Spring REST template - 401 Unauthorized error - spring

Question

I am using Spring Rest Template inside a Spring Boot Application.
I always get 401 Unauthorized error even though I am passing the credentials.
I am able to access this service by Chrome REST Web Service Client.
Is there a simplified way to access the REST template in SpringBoot.
Below is the code snippet done so far which results in 401 error
private DetailsBean invokeDetailsRestService(UserParam userParam){
ResponseEntity<DetailsBean> responseEntity = null;
String url = "https://dev.com/app/identifyuser/";
RestClientConfig restClientConfig =new RestClientConfig("user123","pass123");
responseEntity= restClientConfig.postForEntity(url, userParam, DetailsBean.class);
log.debug("User Details : {} ", responseEntity.getBody());
return responseEntity.getBody();
}
public ClientHttpRequestFactory getRequestFactory(String userName,String password){
CredentialsProvider credsProvider = new BasicCredentialsProvider();
credsProvider.setCredentials( new AuthScope(null, -1), new UsernamePasswordCredentials(userName,password) );
HttpClient httpClient = HttpClients.custom().setDefaultCredentialsProvider(credsProvider).build();
return new HttpComponentsClientHttpRequestFactory(httpClient);
}
RestClientConfig class
public RestClientConfig(String username, String password) {
CredentialsProvider credsProvider = new BasicCredentialsProvider();
credsProvider.setCredentials(
new AuthScope(null, -1),
new UsernamePasswordCredentials(username, password));
HttpClient httpClient = HttpClients.custom().setDefaultCredentialsProvider(credsProvider).build();
setRequestFactory(new HttpComponentsClientHttpRequestFactory(httpClient));
}
Error:
WARN c7af55b5-1cac-4db6-a202-202416c27ba4
12612 --- [apr-8082-exec-8] o.a.http.impl.auth.HttpAuthenticator
: NEGOTIATE authentication error:
No valid credentials provided (Mechanism level:
No valid credentials provided (Mechanism level:
Failed to find any Kerberos tgt))

Answer 1

The authorization issue was fixed with the below code..
Credentials should be passed to a Spring REST Template with the below code:
String userAndPass = "Test:Test123";
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_XML);
headers.add("Authorization", "Basic " + Base64Utility.encode(userAndPass.getBytes()));

Answer 2

I faced similar issue when i'm trying to make call to webservice, this solved my issue:
restTemplate.getInterceptors().add(new BasicAuthorizationInterceptor("userName", "password"));
restTemplate.postForObject('','',''');
Pass the credentials like this, it should solve the issue.

Answer 3

I used spring boot 2.2.4.RELEASE version. then I work below way.
RestTemplate restTemplate = new RestTemplate();
restTemplate.getInterceptors().add(new BasicAuthenticationInterceptor(username, password));
RequestDto requestDto = new RequestDto();
// set parameter
ResponseDto response = restTemplate.postForObject(URL, requestDto, ResponseDto.class);
Or
RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
headers.setBasicAuth(username, password);
RequestDto requestDto = new RequestDto();
// set parameter
HttpEntity<RequestDto> request = new HttpEntity<>(requestDto, headers);
ResponseDto response = restTemplate.postForObject(URL, request, ResponseDto.class);