I’m using OpenAI API Key to connect to the spring.

My Spring Code

@Slf4j
@Service
@RequiredArgsConstructor
public class GPTServiceImpl implements GPTService {
    @Value("${open-ai-key}")
    private String token;

    public JsonNode callGPT(String userMsg) throws JsonProcessingException {
        final String url = "https://api.openai.com/v1/chat/completions";

        HttpHeaders headers = new HttpHeaders();
        headers.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON));
        headers.setContentType(MediaType.APPLICATION_JSON);
        headers.setBearerAuth(token);

        ObjectMapper objectMapper = new ObjectMapper();

        Map<String, Object> bodyMap = new HashMap<>();
        bodyMap.put("model", "gpt-3.5-turbo");

        List<Map<String, String>> messages = new ArrayList<>();

        Map<String, String> userMessage = new HashMap<>();
        userMessage.put("role", "user");
        userMessage.put("content", userMsg);
        messages.add(userMessage);

        Map<String, String> assistantMessage = new HashMap<>();
        assistantMessage.put("role", "system");
        assistantMessage.put("content", "you are a friendly ai");
        messages.add(assistantMessage);

        bodyMap.put("messages", messages);

        String body = objectMapper.writeValueAsString(bodyMap);

        HttpEntity<String> request = new HttpEntity<>(body, headers);


        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.POST, request, String.class); // error here

        return objectMapper.readTree(response.getBody());
    }

    @Override
    public ResponseEntity<?> getAssisantMsg(String userMsg) throws JsonProcessingException {
        JsonNode jsonNode = callGPT(userMsg);
        String content = jsonNode.path("choices").get(0).path("message").path("content").asText();

        return ResponseEntity.status(HttpStatus.OK).body(content);
    }

and I wrote “open-ai-key” in application-properties.

it can’t work…
Error Log
ERROR 1304 — [project] [nio-8080-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: org.springframework.web.client.HttpClientErrorException$Unauthorized: 401 Unauthorized: [no body]] with root cause

org.springframework.web.client.HttpClientErrorException$Unauthorized: 401 Unauthorized: [no body]
    at org.springframework.web.client.HttpClientErrorException.create(HttpClientErrorException.java:106) ~[spring-web-6.1.6.jar:6.1.6]
    at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:183) ~[spring-web-6.1.6.jar:6.1.6]
    at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:137) ~[spring-web-6.1.6.jar:6.1.6]
    at org.springframework.web.client.ResponseErrorHandler.handleError(ResponseErrorHandler.java:63) ~[spring-web-6.1.6.jar:6.1.6]
    at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:942) ~[spring-web-6.1.6.jar:6.1.6]
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:891) ~[spring-web-6.1.6.jar:6.1.6]
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:790) ~[spring-web-6.1.6.jar:6.1.6]
    at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:672) ~[spring-web-6.1.6.jar:6.1.6]
    at com.project.service.GPTServiceImpl.callGPT(GPTServiceImpl.java:60) ~[classes/:na]

I tried few things.

1. Initialize directly to literal in ‘private String token’ : it can work well. I can get answer from gpt.
2. Insert a literal api key value other than the ‘token’ field as a parameter for headers.setBearerAuth method : it can work well too.. I can get answer.
3. I logged the ‘token’ field to see if the value didn’t come from the ‘@Value’ annotation. : but the api key value was well put in..

how to resolve this problem?

I wonder why between @Value field and literal field come out different result? doesn’t it same?