Consume an OAuth-secured REST webservice using Spring oauth2 - spring

Question

I want to consume a REST webservice from a server which protects his resources using oauth2.
I use Spring boot (JHipster).
To do this i have in SecurityConfiguration class this :
#Value("${oauth.resource:http://sercverUsingOAuth2}")
private String baseUrl;
#Value("${oauth.authorize:http://sercverUsingOAuth2/rest/oauth/token}")
private String authorizeUrl;
#Value("${oauth.token:http://sercverUsingOAuth2/rest/oauth/token}")
private String tokenUrl;
#Bean
public OAuth2RestOperations oauth2RestTemplate() {
AccessTokenRequest atr = new DefaultAccessTokenRequest();
return new OAuth2RestTemplate(resource(),
new DefaultOAuth2ClientContext(atr));
}
#Bean
protected OAuth2ProtectedResourceDetails resource() {
AuthorizationCodeResourceDetails resource = new AuthorizationCodeResourceDetails();
resource.setAccessTokenUri(tokenUrl);
resource.setUserAuthorizationUri(authorizeUrl);
resource.setClientId("client_id");
resource.setClientSecret("client_secret");
resource.setGrantType("grant_type");
return resource;
}
This class (SecurityConfiguration) is annoted using :
#Configuration
#EnableWebSecurity
#EnableOAuth2Client
And this is my controller (Spring MVC) :
#RestController
#RequestMapping("/consume")
public class MyContrtoller {
#Inject
private OAuth2RestOperations oauth2RestTemplate;
#RequestMapping(value = "/oauth2", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
public List<DataModel> getProducts() {
ResponseEntity<MyModel> forEntity = oauth2RestTemplate
.getForEntity("http://sercverUsingOAuth2/rest/resourceToConsume",
MyModel.class);
return forEntity.getBody().getData();
}
}
However when i want to consume my webservice (http://myHost/consume/oauth2) i get this Exception :
org.springframework.security.oauth2.client.resource.OAuth2AccessDeniedException:
Unable to obtain a new access token for resource 'null'. The provider manager
is not configured to support it.
I have googled and i found this :
github
stackoverflow
But it doesn't help me.
Thanks.

Answer 1

You are using the same URL for the authorization url and the token url. That was my first clue, then I saw your comments.
Even though you are changing the grant type, you are still using "AuthorizationCodeResourceDetails" when you should be using "ClientCredentialsResourceDetails" instead. This type of ResourceDetails is meant to be used for the case you are explaining.
ClientCredentialsResourceDetails resource = new ClientCredentialsResourceDetails();
resource.setAccessTokenUri(TOKEN_URL);
resource.setClientId(CLIENT_ID);
resource.setClientSecret(CLIENT_SECRET);
resource.setClientAuthenticationScheme(AuthenticationScheme.form); //This line isn't always needed
return resource;