A Gatling-tool test case that does create/update/delete on an object, using the session userId as part of the object id. Using gatling-1.5.3.

Department.scala

package mypackage
import com.excilys.ebi.gatling.core.Predef._
import com.excilys.ebi.gatling.http.Predef._
import com.excilys.ebi.gatling.http.Headers.Names._
import akka.util.duration._
import bootstrap._

object Department {
    val departmentScn = scenario("Department CRUD")
      .exec(
        http("Create Department")
          .get("/department/add")
          .queryParam("parameters", (s:Session) => """[{"departmentName":"Perf Test Department","departmentCode":"PerfDept"""+s.userId.toString+"""","initiatorId":"MyIdHere"}]""")
          .check(status.is(200))
      )
      .pause(0 milliseconds, 5 milliseconds)
      .exec (
        http("Update Department")
          .get("/department/update")
          .queryParam("parameters", (s:Session) => """[{"departmentName":"Update name","departmentCode":"PerfDept"""+s.userId.toString+"""","initiatorId":"MyIdHere"}]""")
          .check(status.is(200))
      )
      .pause(0 milliseconds, 5 milliseconds)
      .exec (
        http("Delete Department")
          .get("/department/delete")
          .queryParam("parameters", (s:Session) => """[{"departmentCode":"PerfDept"""+s.userId.toString+"""","initiatorId":"MyIdHere"}]""")
          .check(status.is(200))
      )
}