Jackson JSON Date Deserialization to Timestamp

Question

I am trying to map a JSON to POJO using Jackson2 for my REST method. The DueDate attribute in my POJO is of type java.util.date. I read that Jackson will deserialize JSON to timestamp by default. I want this behavior only. However, Jackson is converting the dueDate attribute to Date in my case.

Could anyone help me how to make Jackson deserialize the dueDate as timestamp.

JSON here ...

{ "atr1": null, "atr2": null, "dueDate": "2018-07-11" }

POJO here ..

public class Sample {
    private String atr1;
    private String atr1;
    private Date dueDate;
}

REST Api ...

    public Response create(String json) {                                        
            ObjectMapper mapper = new ObjectMapper();
            Sample sample1 = mapper.readValue(json,Sample.class);
 }

Thanks

More details... the value type of DueDate when the method is called from the actual UI object is Timestamp

object

However, when the JSON is passed to REST for the method call, the type changes to Date.

I want it to be Timestamp type. Because of this the SQL query which uses the dueDate as parameter doesn't fetch value properly.

What do you mean by timestamp? And how is it getting deserialized now? — curlyBraces, Sep 13 '18 at 03:01
@curlyBraces I have updated the description..Hope it makes my question more clear ! — BB8, Sep 13 '18 at 03:15
If you want the value to be `Timestamp`, declare the field as `Timestamp`. — Andreas, Sep 13 '18 at 03:42
Unfortunately I cannot change the POJO as my team does not have ownership over the code. We just control the REST methods. Thanks for your suggestions though :) — BB8, Sep 13 '18 at 05:47

score 2 · Answer 1 · answered Sep 13 '18 at 03:40

You can use java.sql.timestamp in your pojo instead of java.util.Date.

import java.sql.Timestamp;

public class sample {
    private String atr1;
    private String atr2;
    private Timestamp dueDate;
}

You can access date timestamp with the same as you are doing above. I have also make code snippet for confirmation as below.

 public static void main( String[] args ) throws JsonParseException, JsonMappingException, IOException
    {
        String json = "{ \"atr1\": null, \"atr2\": null, \"dueDate\": \"2018-07-11\" }";
        ObjectMapper mapper = new ObjectMapper();
        sample sample1 = mapper.readValue(json, sample.class);
        System.out.println(sample1.getDueDate());
    }

output of above:- 2018-07-11 05:30:00.0

score 1 · Answer 2 · answered Sep 13 '18 at 03:04

1

You can use @JsonFormat for change the json date pattern like this:

public class Sample {
    private String atr1;
    private String atr1;
    @JsonFormat(shape = JsonFormat.Shape.NUMBER)
    private Date dueDate;
}

For more information read this link:

https://www.baeldung.com/jackson-jsonformat

answered Sep 13 '18 at 03:04

Danial Jalalnouri

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Thanks for your reply. However, it doesn't help me with the type of the value ! Still the problem is not resolved – BB8 Sep 13 '18 at 03:16
What is your framework? Can i see the rest of your code? For example you can use SimpleDateFormat to change the date format. It depends on your code and version of your frameworks – Danial Jalalnouri Sep 13 '18 at 03:22

Jackson JSON Date Deserialization to Timestamp

2 Answers2