# Unable to open on Jabref on Windows 10 64-bit Machine

**URL:** <https://discourse.jabref.org/t/unable-to-open-on-jabref-on-windows-10-64-bit-machine/895>\
**Category:** Help\
**Created:** [November 9, 2017, 3:08pm UTC](https://discourse.jabref.org/t/unable-to-open-on-jabref-on-windows-10-64-bit-machine/895 "2017-11-09T15:08:42Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![wanii](https://avatars.discourse-cdn.com/v4/letter/w/35a633/32.png) [@wanii](https://discourse.jabref.org/u/wanii)\
**Post date:** [November 9, 2017, 3:08pm UTC](https://discourse.jabref.org/t/unable-to-open-on-jabref-on-windows-10-64-bit-machine/895/1 "2017-11-09T15:08:43Z")

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Hi all,

I was using Jabref smoothly, but after I update my Java environment. When I click on Jabref it does not start.  
I was using Jabref 4 64-bit for windows.

Any kind of help will be highly appreciated.

Thanks  
wani

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**Author:** ![tobiasdiez](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.jabref.org/tobiasdiez/32/340_2.png) [@tobiasdiez](https://discourse.jabref.org/u/tobiasdiez)\
**Post date:** [November 10, 2017, 12:35am UTC](https://discourse.jabref.org/t/unable-to-open-on-jabref-on-windows-10-64-bit-machine/895/2 "2017-11-10T00:35:36Z")

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Chances are that you upgraded to java 9. JabRef not yet works with this new version and requires Java 8. If a downgrade does not solve the starting problems, then try to run JabRef from the command line and report the output here.

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**Author:** ![wanii](https://avatars.discourse-cdn.com/v4/letter/w/35a633/32.png) [@wanii](https://discourse.jabref.org/u/wanii)\
**Post date:** [November 10, 2017, 3:58am UTC](https://discourse.jabref.org/t/unable-to-open-on-jabref-on-windows-10-64-bit-machine/895/3 "2017-11-10T03:58:31Z")

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Hi Tobias,  
Thanks for replying, on my query.  
I try to run JabRef from the command line with Java 9 installed on my machine. Please find the screenshot of the error I received.

Ok, I will downgrade Java 9 to 8 and share accordingly.

Regards  
John  
 ![JabRef_cmd_error](https://canada1.discourse-cdn.com/flex030/uploads/jabref/original/1X/dc1281978ecd377a6a0cc06208dcfca279f5c28d.png)

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**Author:** ![wanii](https://avatars.discourse-cdn.com/v4/letter/w/35a633/32.png) [@wanii](https://discourse.jabref.org/u/wanii)\
**Post date:** [November 10, 2017, 4:24am UTC](https://discourse.jabref.org/t/unable-to-open-on-jabref-on-windows-10-64-bit-machine/895/4 "2017-11-10T04:24:26Z")

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Hi Tobias,

I downgraded my Java environment to 8, JabRef runs smoothly now.

Thanks,  
John

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**Author:** ![tobiasdiez](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.jabref.org/tobiasdiez/32/340_2.png) [@tobiasdiez](https://discourse.jabref.org/u/tobiasdiez)\
**Post date:** [November 10, 2017, 10:07am UTC](https://discourse.jabref.org/t/unable-to-open-on-jabref-on-windows-10-64-bit-machine/895/5 "2017-11-10T10:07:41Z")

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Hi John. Good to hear!