title: gatling - composing chains and executing in sequence
body: <p>I'm trying to create multiple chains and execute them in sequence using gatling. According to the documentation, this should work since 1.3 and I'm using 2.0 but it still doesn't work for me. I get an error not found value exex.</p>
  
  <pre><code>package basic
  
  import io.gatling.core.Predef._
  import io.gatling.http.Predef._
  import scala.concurrent.duration._
  
  class BenchmarkSimulation extends Simulation {
  
    val httpConf = http
                  .baseURL("http://127.0.0.1:9001")
                  .acceptHeader("text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
                  .doNotTrackHeader("1")
                  .acceptLanguageHeader("en-US,en;q=0.5")
                  .acceptEncodingHeader("gzip, deflate")
                  .userAgentHeader("Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Firefox/31.0")
  
    val helloworld = exec(http("write-hello-world").get("/hello"))
    val datetimenow = exec(http("write-datetime-now").get("/now"))
    val scn = scenario("My Scenario").exec(helloworld, datetimenow)
  
    setUp(scn.inject(ramp(1000 users) over (10 seconds))).protocols(httpConf)
  }
  </code></pre>
  
  <p>The exact errors are something like,
  ne-api/gatling/user-files/simulations/basic/BenchmarkSimulation.scala:17: not found: value exec</p>
  
  <pre><code>00:09:39.660 [ERROR] i.g.a.ZincCompiler$ -   val helloworld = exec(http("write-hello-world").get("/hello"))
  00:09:39.661 [ERROR] i.g.a.ZincCompiler$ -                    ^
  00:09:39.663 [ERROR] i.g.a.ZincCompiler$ -
  00:09:39.663 [ERROR] i.g.a.ZincCompiler$ -   val datetimenow = exec(http("write-datetime-now").get("/now"))
  00:09:39.663 [ERROR] i.g.a.ZincCompiler$ -                     ^
  00:09:40.671 [ERROR] i.g.a.ZincCompiler$ - two errors found
  Exception in thread "main" Compilation failed
      at sbt.compiler.AnalyzingCompiler.call(AnalyzingCompiler.scala:105)
      at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:48)
      at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:41)
      at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply$mcV$sp(AggressiveCompile.scala:98)
      at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply(AggressiveCompile.scala:98)
      at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply(AggressiveCompile.scala:98)
      at sbt.compiler.AggressiveCompile.sbt$compiler$AggressiveCompile$$timed(AggressiveCompile.scala:155)
      at sbt.compiler.AggressiveCompile$$anonfun$3.compileScala$1(AggressiveCompile.scala:97)
      at sbt.compiler.AggressiveCompile$$anonfun$3.apply(AggressiveCompile.scala:138)
      at sbt.compiler.AggressiveCompile$$anonfun$3.apply(AggressiveCompile.scala:86)
      at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply(Compile.scala:30)
      at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply(Compile.scala:28)
      at sbt.inc.Incremental$.cycle(Incremental.scala:73)
      at sbt.inc.Incremental$$anonfun$1.apply(Incremental.scala:33)
      at sbt.inc.Incremental$$anonfun$1.apply(Incremental.scala:32)
      at sbt.inc.Incremental$.manageClassfiles(Incremental.scala:41)
      at sbt.inc.Incremental$.compile(Incremental.scala:32)
      at sbt.inc.IncrementalCompile$.apply(Compile.scala:25)
      at sbt.compiler.AggressiveCompile.compile2(AggressiveCompile.scala:146)
      at sbt.compiler.AggressiveCompile.compile1(AggressiveCompile.scala:70)
      at com.typesafe.zinc.Compiler.compile(Compiler.scala:161)
      at com.typesafe.zinc.Compiler.compile(Compiler.scala:142)
      at io.gatling.app.ZincCompiler$.main(ZincCompiler.scala:111)
      at io.gatling.app.ZincCompiler.main(ZincCompiler.scala)
  Exception in thread "main" org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1)
      at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:377)
      at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:160)
      at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:147)
      at io.gatling.app.ZincCompilerLauncher$.apply(ZincCompilerLauncher.scala:54)
      at io.gatling.app.SimulationClassLoader$.fromSourcesDirectory(SimulationClassLoader.scala:32)
      at io.gatling.app.Gatling$$anonfun$15.apply(Gatling.scala:171)
      at io.gatling.app.Gatling$$anonfun$15.apply(Gatling.scala:171)
      at scala.Option.getOrElse(Option.scala:120)
      at io.gatling.app.Gatling.start(Gatling.scala:171)
      at io.gatling.app.Gatling$.fromMap(Gatling.scala:59)
      at io.gatling.app.Gatling$.runGatling(Gatling.scala:80)
      at io.gatling.app.Gatling$.main(Gatling.scala:54)
      at io.gatling.app.Gatling.main(Gatling.scala)
  </code></pre>