Here is my Json response
"postedevent": [
{
"status": "true",
"event_id": "800",
"num_of_image_event": "0",
"title": "Testy",
"photo": "http://54.200.110.49/checkplanner/img/upload/21310059819profile_image_1409303464798.png",
"event_date": "2014-08-29",
"fullDate": "Friday - August 29, 2014",
"event_from": "12:00AM",
"event_to": "12:15AM",
"city": "Ahm",
"state": "CA",
"member_id": "471",
"username": "Krishna Mohan",
"pencil": "yes",
"attend": "yes",
"company": "Development"
}
]
this is java class to get java objs from json response
public class PostedEvent {
String status;
int event_id;
int num_of_image_event;
String title;
String photo;
String event_date;
String fullDate;
String event_from;
String event_to;
String city;
String state;
String member_id;
String username;
String pencil;
String attend;
String company;
}
public class PostedEvnetsList
{
ArrayList<PostedEvent> postedevent;
}
And I am parsing in this way
InputStream is = WebResponse.getResponse(url);
ObjectMapper mapper = new ObjectMapper();
PostedEvnetsList mList = null;
mList = mapper.readValue(is,PostedEvnetsList.class);
eventList = mList.postedevent;
I am getting following parse exception
jackson.map.exc.UnrecognizedPropertyException: Unrecognized field "status" (Class com.example.jsonproforexam.PostedEvent), not marked as ignorable
I have declared same fields as in json response then why I am geting this exception
Please help
Your fields of PostedEvent and the PostedEvent field of PostedEventsList are not accessible.
You must set them as public (not recommended) or provide public getters and setters for them POJO-style.
Then Jackson will be able to de-serialize and the error will go away.
You can use the JsonProperty annotation to specify the json key
Ex:
public class PostedEvent {
#JsonProperty("status")
String status;
#JsonProperty("event_id")
String eventId;
....
....
If you have missed some fields from json in your entity class, you can use #JsonIgnoreProperties annotation to ignore the unknown fields.
#JsonIgnoreProperties(ignoreUnknown = true)
public class PostedEvent {
...
Related
I am not able to deserialize nested JSON array from response JSON using Spring Rest template.
JSON response which I am consuming is as follows
[
{
"creationTime": "2023-01-13",
"code": "456",
"cid": "123",
"priority": "CRITICAL",
"reviewDate": null,
"systemCall": [
{
"creationTime": "2023-01-13",
"status": null,
"id": "787878",
"modificationTime": "2023-01-13",
"creatorId": "ABC"
},
{
"creationTime": "2023-01-14",
"status": null,
"id": "787879",
"modificationTime": "2023-01-14",
"creatorId": "DEF"
}
],
level: "1"
}
]
And My model classes as follows
public class Resolution {
private String creationTime;
private String code;
private String cid;
private String priority;
private String reviewDate
private List<SystemCallVo> systemCall;
private String level;
public Resolution(){
}
//Getters and Settrs
}
public class SystemCallVo {
private String creationTime;
private String status;
private String id;
private String modificationTime;
private String creatorId;
public SystemCallVo(){
}
//Getters and Setters
}
public class ResolutionVo extends Resolution{
public ResolutionVo(){
}
}
I am calling my endpoint using rest template as follows.
ResponseEntity<List<ResolutionVo>> response = this.restTemplateConfig.restTemplate().exchange(builder.toUriString(), HttpMethod.POST, httpEntity, new ParameterizedTypeReference<List<ResolutionVo>>() {
}, new Object[0]);
Problem is List systemCall object is always null in response received through resttemplate even though systemCall attribute is present in JSON whenever I hit endpoint through swagger.
There is a defect in RestTemplate.exchange that prevents the deserialisation of even moderately complex JSON objects.
Read the response as a String and then deserialise to List<ResolutionVo> with an com.fasterxml.jackson.databind.ObjectMapper instance as follows:
ResponseEntity<String> response = this.restTemplateConfig.restTemplate().exchange(builder.toUriString(), HttpMethod.POST, httpEntity, String.class, new Object[0]);
String body = response.getBody();
List<ResolutionVo> value = objectMapper.readValue(body, new TypeReference<List<ResolutionVo>>() {});
I think this is a related issue.
I need to deserialize JSON to java class.
I have JSON like the following:
{
"data": {
"text": "John"
},
"fields":[
{
"id": "testId",
"name": "fieldName",
"options": {
"color": "#000000",
"required": true
}
},
{
"id": "testId",
"name": "fieldName1",
"options": {
"color": "#000000",
"required": false
}
}
]
}
and I need to deserialize this JSON (only "fields" section) to java class like the following:
public class Field {
public final String id;
public final String name;
public final String color;
public final boolean required;
}
and I need to get something like the following:
// The key is the id from field object (it can be the same in the multiple objects.)
Map<String, List<Field>> fields = objectMapper.readValue(json, Map<String, List<Field>>);
How can I do it using Jackson?
As long as jackson doesn't support #JsonWrapped, you have to use the following work around.
First you need to create a custom class which contains the fields:
public class Fields {
public List<Field> fields;
}
Depending on your ObjectMapper configuration you have to add #JsonIgnoreProperties(ignoreUnknown = true) to the Fields class, to ignore any other properties.
