Deserialize BigDecimal in scala with json4s return empty list -

given json:

{     "id": "1",     "details": [{         "tax": [{             "amount": 1         },         {             "amount": 2         }]     }] } 

i'm trying reading in way:

lazy val amounts: list[bigdecimal] = parse(json) \\ "amount" \ classof[jdecimal] 

but it's giving me empty list, while using jdouble this:

lazy val amounts: list[double] = parse(json) \\ "amount" \ classof[jdouble] 

it's giving me correct list.
how can directly read list of bigdecimals?

shortly can solve using extract method target type conversion, like:

  val amounts = parse(json) \ "details" \ "tax" \ "amount"    implicit val formats = defaultformats   val decimals = amounts.extract[list[bigdecimal]]   > list(1, 2) 

explanation:

when read amounts it's element type jint not jdecimal,

val amounts = parse(json) \ "details" \ "tax" \ "amount" > jarray(list(jint(1), jint(2)))  

as can see it's jint type amounts.

and extracting class type:

 def \[a <: jvalue](clazz: class[a]): list[a#values] =     finddirect(jv.children, typepredicate(clazz) _).asinstanceof[list[a]] map { _.values } 

it's predicating clazz, amounts's element type jint, it's return empty list.