After learning about Function.chain...

gistfile1.txt

  def transform[T: TypeTag: ClassTag](json: JsValue, bean: T, overridableFieldsMap : HashMap[String, String]): JsValue = {

    val functionCalls: Seq[(JsValue) => JsValue] = typeOf[T].members.filter(!_.isPrivate)
      .filter(_.isMethod)
      .filter(_.asMethod.isAccessor)
      .filter(_.asMethod.fullName.startsWith("services."))
      .map(
        methodScope => {
          var term = methodScope.asTerm
          var mirror = runtimeMirror(bean.getClass.getClassLoader)
          val instanceMirror = mirror.reflect(bean)
          val fieldMirror = instanceMirror.reflectField(term)

          val fieldName = term.name.toString
          val displayName = overridableFieldsMap.getOrElse(fieldName, fieldName)

          (x:JsValue) => {
            transformField(x, fieldName, displayName)
          }
        }
      ).toSeq

    scala.Function.chain(functionCalls)(json)
  }