Lift Json throws error when trying to extract to a case class that has Map[String,Any]

[swetha kasireddy]

Hi,

Lift Json is throwing error when trying to extract into a case class that has Map[String,Any]. Following is my case class, the Json that I have and the error. Any help on this is greatly appreciated.

case class TestClass(timestamp: String, test: Map[String,Any])

implicit val formats = DefaultFormats

val testVal = json.extract[TestClass]

{

"test": {

    "url": "test11",

    "pla": 2001,

    "project": "test_projectName"

  },

  "timestamp": "1530579464733"

}

net.liftweb.json.MappingException: No usable value for test

No information known about type

at net.liftweb.json.Meta$.fail(Meta.scala:227)

at net.liftweb.json.Extraction$.mkValue$1(Extraction.scala:438)

at net.liftweb.json.Extraction$.net$liftweb$json$Extraction$$build$1(Extraction.scala:385)

at net.liftweb.json.Extraction$$anonfun$15.apply(Extraction.scala:260)

at net.liftweb.json.Extraction$$anonfun$15.apply(Extraction.scala:260)

at scala.collection.immutable.List.map(List.scala:277)

at net.liftweb.json.Extraction$.instantiate$1(Extraction.scala:260)

at net.liftweb.json.Extraction$.newInstance$1(Extraction.scala:308)

at net.liftweb.json.Extraction$.net$liftweb$json$Extraction$$build$1(Extraction.scala:379)

at net.liftweb.json.Extraction$.extract0(Extraction.scala:444)

[Matt Farmer]

Hi there,

Lift-json doesn't support extracting to Map[String, Any] using the default extractors. Any doesn't have any innate type information, so lift-json balks when it encounters it in the default deserialization code. It will support extracting to Map[String, String]. If you must extract to Map[String, Any] you'll need to define a custom deserializer for the Any time and add that to your formats.

Here's the interface you'll need to define if you go that route: https://static.javadoc.io/net.liftweb/lift-json_2.12/3.3.0-RC1/net/liftweb/json/Serializer.html

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