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Problem in installing JATOS

Hello, I'm trying to save my open sesame experiment as an OSWeb file using JATOS.

So far, I installed Java and jotas_win_java packages by following the instructions to run it in my window, but I can't execute the loader of JATOS.

This is what I can see in my jotas_win_java folder, and I'm not sure why it's not executable. (They're still in my download folder, the location of it might be a problem?). Does anyone know how to solve this issue? Thank you.


  • Hi, from what I see in your folder structure your JATOS started normally. What happens when you open localhost:9000 in your browser? And do you get any error messages in the terminal window that opened after you clicked on loader.bat?



  • It shows me 'ERR_CONNECTION_REFUSED' and for some reasons I simply can't open loader :(

  • Sounds to me like you started several loader.bat. Or some other server is using port 9000. What happens when you open localhost:9000 in your browser?

  • Hi Kristian,

    When I put http://localhost:9000/ in my browser it shows me 'ERR_CONNECTION_REFUSED' and can't reach the site. Could you please let me know what I am missing here? Thanks so much.

  • Not sure what's going on. What's in JATOS' log. You can find them in the installation folder in logs/application.log and logs/loader.log. Are there any exceptions or errors?

  • I got:

    2021-11-19 11:33:33,716 [INFO] - g.OnStartStop - JATOS started

    2021-11-19 11:33:34,230 [INFO] - p.a.Play - Application started (Prod) (no global state)

    2021-11-19 11:33:34,648 [INFO] - p.c.s.AkkaHttpServer - Listening for HTTP on /

    but can't see anything after this, (no log for 20th and 21th) and the loader seems to open but closes itself in a second. I installed JATOS first without Java... will it be a source of a problem?

  • So JATOS started without errors. Hm. Java is not the problem - JATOS would start without it. Is there something blocking access to port 9000 on your computer? Is there maybe some kind of firewall / virus protection installed?

  • I carefully went through the documents again and solved the issue. Thanks!

  • That is nice! Do you think others could encounter the same problem? Then please consider sharing it here with us.

  • I tried to open loader with Java and couldn't open it that way but was able to open it and found an address to tryout server with command prompt.

  • Hello, could you explain me how you did it? I encounter exactly the same problem with JATOS. Thank you ^^ !

  • @Zephyr Once I downloaded the packages, I got the id and pw for JATOS (you can choose between tryout server or registration with mindprobe or with your own server) to log-in and to import the OSWeb file of my open sesame experiment. Hope it helps!

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