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Java - Initialize member with values from other members

I have a REST Webservice, I get my data from a JSON request:
#POST
#Path("load")
#Consumes(MediaType.APPLICATION_JSON)
#Produces(MediaType.APPLICATION_JSON)
#RequestMapping(value="load", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON, consumes = MediaType.APPLICATION_JSON)
public #ResponseBody
Respuesta loadData(#RequestBody Persons person) {
//code
em.persist(person);
}
This is my Person class:
#Entity
#Table(name = "myparenttable", schema = "myschema", catalog = "mydb")
public class Parent {
private Integer id_parent;
private String name;
private String last_name;
private String username;
//getters and setters
public Parent(){}
}
I want to generate the username member with parts of the name and last_name members; for simplicity, lets say I need the username be = name + last_name; the username member is not specified in the json request, is there a way to load a member with values of other members in the object initialization? in this case, automatic initialization with #RequestMapping and #RequestBody

passing another object into current rest service does not throw an exception

this my is rest request that is compatible for another service :
{
"fromDate": 1562773101000,
"toDate": 1563118701000,
"turnOverType": 4,
"fromAmount": 1,
"toAmount": 10000000,
"voucherDescription": null,
"articleDescription": null,
"referenceNumbers": [],
"offset": 3,
"pageSize": 20,
"iban": "BLAHBLAHBLAHBLAH"
}
and this is corresponding model that not match request :
#XmlAccessorType(XmlAccessType.FIELD)
#XmlRootElement(name = "TransferRequestInquiryFilter")
public class TransferRequestInquiryFilter implements Serializable {
#XmlElement(name = "sourceIbans")
private List<String> sourceIbans;
#XmlElement(name = "transferType")
private TransferType transferType;
#XmlElement(name = "fromTransferDate")
private Timestamp fromTransferDate;
#XmlElement(name = "toTransferDate")
private Timestamp toTransferDate;
#XmlElement(name = "fromRegistrationDate")
private Timestamp fromRegistrationDate;
#XmlElement(name = "toRegistrationDate")
private Timestamp toRegistrationDate;
#XmlElement(name = "trackingNumbers")
private List<String> trackingNumbers;
#XmlElement(name = "referenceNumbers")
private List<String> referenceNumbers;
#XmlElement(name = "transactionIds")
private List<String> transactionIds;
#XmlElement(name = "status")
private TransactionStatus status;
#XmlElement(name = "fromAmount")
private Long fromAmount;
#XmlElement(name = "toAmount")
private Long toAmount;
#XmlElement(name = "destinationIbans")
private List<String> destinationIbans;
and this is my controller ..
#RequestMapping(value = "/inquiry", method = RequestMethod.POST)
public #ResponseBody
ResponseEntity<List<ExtendedTransferRequest>> transferInquiry(#RequestBody #Valid TransferRequestInquiryFilter transferRequestInquiryFilter
, BindingResult bindingResult) {
// when validation not works return bad request
List<ErrorObject> errorObjects = requestInquiryValidator.validate(transferRequestInquiryFilter);
if (errorObjects.size() > 0) {
// just throw bad request and not detail of them
return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
}
List<ExtendedTransferRequest> extendedTransferRequestList = new ArrayList<>();
ExtendedTransferRequest extendedTransferRequest = new ExtendedTransferRequest();
List<SettlementTransaction> settlementTransactionList = settlementSearch.findSettlement(transferRequestInquiryFilter);
extendedTransferRequestList = TransferInquiryResponseMapper.INSTANCE.SettlementTransactionInquiryResponse(setlementTransactionList);
return new ResponseEntity<>(extendedTransferRequestList, HttpStatus.OK);
}
just fromAmount and toAmount fills. but i want to get an exception for this situation and throw a bad request for client. how can i do that? If I get name conflict or type conflict between rest request and model , I need to handle it and riase a bad request for client. i am using spring mvc 5 and jackson-core and jackson-databind 2.9.4

Using validation-api, annotate proper validation for fields and #validated before controller method and using #valid before RequestBody object would throw proper validation exception.

No suitable HttpMessageConverter found for response type and content type [application/json;charset=UTF-8] exception occurs

