# ODK Briefcase not running with JDK 9 **URL:** \ **Category:** Support\ **Tags:** odk-briefcase\ **Created:** [October 12, 2017, 9:24am UTC](https://forum.getodk.org/t/odk-briefcase-not-running-with-jdk-9/10201 "2017-10-12T09:24:05Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Musashi\_Fujimura](https://getodk.b-cdn.net/letter_avatar_proxy/v4/letter/m/6a8cbe/32.png) [@Musashi\_Fujimura](https://forum.getodk.org/u/Musashi_Fujimura)\ **Post date:** [October 12, 2017, 9:24am UTC](https://forum.getodk.org/t/odk-briefcase-not-running-with-jdk-9/10201/1 "2017-10-12T09:24:05Z")
**What is the problem? Please be detailed.** I couldn't start operation of ODK Briefcase. Every time I try to open ODK Briefcase, " **The Java JAR file "ODK Briefcase v1.8.0 Production.jar**" could not be launched." shows up. I have no idea what is going on. I downloaded JDK 9 to operate ODK Briefcase, but it seems this is not working properly. I would like to ask you to how I can solve this problem? I am using mac os. **What ODK tool and version are you using? And on what device and operating system version?** ODK Briefcase and JDK 9 **What steps can we take to reproduce the problem?** **What you have you tried to fix the problem?** **Anything else we should know or have? If you have a test form or screenshots or logs, attach here.** ---
**Author:** ![abdoul](https://getodk.b-cdn.net/user_avatar/forum.getodk.org/abdoul/32/16916_2.png) [@abdoul](https://forum.getodk.org/u/abdoul)\ **Post date:** [October 12, 2017, 10:23am UTC](https://forum.getodk.org/t/odk-briefcase-not-running-with-jdk-9/10201/2 "2017-10-12T10:23:01Z")
Hello, you should try to see if your java is working well, go to command line and verify it. I'm not a Mac user but try This opens a command-line t and type 'java -version' at the prompt (without quotes) you should see something like: ``` java version "X.X.X_X" Java(TM) SE Runtime Environment (build X.X.X_X Y). ``` If it doesn't work, you may need to set up you environment path by looking [here](http://www.sajeconsultants.com/how-to-set-java_home-on-mac-os-x/) or searching in Google. ---
**Author:** ![yanokwa](https://getodk.b-cdn.net/user_avatar/forum.getodk.org/yanokwa/32/1695_2.png) [@yanokwa](https://forum.getodk.org/u/yanokwa)\ **Post date:** [October 19, 2017, 3:56am UTC](https://forum.getodk.org/t/odk-briefcase-not-running-with-jdk-9/10201/4 "2017-10-19T03:56:51Z")
@Musashi_Fujimura Can you try uninstalling Java 9 and installing Java 8 and see if that works? ---
**Author:** ![Musashi\_Fujimura](https://getodk.b-cdn.net/letter_avatar_proxy/v4/letter/m/6a8cbe/32.png) [@Musashi\_Fujimura](https://forum.getodk.org/u/Musashi_Fujimura)\ **Post date:** [October 22, 2017, 7:14am UTC](https://forum.getodk.org/t/odk-briefcase-not-running-with-jdk-9/10201/5 "2017-10-22T07:14:08Z")
Thank you very much for your advice. I have been trying, but it seems the JDK 9 doesn't work on my computer... ---
**Author:** ![Musashi\_Fujimura](https://getodk.b-cdn.net/letter_avatar_proxy/v4/letter/m/6a8cbe/32.png) [@Musashi\_Fujimura](https://forum.getodk.org/u/Musashi_Fujimura)\ **Post date:** [October 22, 2017, 7:39am UTC](https://forum.getodk.org/t/odk-briefcase-not-running-with-jdk-9/10201/6 "2017-10-22T07:39:30Z")
Thank you so much for your reply. Can I ask you how to uninstall? Actually I don't use programming applications at all and don't know even how to uninstall... Thank you in advance. ---
**Author:** ![iamnarendrasingh](https://getodk.b-cdn.net/user_avatar/forum.getodk.org/iamnarendrasingh/32/2593_2.png) [@iamnarendrasingh](https://forum.getodk.org/u/iamnarendrasingh)\ **Post date:** [October 22, 2017, 12:59pm UTC](https://forum.getodk.org/t/odk-briefcase-not-running-with-jdk-9/10201/7 "2017-10-22T12:59:50Z")
@Musashi_Fujimura Ways to unsinatll Java or any software from a computer machine is : From Mac : [https://www.wikihow.com/Uninstall-Programs-on-Mac-Computers](https://www.wikihow.com/Uninstall-Programs-on-Mac-Computers) From Microsoft : [https://support.microsoft.com/en-us/help/2601726](https://support.microsoft.com/en-us/help/2601726) From Linux : [https://www.howtogeek.com/229699/how-to-uninstall-software-using-the-command-line-in-linux/](https://www.howtogeek.com/229699/how-to-uninstall-software-using-the-command-line-in-linux/) In winodws computer if you want to uninstall press (Windows Key + r ) at same time then type **appwiz.cpl** in run box and click on OK. You will see control panel there. And then you can uninstall software from control panel. After uninstalling Java you need to restart your computer it doesn't matter that which OS(Windows / Linux / Mac) are you using, You need to restart your computer. Then install Java 8 which is stable for ODK from below link [http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html](http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html) Narendra ---
**Author:** ![Musashi\_Fujimura](https://getodk.b-cdn.net/letter_avatar_proxy/v4/letter/m/6a8cbe/32.png) [@Musashi\_Fujimura](https://forum.getodk.org/u/Musashi_Fujimura)\ **Post date:** [October 22, 2017, 3:27pm UTC](https://forum.getodk.org/t/odk-briefcase-not-running-with-jdk-9/10201/8 "2017-10-22T15:27:30Z")
Thank you for your advice! I made it to operate ODK finally!!!! Tons of millions of thanks! ---
**Author:** ![Musashi\_Fujimura](https://getodk.b-cdn.net/letter_avatar_proxy/v4/letter/m/6a8cbe/32.png) [@Musashi\_Fujimura](https://forum.getodk.org/u/Musashi_Fujimura)\ **Post date:** [October 22, 2017, 3:28pm UTC](https://forum.getodk.org/t/odk-briefcase-not-running-with-jdk-9/10201/9 "2017-10-22T15:28:14Z")
Thank you finally I solved it! huge appreciations! ---
**Author:** ![Musashi\_Fujimura](https://getodk.b-cdn.net/letter_avatar_proxy/v4/letter/m/6a8cbe/32.png) [@Musashi\_Fujimura](https://forum.getodk.org/u/Musashi_Fujimura)\ **Post date:** [October 22, 2017, 3:28pm UTC](https://forum.getodk.org/t/odk-briefcase-not-running-with-jdk-9/10201/10 "2017-10-22T15:28:48Z")
Thank you! I finally solved it :)!