How to return an eventTime sorted array of values for each unique grouping of (periodSeconds, cIp, csHost, requestMethod, userAgent)

beaconingFeature.scala

package com.securityx.modelfeature.resources

import javax.ws.rs.{QueryParam, GET, Produces, Path}
import scala.Array
import javax.ws.rs.core.{Response, MediaType}
import org.slf4j.{LoggerFactory, Logger}
import org.joda.time.format.{ISODateTimeFormat, DateTimeFormatter}
import org.joda.time.DateTimeZone

import com.securityx.modelfeature.dao.{FeatureDao, BeaconActivityDao}
import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.module.scala.DefaultScalaModule
import com.securityx.modelfeature.ModelFeatureConfiguration
import com.sun.corba.se.spi.activation._ActivatorImplBase


@Path ("/beaconingactivities")
@Produces(Array(MediaType.APPLICATION_JSON))
class BeaconingActivityFeature (val conf:ModelFeatureConfiguration) {

  private final val LOGGER: Logger = LoggerFactory.getLogger(classOf[BluecoatFeature])
  private val beaconingActivityDao = new BeaconActivityDao

  @GET
  @Path("/beaconingSeries")
  def getBeaconingSeries(@QueryParam("isoStartTime") isoStartTime : String,
                         @QueryParam("isoEndTime") isoEndTime : String,
                         @QueryParam("period") periodInt : Integer) = {

    val buf = beaconingActivityDao.getBeaconingSeries(isoStartTime, isoEndTime, periodInt);
    val mapper = new ObjectMapper()
    mapper.registerModule(DefaultScalaModule)


    // I want to group by these values so the key is can also serialize to a json object
    val groups = buf.groupBy(x=>List(x.get("periodSeconds"), x.get("cIp"), x.get("csHost"), x.get("requestMethod"), x.get("userAgent")))

    val groupJson = mapper.writeValueAsString(groups)
    Response.ok(groupJson).build()
  }
}

data.json

{
    "List(Some(3600), Some(45.14.1.135), Some(www.bangedup.com), Some(GET), Some(\"Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-us) AppleWebKit/125.5.5 (KHTML, like Gecko) Safari/125.11\"))": [
        {
            "sld": "bangedup.com",
            "periodSeconds": 3600,
            "cIp": "45.14.1.135",
            "confidence": 0.4,
            "csHost": "www.bangedup.com",
            "eventTime": "2014-04-08T21:00:00.000Z",
            "requestMethod": "GET",
            "interval": 12.0,
            "risk": 99.79047619047618,
            "userAgent": "\"Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-us) AppleWebKit/125.5.5 (KHTML, like Gecko) Safari/125.11\""
        }
    ],
    "List(Some(3600), Some(45.14.1.137), Some(ebay.doubleclick.net), Some(GET), Some(\"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)\"))": [
        {
            "sld": "doubleclick.net",
            "periodSeconds": 3600,
            "cIp": "45.14.1.137",
            "confidence": 0.0,
            "csHost": "ebay.doubleclick.net",
            "eventTime": "2014-04-08T22:00:00.000Z",
            "requestMethod": "GET",
            "interval": 26.0,
            "risk": 60.71428571428572,
            "userAgent": "\"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)\""
        }
    ],
    "List(Some(3600), Some(45.14.1.145), Some(cgi.ebay.com), Some(GET), Some(\"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)\"))": [
        {
            "sld": "ebay.com",
            "periodSeconds": 3600,
            "cIp": "45.14.1.145",
            "confidence": 0.0,
            "csHost": "cgi.ebay.com",
            "eventTime": "2014-04-08T22:00:00.000Z",
            "requestMethod": "GET",
            "interval": 127.0,
            "risk": 39.26732150600034,
            "userAgent": "\"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)\""
        }
    ],
    "List(Some(3600), Some(82.115.68.247), Some(-), Some(unknown), Some(-))": [
        {
            "sld": "-",
            "periodSeconds": 3600,
            "cIp": "82.115.68.247",
            "confidence": 0.8,
            "csHost": "-",
            "eventTime": "2014-04-08T21:00:00.000Z",
            "requestMethod": "unknown",
            "interval": 110.0,
            "risk": 93.64181662382177,
            "userAgent": "-"
        },
        {
            "sld": "-",
            "periodSeconds": 3600,
            "cIp": "82.115.68.247",
            "confidence": 0.0,
            "csHost": "-",
            "eventTime": "2014-04-08T22:00:00.000Z",
            "requestMethod": "unknown",
            "interval": 222.0,
            "risk": 94.52786119452786,
            "userAgent": "-"
        }
    ],
}

Group key: "Map(csHost -> Some(192.16.170.42), cIp -> Some(202.201.249.222), userAgent -> Some(-), requestMethod -> Some(POST), periodSeconds -> Some(3600))"