Meta model fails to be loaded in some Eclipse configurations

Class MetaLibLoader creates instance of SAX parser using standard XMLReaderFactory.createXMLReader(className) method, which loads class by context classloader. Context class loader in some Eclipse configurations may be that which does not see library with parser implementation. It seems that we should replace this method with loading class by bundle class loader of plugin org.apache.xerces and if that plugin is not available, use DOM parser.