Next is that you have to define the nested Options class which is solely used temporarily:
public class Options {
public String color;
public boolean required;
}
And at last add this constructor to your Field class:
#JsonCreator
public Field(#JsonProperty("id") String id, #JsonProperty("name") String name, #JsonProperty("options") Options options){
this.id = id;
this.name = name;
this.color = options.color;
this.required = options.required;
}
The #JsonCreator annotation indicates to jackson that this constructor needs to be used for the deserialization. Also the #JsonProperty annotations are required as arguments to constructors and methods are not preserved in the bytecode
Then you can deserialize your json just like this:
List<Field> fields = objectMapper.readValue(json, Fields.class).fields;
How to create a POJO class Of below mentioned JSOn Structure by a REST Service. Using RestTemplate.exchange i need to parse this in my java.class file and get approved_by value and use in java code. Below is the response structure:
{
"approval_rules_overwritten": true,
"rules": [
{
"id": 1,
"name": "Test",
"rule_type": "RuleTest",
"approvals_required": 2,
"approved_by": [
{
"id": 2,
"name": "ABC",
"username": "ABC_XYZ",
"state": "active",
}
],
"approved": false
}
]
}
Did you create a class representing this JSON ?
In quick in the same class file (different classes would be best in different files)
public class Response {
private Boolean approval_rules_overwritten;
private List<Rule> rules;
public static class Rule {
private Integer id;
private String name;
private String rule_type;
private Integer approvals_required;
private List<Approval> approved_by;
private Boolean approved;
public static class Approval {
private String id;
private String name;
private String username;
private String state;
}
}
}
Also remember to add getters and setters on each class.
Now you can do your classic request:
ResponseEntity<Response> = restClient.exchange(request, Response.class);
and you would get your response.
You now only have to build your rest template and also to catch exceptions that could be thrown from the exchange request.
I'm trying to read in a somewhat complex json string and I'm having problems with nested items and how to retrieve them.
My java code looks like the following
String longJson = "{'Patient': {'Name': {'Given': 'FirstName','Family': 'LastName'},'Gender': 'Female','DOB': '1980-07-04T00:00:00.0000000','AgeInYears': 36,'MartialStatus': 'Single', 'Race': 'Race','Ethnicity': 'Ethnicity','Class': 'Inpatient','Address': {'StreetAddress': 'StreetAddress','City': 'City','State': 'State','ZipCode': 'ZipCode', 'Country': 'Country'}}}";
Gson gson = new Gson();
PrescriptionReq sample = null;
sample = gson.fromJson(longJson, PrescriptionReq.class);
String firstName = sample.getPatient().getName().getGiven();
//String firstName = sample.patient.name.getGiven();
System.out.println("Testing: "+ firstName);
When I run either approach I get a null point exception
Here is the Json in a more readable view
{
"Patient": {
"Name": {
"Given": "FirstName",
"Family": "LastName"
},
"Gender": "Female",
"DOB": "1980-07-04T00:00:00.0000000",
"AgeInYears": 36,
"MartialStatus": "Single",
"Race": "Race",
"Ethnicity": "Ethnicity",
"Class": "Inpatient",
"Address": {
"StreetAddress": "StreetAddress",
"City": "City",
"State": "State",
"ZipCode": "ZipCode",
"Country": "Country"
}
}
}
Here are my classes:
public class PrescriptionReq {
private Patient patient;
public Patient getPatient(){
return patient;
}
public class Patient {
Name name;
Address address;
public Name getName(){
return name;
}
//Other variables
}
public class Name {
private String Given;
private String Family;
public String getGiven() {
return Given;
}
public String getFamily() {
return Family;
}
}
}
I'm not sure if I am storing the json wrong or retrieving it wrong. Any help is much appreciated!
Your field names aren't matching your JSON, and hence you're getting back a PrescriptionReq object with a null patient field.
Off the top of my head, I can think of a couple ways to fix this:
Change the name of the variable to match the JSON field
public class PrescriptionReq {
// have to rename Patient class to avoid name collision
private PRPatient Patient;
...
Add a #SerializedName annotation to tell Gson what the "real" field name is
public class PrescriptionReq {
#SerializedName("Patient")
private Patient patient;
...
Of course you'll also need to do this for the name field in the Patient class, as well as anything in Address you're having problems with.
I have a JSON String as below:
{
"PhoneNumber": "0000000000",
"cart":
[
{
"Number": "1234",
"realm": "2345",
"id": "1234",
"quantity": "1"
}
],
"employeeId": "345",
"group": "10080",
"empEmail": "xyz#gmail.com",
}
How can I deserailize to an inputbean using objectmapper?
inputBean = objectMapper.readValue(json.toString(), inputBean.getClass());
I am getting error like
Can not deserialize instance of java.lang.String[]
out of START_OBJECT token\n at
What is the class of inputBean?
To deserialise that JSON you'll need the following beans:
class InputBean {
String phoneNumber;
List<Cart> cart;
String employeeId;
String group;
String empEmail;
// Getters, setters and constructor omitted for brevity
}
class Cart {
String number;
String realm;
String id;
String quantity;
// Getters, setters and constructor omitted for brevity
}
You then deserialise it with:
InputBean inputBean = objectmapper.readValue(json.toString(), InputBean.class);
You should also take a look at your JSON source material because it's inconsistent in property naming with some properties beginning with an uppercase character and some with a lowercase character.