# Jersey not happy with kotlin 1.2.10

**URL:** <https://discuss.kotlinlang.org/t/jersey-not-happy-with-kotlin-1-2-10/5830>\
**Category:** Support\
**Created:** [December 14, 2017, 7:34pm UTC](https://discuss.kotlinlang.org/t/jersey-not-happy-with-kotlin-1-2-10/5830 "2017-12-14T19:34:11Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![mdozturk](https://avatars.discourse-cdn.com/v4/letter/m/839c29/32.png) [@mdozturk](https://discuss.kotlinlang.org/u/mdozturk)\
**Post date:** [December 14, 2017, 7:34pm UTC](https://discuss.kotlinlang.org/t/jersey-not-happy-with-kotlin-1-2-10/5830/1 "2017-12-14T19:34:11Z")

</div>

I have a web backend running jetty/jersey. When I compile it with kotlin 1.1.61, it runs without issues. If I switch kotlin to 1.2.10, I get the following error:

14:31:36 WARN Could not send response error 500: javax.servlet.ServletException: org.glassfish.jersey.server.ContainerException: java.lang.NoClassDefFoundError: kotlin/reflect/KotlinReflectionInternalError

Could you please advise?

EDIT: Nevermind, upgrading jackson fixed the issue.