Develop Reference

Getting 400 Bad Request for Rest Template Spring Boot

I have a rest Controller where i am trying to get the Token from a service using the RestTemplate in Spring Boot. The application works fine when i use Postman but from Java Application i get 400 Bad Request.
My Java Sample :
#PostMapping("/service")
private String generateAuthenticationToken() {
HttpHeaders authenticationTokenHeaders = new HttpHeaders();
authenticationTokenHeaders.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
JSONObject sfmcBUCredential = new JSONObject();
JSONObject sfmcTokenResponseObject;
sfmcBUCredential.put("grant_type", sfmcConfig.getGrant_type());
sfmcBUCredential.put("client_id", sfmcConfig.getClient_id());
sfmcBUCredential.put("client_secret", sfmcConfig.getClient_secret());
String sfmcBUCredentialString = sfmcBUCredential.toString();
System.out.println("Values before sending to POST Request are :::" + sfmcBUCredentialString);
HttpEntity<String> getTokenEntity = new HttpEntity<>(sfmcBUCredentialString, authenticationTokenHeaders);
System.out.println("Values after sending to POST Request are :::" + getTokenEntity.toString());
System.out.println("URL is :::" + GET_SFMC_ENDPOINT_URL);
//String tokenResponse = restTemplate.postForObject(GET_SFMC_ENDPOINT_URL, getTokenEntity, String.class);
ResponseEntity<String> tokenResponse = restTemplate.exchange(GET_SFMC_ENDPOINT_URL, HttpMethod.POST, getTokenEntity, String.class);
sfmcTokenResponseObject = new JSONObject(tokenResponse.getBody());
System.out.println("tokenResponse::::::::" + sfmcTokenResponseObject.getString("access_token").toString());
return sfmcTokenResponseObject.getString("access_token");
}
Logs :
Values before sending to POST Request are :::{"grant_type":"client_credentials","client_secret":"c1ae4b4a-498e-46a0-a02e-cd2378cb8db6","client_id":"Y43iLAhr4e0SoJ9KkV4vLKnGhNmS1Y3c"}
Values after sending to POST Request are :::<{"grant_type":"client_credentials","client_secret":"c1ae4b4a-498e-46a0-a02e-cd2378cb8db6","client_id":"Y43iLAhr4e0SoJ9KkV4vLKnGhNmS1Y3c"},[Content-Type:"application/x-www-form-urlencoded"]>
URL is :::https://keycloak.lab.hci.aetna.com/auth/realms/master/protocol/openid-connect/token

Try something like this:
RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
MultiValueMap<String, String> map = new LinkedMultiValueMap<>();
map.add("grant_type", sfmcConfig.getGrant_type());
map.add("client_id", sfmcConfig.getClient_id());
map.add("client_secret", sfmcConfig.getClient_secret());
HttpEntity<MultiValueMap<String, String>> entity = new HttpEntity<>(map, headers);
ResponseEntity<LabelCreationResponse> response =
restTemplate.exchange("url",
HttpMethod.POST,
entity,
String.class);

How to pass Headers and request body in POST request?

I am using RestTemplate restTemplate.exchangemethod to POST request to an endpoint. I have OAuth Header and HttpEntity in different file which I want to pass to POST request, in addition to this I also want to pass request to the endpoint.
I was able to successfully pass the headers and request, but not Http entity which contains credentials
ResponseEntity<String> result = restTemplate.exchange(uri, HttpMethod.POST,
new HttpEntity<>(request, dataRepo.getHeader()), String.class);
Is there any way I can pass all 3 things
HttpEntity
HttpHeaders
request
Here is my code
#RunWith(MockitoJUnitRunner.class)
#TestPropertySource
public class DataTest {
#Inject
private Oauth oauth;
#Mock
private DataRepo dataRepo;
RestTemplate restTemplate = new RestTemplate();
#Qualifier(OAuth2HttpHeadersBuilder.BEAN_NAME)
NewHttpHeader headersBuilder;
#Test
public void testAddEmployeeSuccess() throws URISyntaxException {
URI uri = new URI(url);
Set<String> mockData = Stream.of("A","B").collect(Collectors.toSet());
String onsString = String.join(",", mockData);
Map<String, String> requestBody = new HashMap<>();
requestBody.put("name", onsString);
JSONObject jsonObject = new JSONObject(requestBody);
HttpEntity<String> request = new HttpEntity<>(jsonObject.toString(), null);
ResponseEntity<String> result = restTemplate.exchange(uri, HttpMethod.POST,
new HttpEntity<>(request, dataRepo.getHeader()), String.class);
Assert.assertEquals(201, result.getStatusCodeValue());
}
The below code is in NewHttpHeader.java file which contains
Header and HttpEntity
private HttpEntity<MultiValueMap<String,String>> getHttpEntity() {
MultiValueMap<String, String> store = new LinkedMultiValueMap<>();
store.add( "pas", "password" );
store.add( "name", config.getVaultServiceAccountName() );
return new HttpEntity<>( store, getHeader() );
}
private HttpHeaders getHeader() {
HttpHeaders httpHeaders = headersBuilder.build();
httpHeaders.add( HttpHeaders.ACCEPT, ContentType.APPLICATION_JSON.getMimeType() );
httpHeaders.add( HttpHeaders.CONTENT_TYPE, ContentType.APPLICATION_FORM_URLENCODED.getMimeType() );
return httpHeaders;
}
}

