# Error after installing version 4.2 with Java 10 (latest)

**URL:** <https://discourse.jabref.org/t/error-after-installing-version-4-2-with-java-10-latest/1134>\
**Category:** Help\
**Created:** [April 30, 2018, 12:59pm UTC](https://discourse.jabref.org/t/error-after-installing-version-4-2-with-java-10-latest/1134 "2018-04-30T12:59:18Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![pierocol](https://avatars.discourse-cdn.com/v4/letter/p/8491ac/32.png) [@pierocol](https://discourse.jabref.org/u/pierocol)\
**Post date:** [April 30, 2018, 12:59pm UTC](https://discourse.jabref.org/t/error-after-installing-version-4-2-with-java-10-latest/1134/1 "2018-04-30T12:59:18Z")

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I get this error  
 ![error](https://canada1.discourse-cdn.com/flex030/uploads/jabref/original/1X/f495c6178ee30a2d0b61e9326984016a8207030d.jpeg)  
What should I do?  
thank you very much!  
Piero

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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:** [April 30, 2018, 2:29pm UTC](https://discourse.jabref.org/t/error-after-installing-version-4-2-with-java-10-latest/1134/2 "2018-04-30T14:29:09Z")

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JabRef still needs Java 8 to run and is not yet compatible with Java 9 or 10.

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**Author:** ![pierocol](https://avatars.discourse-cdn.com/v4/letter/p/8491ac/32.png) [@pierocol](https://discourse.jabref.org/u/pierocol)\
**Post date:** [April 30, 2018, 2:56pm UTC](https://discourse.jabref.org/t/error-after-installing-version-4-2-with-java-10-latest/1134/3 "2018-04-30T14:56:00Z")

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Thanks a lot! I hope it is possible to roll back Java then…If you happen to know how to do it, I would be grateful if you shared it…  
best  
Piero

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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:** [April 30, 2018, 7:10pm UTC](https://discourse.jabref.org/t/error-after-installing-version-4-2-with-java-10-latest/1134/4 "2018-04-30T19:10:37Z")

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Sorry for my rather sparse explanation this afternoon - I was a bit in a hurry.

You can install different versions of Java in parallel and normally JabRef picks up the right version. Thus, downloading and installing Java 8 should work. If not, then you need to additionally uninstall Java 10.