POJO have null values when converting with jackson

jpganz18 :

I have tried to look for an answer on this but realized there are multiple similar but none matches this one.

I have a JSON object with this structure

{
  "model": {
     "serie" : "123456",
      "id" : "abc123"
    /// many fields
  },
  "externalModel": {
    "serie" : "123456",
    "fieldX" : "abcde"
   // many fields as well
}

and I'm doing this at my code:

 ObjectMapper mapper = new ObjectMapper();
 MyObject object = mapper.readValue(hit.getSourceAsString(), MyObject.class);

where MyObject has this form:

@JsonInclude(value = JsonInclude.Include.NON_NULL)
@JsonIgnoreProperties(ignoreUnknown = true)

public class MyObject {


    @JsonProperty("serie")
    String serie;

    @JsonProperty("id")
    Long id;

    MyObject() {}
   }

When I convert I don't get any exception, but rather I get myObject with all values set to null

I have no idea what could be wrong since no exception returned, any idea?

user7294900 :

You need to use root property model,

You can rename MyObject to MyModel and create a MyObject

@JsonInclude(value = JsonInclude.Include.NON_NULL)
@JsonIgnoreProperties(ignoreUnknown = true)
public class MyObject{
    @JsonProperty("model")
    MyModel model;
}

and then check model

Guess you like

Origin http://43.154.161.224:23101/article/api/json?id=329740&siteId=1

POJO have null values when converting with jackson

Parsing JSON using Jackson: Can we have optional variables in a POJO

Handling empty XML nodes when converting to JSON using Jackson

SpringBoot Jackson used to null values into a "" or the configuration does not return

Oracle Optimization Study Notes 01---Converting Null Values to Actual Values

Oracle Optimization Study Notes 01---Converting Null Values to Actual Values

Ignore trailing NULL characters when converting string from char array

When the jackson entity is converted to json, it is NULL and does not participate in the serialization summary

When the jackson entity is converted to json, it is NULL and does not participate in the serialization summary

When Oracle order by is sorted, null values are ranked first (nulls first)

JasperReports - JSON Data Report Shows Null Values when run in Java

sql null values will also be filtered when using not equals condition

When values() and annotate() are combined into a group by, the values must come before the annotate, and the order will have no effect.

SQL pitfall avoidance: Have you avoided pitfalls when in and not in encounter null?

Converting a list of object values to group

JUnit5 - @CsvSource - converting source to POJO

There is "\" when converting JSONObject to String

Jackson @JsonFormat converting date with incorrect timezone

Jackson serialization ignore negative values

How to convert map of maps to POJO using Jackson

Adding a dynamic json property as java pojo for jackson

Json to Java POJO with Jackson API Hangaouts

Jackson: deserialize custom attributes in XML to POJO

Jackson custom filter with full POJO data bind

sql statement is used in, when not in the query, pay attention to conditions in a range of matters dealt with null values

Why Java allows to fire property change when old and new values are null

Why do you have to use strcpy or assign values one by one when the array is initialized without assignment?

Elasticsearch的null values

python list of null values

SQL handles null values