Quoting question:
Is there any way I can pass all 3 things
HttpEntity
HttpHeaders
request
Quoting javadoc of HttpEntity:
Represents an HTTP request or response entity, consisting of headers and body.
So the answer to your question is: Yes, you can pass all 3, since the first is nothing but a combination of the other two.
Just merge your two HttpEntity objects.
Before
HttpEntity<String> request = new HttpEntity<>(jsonObject.toString(), null);
ResponseEntity<String> result = restTemplate.exchange(uri, HttpMethod.POST,
new HttpEntity<>(request, dataRepo.getHeader()), String.class);
After
HttpEntity<String> request = new HttpEntity<>(jsonObject.toString(), dataRepo.getHeader());
ResponseEntity<String> result = restTemplate.exchange(uri, HttpMethod.POST,
request, String.class);

restTemplate exchange often leads into 400 Error

In my Android app I try to make a GET request via restTemplate.exchange but it leads very often into a 400 error very seldom it's a 200 response.
GET request for "http://someURL/items/modified/2018-12-20T12%253A47%253A43%252B01%253A00" resulted in 400 (); invoking error handler
org.springframework.web.client.HttpClientErrorException: 400
I tried to do the request with encoded and decoded parameter but it's the same problem. The only thing what changes is the timestamp in the request. I don't think it's a backend problem, because I did a couple requests via Swagger and Postman on the same interface and all of them worked without a problem. I also tried to update spring-android to version 2.0.0.M3 but still the same problem.
String url = ServiceAppConstants.HOSTNAME + ServiceAppConstants.REST_ITEMS_MODIFIED + URLEncoder.encode(lastSynchronisationDate);
try {
HttpEntity<String> httpEntity = RestServiceUtils.getHttpEntity(context);
RestTemplate restTemplate = new RestTemplate();
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
// runs in the error here
ResponseEntity<ArrayList> response = restTemplate.exchange(url, HttpMethod.GET, httpEntity, ArrayList.class);
items= response.getBody();
items = mapper.convertValue(items, new TypeReference<List<Items>>(){});
} catch (RestClientException e) {
/* do stuff */
}
to set the token
#NonNull
public static HttpEntity<String> getHttpEntity(Context context) {
UserStorage userStorage = new UserStorage(context);
HttpHeaders headers = new HttpHeaders();
try {
String token = userStorage.getJsonWebToken();
headers.set(ServiceAppConstants.HEADER_SECURITY_TOKEN, token);
}catch (Exception ex){
Log.e(RestServiceUtils.class.getName(), "Could not get json web token", ex);
}
return new HttpEntity<String>("parameters", headers);
}
This is how the request looks like in the android profiler
This is how the request looks like if it's send by swagger

use new HttpEntity(headers); (without "parameters")
the "parameters" string is the request body according to HttpEntity documentation
that might caused the problem.

Spring RestTemplate POST Request with URL encoded data

I'm new to Spring and trying to do a rest request with RestTemplate. The Java code should do the same as below curl command:
curl --data "name=feature&color=#5843AD" --header "PRIVATE-TOKEN: xyz" "https://someserver.com/api/v3/projects/1/labels"
But the server rejects the RestTemplate with a 400 Bad Request
RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
headers.add("PRIVATE-TOKEN", "xyz");
HttpEntity<String> entity = new HttpEntity<String>("name=feature&color=#5843AD", headers);
ResponseEntity<LabelCreationResponse> response = restTemplate.exchange("https://someserver.com/api/v3/projects/1/labels", HttpMethod.POST, entity, LabelCreationResponse.class);
Can somebody tell me what I'm doing wrong?

I think the problem is that when you try to send data to server didn't set the content type header which should be one of the two: "application/json" or "application/x-www-form-urlencoded" . In your case is: "application/x-www-form-urlencoded" based on your sample params (name and color). This header means "what type of data my client sends to server".
RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
headers.add("PRIVATE-TOKEN", "xyz");
MultiValueMap<String, String> map = new LinkedMultiValueMap<>();
map.add("name","feature");
map.add("color","#5843AD");
HttpEntity<MultiValueMap<String, String>> entity = new HttpEntity<>(map, headers);
ResponseEntity<LabelCreationResponse> response =
restTemplate.exchange("https://foo/api/v3/projects/1/labels",
HttpMethod.POST,
entity,
LabelCreationResponse.class);

You need to set the Content-Type to application/json. Content-Type has to be set in the request. Below is the modified code to set the Content-Type
final String uri = "https://someserver.com/api/v3/projects/1/labels";
String input = "US";
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
headers.add("PRIVATE-TOKEN", "xyz");
HttpEntity<String> request = new HttpEntity<String>(input, headers);
ResponseEntity<LabelCreationResponse> response = restTemplate.postForObject(uri, request, LabelCreationResponse.class);
Here, HttpEntity is constructed with your input i.e "US" and with headers.
Let me know if this works, if not then please share the exception.
Cheers!

