serialization - Serializing Joda DateTime using groovy.json -

i have simple pojo class fueling want serialize json using built in groovy json library. application halts when trying serialize.

class fueling { int id; int mileage; double amount; double cost; datetime datetime; string userid; 

}

the following tests renders java.lang.stackoverflowerror:

@test void parsejoda(){     def fueling = new fueling(amount: 1.0, cost: 2.3, mileage: 123, datetime: datetime.now(datetimezone.utc));     def jsonf = jsonoutput.tojson(fueling);  } 

how can make serialization work?

edit: json data persisting , not display purpuses, actual serialization result format not important long able deserialized again

given don't care format, 1 simple workaround use maps groovy json api input/output , add in little code translate domain objects , maps.

serializing

you can use map returned getproperties as-is 2 modifications: converting datetime instance it's long millisecond representation , removing class entry (which lead memory errors me)

def serialize(){     def fueling = new fueling(amount: 1.0, cost: 2.3, mileage: 123, datetime: datetime.now(datetimezone.utc));     jsonoutput.tojson(         fueling.properties.collectentries { k, v ->              [(k): k == 'datetime' ? v.millis : v] // represent datetime milliseconds         }.findall {              it.key != 'class' // remove unnecessary 'class' property         }     )  } 

deserializing

you can pass map jsonslurper spits out directly fueling constructor slight modification of converting datetime entry long datetime instance

def deserialize() {     string json = '{"userid":null,"cost":2.3,"id":0,"datetime":1439839235603,"amount":1.0,"mileage":123}'     map props = new jsonslurper().parsetext(json)     new fueling(props.collectentries { k, v ->          [(k): k == 'datetime' ? new datetime(v) : v ] // convert datetime     }) } 

of course, there comes point when domain object tree large/complex enough warrant use of more extensible 3rd-party json library.