Write a map with key as int to json in scala using json4s -


i trying write map in key int json string not able so:

import org.json4s._ import org.json4s.jackson.jsonmethods._ import org.json4s.jsondsl._   object myobject {    def main(args: array[string]) {    // works fine   //val mymap = map("a" -> list(3,4), "b" -> list(7,8))    // not work     val mymap = map(4 -> map("a" -> 5))      val jsonstring = pretty(render(mymap))      println(jsonstring)  }

i receiving following error:

[error] /my_stuff/my_file.scala:14: overloaded method value render alternatives: [error]   (value: org.json4s.jvalue)org.json4s.jvalue <and> [error]   (value: org.json4s.jvalue)(implicit formats: org.json4s.formats)org.json4s.jvalue [error]  cannot applied (scala.collection.immutable.map[int,scala.collection.immutable.map[string,int]]) [error]   val jsonstring = pretty(render(mymap)) [error]                           ^ [error] 1 error found [error] (compile:compileincremental) compilation failed

i vaguely understand error message, looks render expects jvalue input, , not providing it, don't first case either, , code works expect.

how write such map json string?

edit: source of confusion

i python programmer, , in python

in [1]: import json  in [2]: wrong = {2: 5}  in [3]: open("wrong.json") f:    ...:     json.dump(wrong, f)

works fine, of course python stringifies 2.

i think expected result. if check json specification see need use strings names of elements.

so afraid need like:

 val mymap = map("4" -> map("a" -> 5))

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