[ HttpClientErrorException] - Team City rest api using spring resttemplate

I need to use Team City rest api in spring rest template in order to get build status but the code snap giving the error , could you help

solve this error ? 

RestTemplate restTemplate = new RestTemplate();
        HttpHeaders headers = new HttpHeaders();
        headers.set("username",username);
        headers.set("password",passweord);
        headers.setContentType(MediaType.APPLICATION_JSON);
        HttpEntity entity = new HttpEntity(headers);
        System.out.println(">>>>>>>" + restTemplate.exchange(url, HttpMethod.GET, entity, String.class).getBody());

Error : 
for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.client.HttpClientErrorException: 401 null] with root cause

org.springframework.web.client.HttpClientErrorException: 401 null


Note : The same API is working Advance Rest Client and Postman 

Thanks : Muthu Selvan SR