public static EObject load(File file) throws IOException {

    ResourceSet resSet = new ResourceSetImpl();

    Map<String, Object> loadMap = configure(resSet);

    URI fileUri = URI.createFileURI(file.getAbsolutePath());
    Resource res = resSet.getResource(fileUri, true);

    res.load(loadMap);
    return res.getContents().get(0);
  }

private static Map<String, Object> configure(ResourceSet resSet) throws IOException {

    Map<String, Object> parserFeatures = new HashMap<String, Object>();
    Map<String, Object> parserProperties = new LinkedHashMap<String, Object>();
    Map<String, Object> loadMap = new HashMap<String, Object>();
    

    loadMap.put(XMLResource.OPTION_USE_PARSER_POOL, new XMLParserPoolImpl());
    loadMap.put(XMLResource.OPTION_EXTENDED_META_DATA, ExtendedMetaData.INSTANCE);

    parserFeatures.put("htp://xml.org/sax/features/validation", Boolean.TRUE);
    URL find = FileLocator.find(Activator.getContext().getBundle(), new Path("model/pack.xsd"), null);
    parserProperties.put("htp://java.sun.com/xml/jaxp/properties/schemaLanguage", "htp://www.w3.org/2001/XMLSchema");

    InputStream schemaStream = find.openStream();
    parserProperties.put("htp://java.sun.com/xml/jaxp/properties/schemaSource", schemaStream);
    resSet.getLoadOptions().put(XMLResource.OPTION_USE_PARSER_POOL, new XMLParserPoolImpl());
    resSet.getLoadOptions().put(XMLResource.OPTION_PARSER_FEATURES, parserFeatures);
    resSet.getLoadOptions().put(XMLResource.OPTION_PARSER_PROPERTIES, parserProperties);

    resSet.getPackageRegistry().put(PackPackage.eINSTANCE.getNsURI(), PackPackage.eINSTANCE);
    resSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put("pack", new PackResourceFactoryImpl());
    return loadMap;
    
  }

public static EObject load(InputStream inStream) throws IOException {
  
      ResourceSet resSet = new ResourceSetImpl();
  
     Map<String, Object> loadMap = configure(resSet);
     
     Resource res = resSet.createResource(URI.createURI("htp:///My.pack"), "pack");
     res.load(inStream, loadMap);
  
     return res.getContents().get(0);
 }

org.eclipse.emf.ecore.xmi.PackageNotFoundException: Package with uri 'null' not found. (htp:///My.pack, 2, 7)

loadMap.put(XMLResource.OPTION_EXTENDED_META_DATA, ExtendedMetaData.INSTANCE);