Cannot Deserialize Instance of Object Out of Start_Array Token in Spring Webservice

Cannot deserialize instance of object out of START_ARRAY token in Spring Webservice

Your json contains an array, but you're trying to parse it as an object.
This error occurs because objects must start with {.

You have 2 options:

1. You can get rid of the ShopContainer class and use Shop[] instead

   ShopContainer response  = restTemplate.getForObject(
       url, ShopContainer.class);
   

   replace with

   Shop[] response  = restTemplate.getForObject(url, Shop[].class);
   

   and then make your desired object from it.

2. You can change your server to return an object instead of a list

   return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(list);
   

   replace with

   return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(
       new ShopContainer(list));
   

Cannot deserialize instance of object out of START_ARRAY token in Spring 3 REST Webservice

Solution in a similar situation was to map to Consultant[].class
This applies if you try to deserialize a JSON array of your mapped objects.

Spring: Cannot deserialize instance of ENTITY out of START_OBJECT token

As you can see on the JSON content that you provided, a response from your method is not a list or array. It is an object.

ResponseEntity<User[]> response = restTemplate.getForEntity(
        "/users",
        User[].class
);

This will not work. You have to create a new class like this:

class Embedded {
  private List<User> users;
}
class Response {
  private Embedded _embedded;
} 

ResponseEntity<User[]> response = restTemplate.getForEntity(
        "/users",
        Response.class
);

Issue with parsing the content from JSON file with Jackson & message- JsonMappingException -Cannot deserialize as out of START_ARRAY token

Your JSON string is malformed: the type of center is an array of invalid objects. Replace [ and ] with { and } in the JSON string around longitude and latitude so they will be objects:

[
    {
        "name" : "New York",
        "number" : "732921",
        "center" : {
                "latitude" : 38.895111, 
                "longitude" : -77.036667
            }
    },
    {
        "name" : "San Francisco",
        "number" : "298732",
        "center" : {
                "latitude" : 37.783333, 
                "longitude" : -122.416667
            }
    }
]

Cannot deserialize instance of `model.UsersPajo` out of START_ARRAY token at [Source: (String)[UsersPajo{website='hildegard.org'

The issue is the following lines of code:

try {
    usersPajo = objectMapper.readValue(information, UsersPajo.class);
} catch (JsonProcessingException e) {
    e.printStackTrace();
} 

The variable information contains the following:

[UsersPajo{website='hildegard.org', address=Address{zipcode='92998- 
3874', geo=Geo{lng='81.1496', lat='-37.3159'}, suite='Apt. 556', city='Gwenborough', 
street='Kulas Light'}, phone='1-770-736-8031 x56442', name='Leanne Graham', 
company=Company{bs='harness real-time e-markets', catchPhrase='Multi-layered client-server 
neural-net', name='Romaguera-Crona'}, id=1, email='Sincere@april.biz', username='Bret'}, 
UsersPajo{website='anastasia.net', address=Address{zipcode='90566-7771', 
geo=Geo{lng='-34.46"....

Which basically is the usersPajos2 mapped to a String. This obviously can't be deserialized into a single UsersPajo instance. So get rid of these lines of code and keep all others:

public static String readUserFile(String titleFile) {
    String pathJSONFile = "src/main/resources/" + titleFile + ".json";
    ObjectMapper objectMapper = new ObjectMapper();
    File jsonFile = new File(pathJSONFile);
    UsersPajo[] usersPajos2= null;

    try {
        usersPajos2 = objectMapper.readValue(jsonFile, UsersPajo[].class);
        System.out.println("_usersPajos2___" + usersPajos2);
    } catch (JsonProcessingException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    return Arrays.toString(usersPajos2);
}

object out of START_ARRAY token in Spring resttemplate

I got it weeks ago, and I feel that I should post my solution here for future use.

My JSON Response structure is a list of key value pairs, so what I did is

List<HashMap<String,String>> map=restTemplate.porsForObject(url,mvm,List.class);

The JSON response was converted into a map. So it is easy now to access the data by doing this.

String data= (Hashmap) map.get(position).get(key);

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