Class clazz = getBuiltIn(protocol, builtInHandlers);
Class clazz = getBuiltIn(protocol, builtInHandlers, false);
	public URLStreamHandler createURLStreamHandler(String protocol) {		//first check for built in handlers		String builtInHandlers = secureAction.getProperty(PROTOCOL_HANDLER_PKGS);		Class clazz = getBuiltIn(protocol, builtInHandlers);		if (clazz != null)			return null; // let the VM handle it		URLStreamHandler result = null;		if (isMultiplexing()) {			if (findAuthorizedURLStreamHandler(protocol) != null)				result = new MultiplexingURLStreamHandler(protocol, this);		} else {			result = createInternalURLStreamHandler(protocol);		}		// if parent is present do parent lookup		if (result == null && parentFactory != null)			result = parentFactory.createURLStreamHandler(protocol);		return result; //result may be null; let the VM handle it (consider sun.net.protocol.www.*)	}