Halt does not work with JacksonJsonSupport trait mixed in

build.scala

import sbt._
import Keys._
import org.scalatra.sbt._
import org.scalatra.sbt.PluginKeys._
import com.mojolly.scalate.ScalatePlugin._
import ScalateKeys._

object JsontestservletBuild extends Build {
  val Organization = "com.nidkil"
  val Name = "json-test-servlet"
  val Version = "0.1.0-SNAPSHOT"
  val ScalaVersion = "2.11.1"
  val ScalatraVersion = "2.3.0"

  lazy val project = Project (
    "json-test-servlet",
    file("."),
    settings = ScalatraPlugin.scalatraWithJRebel ++ scalateSettings ++ Seq(
      organization := Organization,
      name := Name,
      version := Version,
      scalaVersion := ScalaVersion,
      resolvers += Classpaths.typesafeReleases,
      libraryDependencies ++= Seq(
        "org.json4s"        %% "json4s-jackson"    % "3.2.9",
        "org.scalatra"      %% "scalatra-json"     % ScalatraVersion,
        "org.scalatra"      %% "scalatra"          % ScalatraVersion,
        "org.scalatra"      %% "scalatra-scalate"  % ScalatraVersion,
        "org.scalatra"      %% "scalatra-specs2"   % ScalatraVersion   % "test",
        "ch.qos.logback"     % "logback-classic"   % "1.1.2"           % "runtime",
        "org.eclipse.jetty"  % "jetty-webapp"      % "9.1.5.v20140505" % "container",
        "org.eclipse.jetty"  % "jetty-plus"        % "9.1.5.v20140505" % "container",
        "javax.servlet"      % "javax.servlet-api" % "3.1.0"
      ),
      scalateTemplateConfig in Compile <<= (sourceDirectory in Compile){ base =>
        Seq(
          TemplateConfig(
            base / "webapp" / "WEB-INF" / "templates",
            Seq.empty,  /* default imports should be added here */
            Seq(
              Binding("context", "_root_.org.scalatra.scalate.ScalatraRenderContext", importMembers = true, isImplicit = true)
            ),  /* add extra bindings here */
            Some("templates")
          )
        )
      }
    )
  )
}

JsonTestServlet.scala

package com.nidkil.jsontest

import org.json4s.{Formats, DefaultFormats}
import org.scalatra._
import org.scalatra.json._
import scalate.ScalateSupport

class JsonTestServlet extends ScalatraServlet with JacksonJsonSupport {

  protected implicit val jsonFormats: Formats = DefaultFormats

  case class HaltBody(status: Int, msg: String)
  
  before() {
    contentType = formats("json")
  }

  get("/halt") {
    halt(502)
  }

  get("/halt-with-body") {
    halt(502, "error msg")
  }

  get("/halt-custom-body") {
    halt(502, HaltBody(502, "error msg"))
  }

}

NoJsonTestServlet.scala

package com.nidkil.jsontest

import org.scalatra._
import scalate.ScalateSupport

class NoJsonTestServlet extends ScalatraServlet {

  case class HaltBody(status: Int, msg: String)
  
  before() {
  }

  get("/halt") {
    halt(502)
  }

  get("/halt-with-body") {
    halt(502, "error msg")
  }

  get("/halt-custom-body") {
    halt(502, HaltBody(502, "error msg"))
  }

}

ScalatraBootstrap.scala

import com.nidkil.jsontest._
import org.scalatra._
import javax.servlet.ServletContext

class ScalatraBootstrap extends LifeCycle {
  override def init(context: ServletContext) {
    context.mount(new NoJsonTestServlet, "/nojson/*")
    context.mount(new JsonTestServlet, "/json/*")
  }
}