lift json / json4s

[Georg Heiler]

Hi,

What is wrong with my JSON serialization getting started with lift's JSON library (json4s)

import org.json4s.JsonDSL._
import org.json4s.jackson.JsonMethods._
import org.json4s.{DefaultFormats, JObject}

case class CountryKPI(country_id: String, country_id3: String,
                      country_value: String, indicator_id: String,
                      indicator_value: String, value: Double)

val mycc = CountryKPI("first", "FFF", "fff", "XXX", "xxx", 4.0)

implicit val format = DefaultFormats
val extraMetadata: JObject = ("foo" -> 1.0) ~
  ("countryKPIs" -> Array[CountryKPI](mycc)) ~
  ("holidaysAT" -> Array[LocalDate](LocalDate.now))

compact(render(extraMetadata))

http://stackoverflow.com/questions/41311490/json4s-no-implicit-view-available?noredirect=1#comment69834568_41311490

Why doesn' t my code compile?

Strangely, implicit val formats = org.json4s.DefaultFormats ++ org.json4s.ext.JodaTimeSerializers.all

 doesn't seem to help

kind regards,

Georg

[Diego Medina]

Hi Georg,

I know that json4s says it's the same a lift-json, but changes are that at the very least, there are small changes, could you post a running example https://app.assembla.com/wiki/show/liftweb/Posting_example_code using lift-json ? that would helps us focus on getting your code working, vs updating your example to match lift-json and then figure out why your code isn't working.

You could clone this repo

https://github.com/lift/lift_26_sbt/tree/master/scala_211/lift_json

the lift_json project in there has a ready to run lift-json test, you could update that code with your example (because running lift-json on the sbt console doesn't always work as expected)

Thanks

Diego

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Diego Medina
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[Matt Farmer]

Hi there,

Mobile right now so this will be brief, but I wanted to add to Diego's response. Json4s has actually made pretty major changes to lift-json. The AST to class deserialization pipeline was entirely rewritten it seems. It actually breaks the ability to deserialize polymorphic types with type hints. 

I recommend switching to using lift-json - at least until that issue is fixed. 

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