It may be a Header issue check if the header is a Valid header, are u referring to "BasicAuth" header?
HttpHeaders headers = new HttpHeaders();
headers.add("Content-Type", MediaType.APPLICATION_FORM_URLENCODED.toString());
headers.add("Accept", MediaType.APPLICATION_JSON.toString()); //Optional in case server sends back JSON data
MultiValueMap<String, String> requestBody = new LinkedMultiValueMap<String, String>();
requestBody.add("name", "feature");
requestBody.add("color", "#5843AD");
HttpEntity formEntity = new HttpEntity<MultiValueMap<String, String>>(requestBody, headers);
ResponseEntity<LabelCreationResponse> response =
restTemplate.exchange("https://example.com/api/request", HttpMethod.POST, formEntity, LabelCreationResponse.class);

my issue, the MessageConverters contains other converters may converts then entity to json (like FastJsonHttpMessageConverter). So i added the FormHttpMessageConverter to ahead and it works well.
<T> JuheResult<T> postForm(final String url, final MultiValueMap<String, Object> body) {
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<>(body, headers);
return exchange(url, HttpMethod.POST, requestEntity);
}
<T> JuheResult<T> exchange(final String url, final HttpMethod method, final HttpEntity<?> requestEntity) {
ResponseEntity<JuheResult<T>> response = restTemplate.exchange(url, method, requestEntity,
new JuheResultTypeReference<>());
logger.debug("调用结果 {}", response.getBody());
return response.getBody();
}
public JuheSupplierServiceImpl(RestTemplateBuilder restTemplateBuilder) {
Duration connectTimeout = Duration.ofSeconds(5);
Duration readTimeout = Duration.ofSeconds(5);
restTemplate = restTemplateBuilder.setConnectTimeout(connectTimeout).setReadTimeout(readTimeout)
.additionalInterceptors(interceptor()).build();
restTemplate.getMessageConverters().add(0, new FormHttpMessageConverter());
}
fastjson prevent resttemplate converting other mediaTypes other than json

Issue When Consume Rest Service with RestTemplate in Desktop App

I have a problem when Consume Rest Service with RestTemplate in Desktop App whereas the problem doesn't appear when i use in Web app.
This Is the Debugging logs
15:30:40.448 [main] DEBUG o.s.web.client.RestTemplate - Reading [java.util.List] as "application/json" using [org.springframework.http.converter.json.MappingJacksonHttpMessageConverter#98adae2]
15:30:40.452 [main] DEBUG httpclient.wire.content - << "[{"name":"Indonesia","id":1},{"name":"AlaySia","id":2},{"name":"Autraliya","id":3}]"
Exception in thread "main" java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to com.mgm.domain.Country
And this is the Code that i use.
String url = "http://localhost:8080/mgm/country";
List<MediaType> mediaTypes = new ArrayList<MediaType>();
mediaTypes.add(MediaType.APPLICATION_JSON);
HttpHeaders headers = new HttpHeaders();
headers.setAccept(mediaTypes);
HttpEntity<Country> httpEntity = new HttpEntity<Country>(null, headers);
try {
ResponseEntity<List> responseEntity = restTemplate.exchange(url, HttpMethod.GET, httpEntity, List.class);
List<Country> countries = responseEntity.getBody();
System.out.println(countries.get(0).getName());
} catch (RestClientException exception) {
exception.printStackTrace();
}
Code above doesn't give errors when i place it in web app. I use Spring Rest MVC to Provide JSON and Consume it with RestTemplate.
I think there is a problem when Jackson Convert java.util.LinkedHashMap to Country . it Seems that countries.get(0) actually has LinkedHashMap type not Country and problem will appeared when i invoke one of Country methode like .getName()

Try using an array instead:
String url = "http://localhost:8080/mgm/country";
List<MediaType> mediaTypes = new ArrayList<MediaType>();
mediaTypes.add(MediaType.APPLICATION_JSON);
HttpHeaders headers = new HttpHeaders();
headers.setAccept(mediaTypes);
HttpEntity<Country> httpEntity = new HttpEntity<Country>(null, headers);
try {
ResponseEntity<Country[]> responseEntity = restTemplate.exchange(url, HttpMethod.GET, httpEntity, Country[].class);
Country[] countries = responseEntity.getBody();
System.out.println(countries[0].getName());
} catch (RestClientException exception) {
exception.printStackTrace();
}