JSON parserError while creating user in Openfire through spring boot application - spring-boot

Question

In my project I have to create a chat box. For that I have to use Open-fire server. I am having the service for creating users in this server.
I am facing the problem when I am trying to access the openfire service from my spring boot application.
I am have created the model for the user also created the service and provided implementation to it.
This is my model class,
public class OpenFireUser {
private String firstname;
private String username;
private String password;
private String email;
<----getters and setters--->
}
This is my service,
public UserCreationResponse createOpenFireUser(String authorization,User createUser) {
OpenFireUser user= new OpenFireUser();
user.setEmail(createUser.getEmail());
user.setFirstname(createUser.getFirstname().toLowerCase());
user.setPassword("Passw0rd");
user.setUsername(createUser.getUsername().toLowerCase());
UserCreationResponse response=new UserCreationResponse();
RestTemplate restTemplate = new RestTemplate();
try{
MultiValueMap<String, String> headers = new LinkedMultiValueMap<String, String>();
headers.add("Authorization", authorization);
headers.add("Content-Type", "application/json");
headers.add("Accept", "application/json");
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
HttpEntity<OpenFireUser> requestObject = new HttpEntity<OpenFireUser>(user, headers);
ResponseEntity<String> responseEntity=restTemplate.postForEntity(OPENFIRE_REST_ENDPOINT, requestObject,String.class);
int statusCode = responseEntity.getStatusCodeValue();
if(statusCode==201){
response.setResponseCode(statusCode);
return response;
}else{
response.setResponseCode(MessageConstant.ResponseCode.ProcessFail.value());}
return response;
}catch(HttpClientErrorException clientErr){
response.setUserMessage(clientErr.getMessage());
response.setResponseCode(clientErr.getStatusCode().value());
response.setResponseMessage(MessageConstant.CodeMessage.ProcessFail.value());
return response;
}
catch(Exception e)
{
response.setResponseCode(MessageConstant.ResponseCode.ProcessFail.value());
response.setResponseMessage(MessageConstant.CodeMessage.ProcessFail.value());
return response;
}
}
This is controller code for calling service,
#RequestMapping(value = "/createOpenFireUser", method = RequestMethod.POST, consumes = "application/json;charset=UTF-8",produces = "application/json;charset=UTF-8")
public UserCreationResponse createOpenFireUser(#RequestBody User createUser) {
logger.debug("Entering inside createOpenFireUser(#RequestBody OpenFireUser createUser) method");
//logger.debug("Create user request : {}" , createUserRequestEntity);
return userService.createOpenFireUser("authorizationKey",createUser);
}
while sending data from postman I am getting error like,
Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Can not deserialize instance of com.exelatech.printshop.model.User out of START_ARRAY token; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of com.exelatech.printshop.model.User out of START_ARRAY token
at [Source: java.io.PushbackInputStream#6c88daca; line: 1, column: 1]
2018-07-20 15:59:13.535 WARN 9988 --- [nio-9090-exec-2] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved exception caused by Handler execution: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Can not deserialize instance of model.User out of START_ARRAY token; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of model.User out of START_ARRAY token
at [Source: java.io.PushbackInputStream#6c88daca; line: 1, column: 1]
On postman I am getting response like,
"timestamp": 1532082553781,
"status": 400,
"error": "Bad Request",
"exception": "org.springframework.http.converter.HttpMessageNotReadableException",
"message": "JSON parse error: Can not deserialize instance of model.User out of START_ARRAY token; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of model.User out of START_ARRAY token\n at [Source: java.io.PushbackInputStream#6c88daca; line: 1, column: 1]",
Can anyone help me to solve my issue?

Answer 1

Error was in sending object through postman.
Previously I was sending request object like,
[
{
"firstname" : "Jyoti",
"username" : "JyotiNH",
"password":"Passw0rd",
"email" : "jyoti.kanor#exelaonline.com"
}
]
which is object.
But my method receiving parameter as array of strings,
So when I sent request with object like following structure, it successfully created the user.
{
"firstname" : "Jyoti",
"username" : "JyotiNH",
"password":"Passw0rd",
"email" : "jyoti.kanor#exelaonline.com"
}