class UnauthorizedEntryPoint implements AuthenticationEntryPoint
{

	@Override
	public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException authException)
			throws IOException, ServletException
	{<FILL_FUNCTION_BODY>}

}

		response.sendError(
				HttpServletResponse.SC_UNAUTHORIZED,
				"Unauthorized: Authentication token was either missing or invalid.");
	
<no_super_class>