415 Unsupported Media Type (org.springframework.web.client.HttpClientErrorException)

Question

I am new to WebServices. I am working on an application where I am using AnhularJs1.x at client side which sends data to Spring Rest Controller.

The architecture of the application is micro-services based. I am able to receive the data from angular to Front end Rest Controller which are in the same war.

From this controller I am calling a service which internally calls another micro-service which interacts with database.

When I am sending the data received in my front end controller to another micro-service I get 415 Unsupported Media Type (org.springframework.web.client.HttpClientErrorException)

Below is my front end controller which is in the same war as angularJS

@RequestMapping(value = "/servicearticles",  method = RequestMethod.POST,        produces = MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<ServiceArticle> saveData(@RequestBody      List<ServiceArticle> serviceArticleList){
    System.out.println("In savedata");
    System.out.println(serviceArticleList.toString());


    try {
        if(null != serviceArticleList && serviceArticleList.size() >0){
            serviceArticleAdminService.insertData(serviceArticleList);
        }else{
            logger.error("File is empty. No data to save");
        }

I am able to get data in this contoller : [ServiceArticle [articleId=17070, productCode=1000, productName=Business Parcel zone , zone=1], ServiceArticle [articleId=17071, productCode=1001, productName=Business Parcel zone , zone=4], ServiceArticle [articleId=17070, productCode=1012, productName=Business Parcel zone , zone=5], ServiceArticle [articleId=17070, productCode=1000, productName=Business Parcel zone , zone=1], ServiceArticle [articleId=17070, productCode=1000, productName=Business Parcel zone , zone=2]]

When I call the different microservice from my serviceImpl class I get the unsupported media type error

Code for serviceImpl class

private final String URI = "http://localhost:8082/admin/import/servicearticles";

@Override
public void insertData(List<ServiceArticle> serviceArticles) {
    logger.error("Inside insertData() in service");

    RestTemplate restTemplate = new RestTemplate();

    try {
            restTemplate.postForObject(URI, serviceArticles, ServiceArticle.class);
    } catch (ResourceAccessException e) {
        logger.error("ServiceArticleAdmin Service Unavailable.");

Below is the code for the controller in different micro-servie which maps to this call

@RequestMapping(value = "/import/servicearticles", method =    RequestMethod.POST, consumes= MediaType.APPLICATION_JSON_VALUE , produces = MediaType.APPLICATION_JSON_VALUE)
 public ResponseEntity<ServiceArticle> addAll(@RequestBody List<ServiceArticle> serviceArticles) {

    List<ServiceArticle> serviceArticlesAdded = serviceArticleAdminService.addAll(serviceArticles);

    return new ResponseEntity(serviceArticlesAdded, HttpStatus.OK);
}

I have added the below dependencies in my pom.xml

   <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.8.6</version>
    </dependency>

    <dependency>
        <groupId>com.fasterxml.jackson.dataformat</groupId>
        <artifactId>jackson-dataformat-xml</artifactId>
        <version>2.8.6</version>
    </dependency>

I have the following bean definition in my servlet-context.xml

<bean
    class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
    <property name="messageConverters">
        <list>
            <ref bean="jsonMessageConverter" />
        </list>
    </property>
</bean>

<!-- To convert JSON to Object and vice versa -->
<bean id="jsonMessageConverter"
    class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
</bean>

Please help me figure out where am I making a mistake. Is there any way I can set response type as application/json when I am invoking restTemplate.postForObject method

I verified using a REST client plugin it works there but not through my Java code. Please help.

Answer 1

It seems that Content-Type: application/json header is missing. Your method also returns a list of articles, not a single article, so the third argument in postForObject method is not correct.

The following code should do the job:

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);

HttpEntity<List<ServiceArticle>> request = new HttpEntity<>(serviceArticles, headers);

ResponseEntity<List<ServiceArticle>> response = 
    restTemplate.exchange(URI, HttpMethod.POST, request,
        new ParameterizedTypeReference<List<ServiceArticle>>() { });

Answer 2

@RestController
@RequestMapping("/db")
public class EmployeeDataServerResource {

    @Autowired
    EmployeeInterface ei;

    @PostMapping("/add")
    public EmployeeTable addEmployee(@Valid @RequestBody EmployeeTable      employeeTable) {

         ei.save(employeeTable);
         return employeeTable;
    }
}

This is my method of restController

public String onSave() {    
    try {
    EmployeeTable et = new EmployeeTable();
    et.setFirstName(firstName.getValue());
    et.setLastName(lastName.getValue());
    et.setEmail(email.getValue());
    et.setBirthdate(birthDate.getValue());
    et.setNumber(number.getValue());
    et.setPassword(pswd.getValue());
    et.setGender(rgroup.getValue());
    et.setCountry(select.getValue());
    et.setHobbiesLst(hobbies);

    String uri = "http://localhost:8090/db/add"; 
              
    HttpHeaders headers=new HttpHeaders();
    headers.set("Content-Type", "application/json");
    HttpEntity requestEntity=new HttpEntity(et, headers);

    ResponseEntity<EmployeeTable> addedRes = restTemplate.exchange(uri, HttpMethod.POST,requestEntity,EmployeeTable.class);
    return ""+addedRes.getStatusCodeValue();
      
    }catch (Exception e) {
        System.out.println(""+e.toString());
        return e.toString();
    }   
}

This is for add new employee in database using restController. It worked for me... Thanks