Empty JSON returned when trying to use @GetMapping to an API in Spring Java

Question

I have @Bean with a logger that returns the JSON data it gets from a JIRA API. I'm currently logging my response while starting the program. Now I want to start using @GetMapping in my controller and want to log the info whenever I do a GET request on localhost:8080/ .

This is my @Bean in Controller class, which I want to change to @GetMapping

  @Bean
    public CommandLineRunner run(RestTemplate restTemplate) throws Exception {
        return args -> {
            IssuesList response = restTemplate.getForObject(
                    "https://.../rest/api/2/search?jql=project="+projectId+" AND status in (done) AND issueType in (Story)&expand=changelog",
                    IssuesList.class);


            List<Issues> issuesData = response.getIssuesList();

            log.info(issuesData.toString());
        };
    }

This is my RestTemplate @Bean

    @Bean
    public RestTemplate restTemplate(RestTemplateBuilder builder) {
        return builder.basicAuthentication(auth,auth2).build();
    }

This is the response I get when I start the program

[{key= 'PE-1322', fields= {storyPoints= '3', issueType= 'Story', created= '2020-11-18T09:16:55.816+0000'}}]

I tried changing @Bean at CommandLineRunner to @GetMapping but when I do that, I only get this response.

2021-01-15 16:08:59.261  INFO 36704 --- [nio-8080-exec-2] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2021-01-15 16:08:59.261  INFO 36704 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2021-01-15 16:08:59.261  INFO 36704 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : Completed initialization in 0 ms

And at localhost:8080 I get an empty JSON {}.

#EDIT: This is my full controller class:

@RestController
public class Controller {

    private String auth = "...";
    private String auth2 = "...";
    private String projectId = "...";


    @Bean
    public RestTemplate restTemplate(RestTemplateBuilder builder) {
        return builder.basicAuthentication(auth,auth2).build();
    }

    @Bean
    public CommandLineRunner run(RestTemplate restTemplate) throws Exception {
        return args -> {
            IssuesList response = restTemplate.getForObject(
                    "https://.../rest/api/2/search?jql=project="+projectId+" AND status in (done) AND issueType in (Story)&expand=changelog",
                    IssuesList.class);


            List<Issues> issuesData = response.getIssuesList();

            log.info(issuesData.toString());
        };
    }
}

This is the edited version with @GetMapping

@RestController
public class Controller {

    private String auth = "...";
    private String auth2 = "...";
    private String projectId = "...";
    private static final Logger log = LoggerFactory.getLogger(KpiMetricsApplication.class);


    @Bean
    public RestTemplate restTemplate(RestTemplateBuilder builder) {
        return builder.basicAuthentication(auth,auth2).build();
    }

    @GetMapping("/")
    public String run(RestTemplate restTemplate) throws Exception {
            IssuesList response = restTemplate.getForObject(
                    "https://.../rest/api/2/search?jql%3Dproject%3D"+projectId+"%20AND%20status%20in%20(done)%20AND%20issueType%20in%20(Story)&expand%3Dchangelog",
                    IssuesList.class);


            List<Issues> issuesData = response.getIssuesList();

            return issuesData.toString();
    }
}

---

#Final Edit

Thanks to @sarcode, I did it. Here is my updated class:

I made a Resttemplate config class first:

@Configuration
@Slf4j
public class RestConfig {

    private String auth = "...";
    private String auth2 = "...";

    @Bean
    public RestTemplate restTemplate(RestTemplateBuilder builder) {
        return builder.basicAuthentication(auth,auth2).build();
    }

    @Bean
    public CommandLineRunner startup() {
        return args -> {
            log.info("**************************************");
            log.info("    Configuring with RestTemplate");
            log.info("**************************************");
        };
    }
}

And updated my controller class like this, the thing that made it work was the @Autowired annotation.

@RestController
public class Controller {

    private static final Logger log = LoggerFactory.getLogger(KpiMetricsApplication.class);


    private String projectId = "...";

    @Autowired
    private RestTemplate rest = new RestTemplate();


    @GetMapping("/")
    public String run() throws Exception {
            IssuesList response = rest.getForObject(
                    "https://.../rest/api/2/search?jql=project="+projectId+ " AND status in (done) AND issuetype in (Story)&expand=changelog",
                    IssuesList.class);


            List<Issues> issuesData = response.getIssuesList();

            log.info(issuesData.toString());
            return response.toString();
    }
}

Answer 1

You will need a simple RestController with a @GetMapping as you said.

@RestController
public class SimpleController {

   

    @GetMapping("/")
    public String check() {
        IssuesList response = restTemplate.getForObject(
                "https://.../rest/api/2/search?jql=project="+projectId+" AND status in (done) AND issueType in (Story)&expand=changelog",
                IssuesList.class);


        List<Issues> issuesData = response.getIssuesList();
        return issuesData.toString();

    }
}

As a side note, I would recommend placing your RestTemplate Config somewhere else.

Answer 2

In order to log HTTP Request/Response, Could you re-configure RestTemplate by attached link ? Spring RestTemplate - how to enable full debugging/logging of requests/responses?

It will be helpful for you.