gistfile1.scala

package com.dailyLif

import org.scalatra._
import scalate.ScalateSupport
import org.scalatra.scalate._

class DailyLifUserFilter extends ScalatraFilter /* with DatabaseInit with DatabaseSessionSupport */ with CookieSupport with FlashMapSupport with ScalateSupport {
  get("/user/login") {
    contentType = "text/html"
    templateEngine.layout("/WEB-INF/scalate/templates/login.ssp", Map("message" -> flash.getOrElse("message", "")))
  }

  post("/user/login") {
    (params("email"), params("password")) match {
      case("", "") => {
        flash("message") = "Please provide email and password to login"
        redirect("/user/login")
      }
      case(email:String, password:String) => {
        // other logic
      }
    }
  }
}

login.ssp

<%@ val message: String %>

<form method="post">
  Message: ${message}<br />
  E-mail: <input type="text" name="email" /><br />
  Password: <input type="password" name="password" /><br />
  <input type="submit" value="Login" />
</form>