator$MyResourceResolver

in

ca.uhn.fhir.validation

private Schema loadSchema(String theVersion, String theSchemaName) {
  String key = theVersion + "-" + theSchemaName;
  synchronized (myKeyToSchema) {
    Schema schema = myKeyToSchema.get(key);
    if (schema != null) {
      return schema;
    }
    Source baseSource = loadXml(null, theSchemaName);
    SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
    schemaFactory.setResourceResolver(new MyResourceResolver());
    try {
      try {
      /*
       * See https://github.com/jamesagnew/hapi-fhir/issues/339
       * https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing
       */
        schemaFactory.setProperty(XMLConstants.ACCESS_EXTERNAL_DTD, "");
      }catch (SAXNotRecognizedException snex){
        ourLog.warn("Jaxp 1.5 Support not found.",snex);
      }
      schema = schemaFactory.newSchema(new Source[] { baseSource });
    } catch (SAXException e) {
      throw new ConfigurationException("Could not load/parse schema file: " + theSchemaName, e);
    }
    myKeyToSchema.put(key, schema);
    return schema;
  }
}

private Schema loadSchema(String theVersion, String theSchemaName) {
  String key = theVersion + "-" + theSchemaName;
  synchronized (myKeyToSchema) {
    Schema schema = myKeyToSchema.get(key);
    if (schema != null) {
      return schema;
    }
    Source baseSource = loadXml(null, theSchemaName);
    SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
    schemaFactory.setResourceResolver(new MyResourceResolver());
    try {
      try {
      /*
       * See https://github.com/jamesagnew/hapi-fhir/issues/339
       * https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing
       */
        schemaFactory.setProperty(XMLConstants.ACCESS_EXTERNAL_DTD, "");
      }catch (SAXNotRecognizedException snex){
        ourLog.warn("Jaxp 1.5 Support not found.",snex);
      }
      schema = schemaFactory.newSchema(new Source[] { baseSource });
    } catch (SAXException e) {
      throw new ConfigurationException("Could not load/parse schema file: " + theSchemaName, e);
    }
    myKeyToSchema.put(key, schema);
    return schema;
  }
}