如何解决“在Spring Boot中提取[class com。*类型的响应时出错”？

Question

我有一个RestController可以正常工作，因为当我直接从浏览器访问它时，它将返回一个JSON响应。但是，当我在其他有界上下文中从服务发送请求时，出现错误：

{"timestamp":1579095291446,"message":"Error while extracting response for type 
[class com.path.to.contexttwo.client.dto.WorkerDetails] and content type [application/json]; nested exception is 
org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: 
Unexpected character ('<' (code 60)): expected a valid value (JSON String, Number, Array, Object or token 'null', 'true' or 'false');
nested exception is com.fasterxml.jackson.core.JsonParseException: 
Unexpected character ('<' (code 60)): 
expected a valid value (JSON String, Number, Array, Object or token 'null', 'true' or 'false')\n at [Source: (PushbackInputStream); 
line: 1, column: 2]","details":"uri=/context-two/register-new"}

这是我的代码：

RestController

package com.path.to.contextone.aplication.presentation;

@RestController
@RequestMapping(path = "/iacess", produces = "application/json")
@CrossOrigin(origins = "*")
public class IAccessRestController {

    UserRepository userRepo;
    IAcessService iaccessService;
    EntityLinks entityLinks;

    @Autowired
    public IAccessRestController(
            UserRepository userRepo,
            IAcessService iaccessService,
            EntityLinks entityLinks) {
        this.userRepo = userRepo;
        this.iaccessService= iaccessService;
        this.entityLinks = entityLinks;
    }

    @GetMapping("/get-worker-details/{userName}")
    public WorkerDetails getWorkerDetails(@PathVariable String userName) {

        User user = userRepo.findByUsername(userName);

        WorkerDetails workerDetails = new WorkerDetails();
        workerDetails.setUserId(userId);
        workerDetails.setGender(user.gender());
        workerDetails.setFirstName(user.getFirstName());
        workerDetails.setLastName(user.getLastName());
        workerDetails.setPhoneNumber(user.getPhoneNumber());

        if (workerDetails != null) {
            return workerDetails;
        }
        return null;
    }
}

RestClient

package com.path.to.contexttwo.client;

// imports omitted, as well as other code

@Service
public class IAcessRestClientImpl implements IAcessRestClient {

    private final RestTemplate restTemplate;

    @Autowired
    public IAcessRestClientImpl(
            final RestTemplate restTemplate
    ) {
        this.restTemplate = restTemplate;
    }

    @Override
    public WorkerDetails getWorkerDetailsByName(final String userName) throws URISyntaxException {

        Map<String,String> urlVariables = new HashMap<>();
        urlVariables.put("userName", userName);
        return restTemplate.getForObject(
                "http://localhost:8080/iacess/get-worker-details/{userName}",
                WorkerDetails.class,
                urlVariables
        );
    }
}

Config

package com.path.to.contexttwo.configuration;

@Configuration
@EnableWebMvc
public class RestClientConfig {

    @Bean
    public RestTemplate restTemplate() {
        final RestTemplate restTemplate = new RestTemplate();

        List<HttpMessageConverter<?>> messageConverters = new ArrayList<>();
        MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
        List<MediaType> mediaTypes = new ArrayList<MediaType>();
        mediaTypes.add(MediaType.APPLICATION_JSON);
        converter.setSupportedMediaTypes(mediaTypes);
        messageConverters.add(converter);
        restTemplate.setMessageConverters(messageConverters);
        restTemplate.getInterceptors().add(new JsonInterceptor());

        return restTemplate;
    }
}

WorkerDetails

package com.path.to.contexttwo.client.dto;

import java.io.Serializable;
import java.util.Objects;

public class WorkerDetails implements Serializable {

    private long userId;
    private String gender;
    private String firstName;
    private String lastName;
    private String phoneNumber;

    public WorkerDetails() {
        this.userId = -1;
        this.gender = null;
        this.firstName = null;
        this.lastName = null;
        this.phoneNumber = null;
    }

    // omitted all args constructor, getters, setters, equals, hascode, toString for simplicity
}

WorkerDetails也存在于com.path.to.contextone.ohs_pl包中。

我已经尝试了三天，阅读和调试，无济于事。调试器似乎表明，RestTemplate在分析WorkerDetails.class时会发生错误。

我还尝试在所有配置类中使用ComponentScan，因为文件位于单独的程序包（有界上下文）中，但没有成功。

我可以只使用调用IAcessRestClient的类中的UserDetailsRepository来获取WorkerDetails，但这将使两个不同的有界上下文依赖于同一数据库模式。

任何帮助将不胜感激。我可以根据请求发布附加代码。

提前感谢

Answer 1

尝试：

return restTemplate.getForObject(
   "http://localhost:8080/iacess/get-worker-details/" + userName,
   WorkerDetails.class);