How to convert Scala Map into JSON String?

Question

For example, I have this Map value in Scala:

val m = Map(
    \"name\" -> \"john doe\", 
    \"age\" -> 18, 
    \"hasChild\" -> true, 
    \"childs\" -         


        

Answer 1

One thing you can do using the Jackson library is to use a java HashMap object, instead of a Scala one. Then you can basically use the same "without success" code you already wrote.

import org.codehaus.jackson.map.ObjectMapper
val mapper = new ObjectMapper()
val jmap = new java.util.HashMap[String, Int]()
jmap.put("dog", 4)
jmap.put("cat", 1)
// convert to json formatted string
val jstring  = mapper.writeValueAsString(jmap)
println(jstring)

returns

jstring: String = {"dog":4,"cat":1}