Running gatling with or without containers produces a different result.

[stefjoosten]

I am trying to reproduce my gatling simulation inside a docker container. However I get different results with and without a container.

Without containers I get a correct simulation, while using openjdk version "17.0.1" 2021-10-19 and gatling version 3.7.2:

GATLING_HOME is set to /Users/sjo00577/git/RAP/gatling-3-7-2
RAPtest is the only simulation, executing it.
Select run description (optional)
12:42:47.629 [WARN ] i.g.c.s.e.ElCompiler$ - You're still using the deprecated ${} pattern for Gatling EL. Please use to the #{} pattern instead.
n=67 offset=0 test=true char=/
n=67 offset=67 test=false char=/
n=83 offset=76 test=true char=/

<leaving out a large chunk of log file, picking up on results to show that it has worked>

================================================================================
2022-01-06 12:43:48                                          59s elapsed
---- Requests ------------------------------------------------------------------
> Global                                                   (OK=31     KO=1     )
> Home                                                     (OK=1      KO=0     )
> Home Redirect 1                                          (OK=1      KO=0     )
> polyfill.min.js                                          (OK=1      KO=0     )
> ampersand.min.css?2007197015985610770                    (OK=1      KO=0     )
> project.min.css?2007197015985610770                      (OK=1      KO=0     )
> project.min.js?2007197015985610770                       (OK=1      KO=0     )
> ampersand.min.js?2007197015985610770                     (OK=1      KO=0     )
> lib.min.css?2007197015985610770                          (OK=1      KO=0     )
> logo-ou.png                                              (OK=1      KO=0     )

<leaving out a small chunk of log file, picking it up at the end to show that it terminates properly>

================================================================================

Reports generated in 0s.
Please open the following file: /Users/sjo00577/git/RAP/gatling-3-7-2/results/raptest-20220106114247711/index.html

However, the denvazh/gatling image does not work. That image uses gatling vs. 3.2.1, so I took the Dockerfile and adapted it to work with gatling vs. 3.7.2 to see if the version difference can explain the result. Unfortunately, both versions produced an identical result.
This is the result I get:

RAP % docker compose logs test-elf -f
gatling  | GATLING_HOME is set to /opt/gatling
gatling  | OpenJDK 64-Bit Server VM warning: Option UseBiasedLocking was deprecated in version 15.0 and will likely be removed in a future release.
gatling  | RAPtest is the only simulation, executing it.
gatling  | Select run description (optional)
gatling  | 12:02:25.079 [ERROR] i.g.a.Gatling$ - Run crashed
gatling  | java.lang.NullPointerException: Cannot invoke "String.trim()" because the return value of "scala.io.StdIn$.readLine()" is null
gatling  |      at io.gatling.app.Selection$Selector.askRunDescription(Selection.scala:141)
gatling  |      at io.gatling.app.Selection$Selector.$anonfun$selection$5(Selection.scala:61)
gatling  |      at scala.Option.getOrElse(Option.scala:201)
gatling  |      at io.gatling.app.Selection$Selector.selection(Selection.scala:61)
gatling  |      at io.gatling.app.Selection$.apply(Selection.scala:36)
gatling  |      at io.gatling.app.Runner.run0(Runner.scala:61)
gatling  |      at io.gatling.app.Runner.run(Runner.scala:49)
gatling  |      at io.gatling.app.Gatling$.start(Gatling.scala:87)
gatling  |      at io.gatling.app.Gatling$.fromArgs(Gatling.scala:49)
gatling  |      at io.gatling.app.Gatling$.main(Gatling.scala:38)
gatling  |      at io.gatling.app.Gatling.main(Gatling.scala)
gatling  | Exception in thread "main" java.lang.NullPointerException: Cannot invoke "String.trim()" because the return value of "scala.io.StdIn$.readLine()" is null
gatling  |      at io.gatling.app.Selection$Selector.askRunDescription(Selection.scala:141)
gatling  |      at io.gatling.app.Selection$Selector.$anonfun$selection$5(Selection.scala:61)
gatling  |      at scala.Option.getOrElse(Option.scala:201)
gatling  |      at io.gatling.app.Selection$Selector.selection(Selection.scala:61)
gatling  |      at io.gatling.app.Selection$.apply(Selection.scala:36)
gatling  |      at io.gatling.app.Runner.run0(Runner.scala:61)
gatling  |      at io.gatling.app.Runner.run(Runner.scala:49)
gatling  |      at io.gatling.app.Gatling$.start(Gatling.scala:87)
gatling  |      at io.gatling.app.Gatling$.fromArgs(Gatling.scala:49)
gatling  |      at io.gatling.app.Gatling$.main(Gatling.scala:38)
gatling  |      at io.gatling.app.Gatling.main(Gatling.scala)
^C^CERRO[0168] got 3 SIGTERM/SIGINTs, forcing shutdown

I have also done an experiment with the official image of openjdk version 17.0.1, to be entirely sure that gatling runs the same java as my laptop. However, the result is identical again. So it might be something different than version conflicts here...

[nptri]

hi @stefjoosten did you managed to resolve this issue ?