joda.time.DateTime deserialization error

Question

I tried to deserialize a class with a DateTime as attibute:

import org.joda.time.DateTime;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.datatype.joda.deser.DateTimeDeserializer;
import com.fasterxml.jackson.datatype.joda.ser.DateTimeSerializer;

class MyClass {

    private DateTime alertTimestamp;

    private String name;

    @JsonSerialize(using = DateTimeSerializer.class)
    public DateTime getAlertTimestamp() {
        return alertTimestamp;
    }

    @JsonDeserialize(using = DateTimeDeserializer.class)
    public void setAlertTimestamp(DateTime now) {
        this.alertTimestamp = now;
    }

    //...
}

But when I try tro deserialize, I have this exception:

com.fasterxml.jackson.datatype.joda.deser.DateTimeDeserializer has no default (no arg) constructor

I use that to deserialize:

ObjectMapper mapper = new ObjectMapper();
mapper.readValue(jsonData, MyClass.class);

And an example of my jsonData:

{    
    "name":"test",
    "alertTimestamp":       {"year":2014,"era":1,"dayOfMonth":24,"dayOfWeek":1,"dayOfYear":83,"weekOfWeekyear":13,"weekyear":2014,"monthOfYear":3,"yearOfEra":2014,"yearOfCentury":14,"centuryOfEra":20,"millisOfSecond":232,"millisOfDay":45143232,"secondOfMinute":23,"secondOfDay":45143,"minuteOfHour":32,"minuteOfDay":752,"hourOfDay":12,"zone":{"uncachedZone":{"cachable":true,"fixed":false,"id":"America/Los_Angeles"},"fixed":false,"id":"America/Los_Angeles"},"millis":1395689543232,"chronology":{"zone":{"uncachedZone":{"cachable":true,"fixed":false,"id":"America/Los_Angeles"},"fixed":false,"id":"America/Los_Angeles"}},"afterNow":false,"beforeNow":false,"equalNow":true}
}

Hurless

Can you clarify timestamp vs alertTimestamp? – Few

Sorry it was a mistake – Hurless

What JSON generator generated the JSON in jsonData? DateTimeSerializer does not serialize into that format. – Few

According to this source the class DateTimeDeserializer has a public no-arg constructor. This arises the question if you have the proper import or appropriate jar-version? – Glisten

@MenoHochschild Version 2.3.0 doesn't. – Few

The data has been generated before I used the DataTimeSerialiser. I generated new data, now I have "alertTimestamp":1395775173517 but the exception is still there. – Hurless

I don't have this constructor in my DateTimeDeserializer source – Hurless

Answer 1

@JsonDeserialize expects a JsonDeserializer with a no-arg constructor. The most recent version of DateTimeDeserializer does not have such a constructor.

If you've fixed the format, ie. alertTimestamp should just be a timestamp, then you could simply register the JodaModule with the ObjectMapper. It will use DateTimeDeserializer internally for DateTime fields. You can get rid of the @JsonDeserialize annotations.

mapper.registerModule(new JodaModule());

You'll need to add the jackson-datatype-joda library.

Few

Could you please provide an example? – Plagal

@arcone What would you like an example of? – Few

I figured it out - it was a Spring response issue with DateTime. – Plagal

I've encountered a bug in GlassFish that refuses me to register the JodaModule :-( Is there another way to apply the deserialization method? – Entirely

@Entirely You'll need to register a custom deserializer for DateTime fields. – Few

I've found out that it's possible to use an older version of the library jackson-datatype-joda (v2.4.6) – Entirely