Im trying to hit Spring REST endpoint in my other module of the application. So im trying to use the REST Template to get a list of users as below :
The API request using REST Template :
public List<LeadUser> getUsersBySignUpType(String type, String id) {
String adminApiUrl = adminApiBaseUrl+"/crm/v1/users/?type="+type+"&id="+id;
RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
headers.setContentType(org.springframework.http.MediaType.APPLICATION_JSON);
HttpEntity entity = new HttpEntity(headers);
ResponseEntity<LeadUserList> response = restTemplate.exchange(
adminApiUrl, HttpMethod.GET, entity, LeadUserList.class);
return response.getBody().getUsersList();
}
LeadUserList class :
public class LeadUserList {
private List<LeadUser> usersList;
public List<LeadUser> getUsersList() {
return usersList;
}
}
LeadUser model class :
public class LeadUser {
#JsonProperty("id")
private String id;
#JsonProperty("email")
private String email;
#JsonProperty("name")
private String name;
#JsonProperty("businessName")
private String businessName;
#JsonProperty("phone")
private String phone;
#JsonProperty("address")
private String address;
#JsonProperty("createdTime")
#DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME)
private Date createdTime;
#JsonProperty("updatedTime")
#DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME)
private Date updatedTime;
#JsonProperty("bookletSignups")
private BookletSignUp bookletSignUp;
#JsonProperty("eventSignups")
private EventSignUp eventSignUp;
#JsonProperty("infoSignups")
private InfoSignUp infoSignUp;
#JsonProperty("webinarSignups")
private WebinarSignUp webinarSignUp;
public LeadUser() {
}
}
The API endpoint controller class :
#Controller
#Component
#RequestMapping(path = "/crm/v1")
public class UserController {
#Autowired
UserService userService;
#RequestMapping(value = "/users", method = GET,produces = "application/json")
#ResponseBody
public ResponseEntity<List<User>> getPartnersByDate(#RequestParam("type") String type,
#RequestParam("id") String id) throws ParseException {
List<User> usersList = userService.getUsersByType(type);
return new ResponseEntity<List<User>>(usersList, HttpStatus.OK);
}
}
Although the return type is JSON from the API endpoint im getting the above exception. What have I done wrong here?
The exception :
Could not extract response: no suitable HttpMessageConverter found for response type [class admin.client.domain.LeadUserList] and content type [application/json]

Try additional settings as follows,
httpHeaders.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON));
httpHeaders.setContentType(MediaType.APPLICATION_JSON);
Also fix your exchange call,
ResponseEntity<List<LeadUser>> response = restTemplate.exchange(
adminApiUrl, HttpMethod.GET, entity, new ParameterizedTypeReference<List<LeadUser>>(){});

Spring mvc validate a primitive with #RequestBody doesn't work

I'm trying to validate an email that I receive from the post request body but it's doesn't work !
#RequestMapping(value = "myservice/emails", method = RequestMethod.POST)
public String requestFoo(#RequestBody #Email String email) {
return email;
}
When I send a request with a string that doesn't respect the email regex the function is executed and I receive a 200 status code.
Even do I add the #Valid annotation the result is always the same.
#RequestMapping(value = "myservice/emails", method = RequestMethod.POST)
public String testValidation(#Valid #RequestBody #Email String email) {
return email;
}

Start with Spring 3.2 #RequestBody method argument may be followed by Errors object, hence allowing handling of validation errors in the same #RequestMapping :
#RequestMapping(value = "myservice/emails", method = RequestMethod.POST)
public ResponseEntity<String> testValidation(#Valid #RequestBody #Email String email, Errors errors) {
if (errors.hasErrors()) {
return ResponseEntity.badRequest().body(ValidationErrorBuilder.fromBindingErrors(errors));
}
return email;
}
And create a custom validator :
public class ValidationErrorBuilder {
public static ValidationError fromBindingErrors(Errors errors) {
ValidationError error = new ValidationError("Validation failed. " + errors.getErrorCount() + " error(s)");
for (ObjectError objectError : errors.getAllErrors()) {
error.addValidationError(objectError.getDefaultMessage());
}
return error;
}
}

Error org.springframework.web.HttpMediaTypeNotSupportedException

i have a problem with rest and method post on my controler i have this 2 class the first is user in my class user i have my class with the getters and setter and a default contructor because for the finally I would like use Hibernate .:
#Entity
#Table(name="Utilisateur") // mapping with hibernate (but not using in this situation)
public class User {
#Id
private long id;
#Column(name="nom")
private String nom;
#Column(name="prenom")
private String prenom;
#Column(name="admin")
private boolean admin;
#Column(name="actif")
private boolean actif;
#Column(name="logins")
private String logins;
#Column(name="email")
private String email;
#Column(name="naissance")
private String naissance;
#Column(name="pwd")
private String pwd;
#Column(name="compte")
private String compte;
public User(){
}
/*
with getter and setter.
*/
}
and my class controler (User controller) : is using for make the api principally post api .
#RestController
public class UserController {
#RequestMapping(
value="/api/greetings/post",
method = RequestMethod.POST,
consumes = MediaType.APPLICATION_JSON_VALUE,
produces=MediaType.APPLICATION_JSON_VALUE
)
#ResponseBody
public ResponseEntity<User> getByEmail(#RequestBody User user){
if(user==null){
return new ResponseEntity<User>(HttpStatus.INTERNAL_SERVER_ERROR);
}
return new ResponseEntity<User>(user, HttpStatus.OK);
}
and i get this erreur I am using postman for make the query and in parameter of my query I send this Json query :
{"id":"3","nom":"Gille","prenom":"Laurent","admin":"1","actif":"0","logins":"gilaur","email":""toto#hotmail.com,"naissance":"1990/09/09","pwd":"gal","compte":"autre"}
And i get this error :
{"timestamp":1457906727481,"status":415,"error":"Unsupported Media Type","exception":"org.springframework.web.HttpMediaTypeNotSupportedException","message":"Content type 'text/plain;charset=UTF-8' not supported","path":"/api/greetings/post/"}
Thank you

you are change headers content-type application/json in Postman because you try set text/plain