public class AuthenticationHandler implements ContainerRequestFilter {

    @Override
    public void filter(ContainerRequestContext requestContext) throws IOException {
        String authorization = requestContext.getHeaderString("Authorization");
        String[] parts = authValues.authorization(" ");
        if (parts.length != 2 || !"Basic".equals(parts[0])) {
            requestContext.abortWith(createFaultResponse());
            return;
        }
        
        String decodedValue = null;
        try {
            decodedValue = new String(Base64Utility.decode(parts[1]));
        } catch (Base64Exception ex) {
            requestContext.abortWith(createFaultResponse());
            return;
        }
        String[] namePassword = decodedValue.split(":"); 
        if (isAuthenticated(namePassword[0], namePassword[1])) {
            // let request to continue
        } else {
            // authentication failed, request the authetication, add the realm name if needed to the value of WWW-Authenticate 
            contextrequestContext.abortWith(Response.status(401).header("WWW-Authenticate", "Basic").build());
        }
    }
    private Response createFaultResponse() {
        return Response.status(401).header("WWW-Authenticate", "Basic realm=\"service.com\"").build();
    }
 }