# java.lang.ClassNotFoundException: null

**URL:** https://community.gatling.io/t/java-lang-classnotfoundexception-null/6968
**Category:** Gatling (Open-Source)
**Created:** [July 26, 2022, 10:43am UTC](https://community.gatling.io/t/java-lang-classnotfoundexception-null/6968 "2022-07-26T10:43:56Z")
**Posts on this page:** 1
**Showing post:** 18

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### Author: ![slandelle](https://dub1.discourse-cdn.com/flex013/user_avatar/community.gatling.io/slandelle/32/4_2.png) [@slandelle](https://community.gatling.io/u/slandelle)
#### Post date: [August 5, 2022, 7:43am UTC](https://community.gatling.io/t/java-lang-classnotfoundexception-null/6968/18 "2022-08-05T07:43:35Z")

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There’s nothing we can do with this Docker image, it’s a third party.  
We can only help and investigate problems with pure Gatling official components.  
If you can reproduce your issue with the Gatling bundle on a Linux box and provide a procedure, we’ll be able to help.  
Otherwise, please directly reach out to this Docker image’s author.

Also, it would have saved a lot of time to everyone trying to help you if you had explained you were using a third party Docker image in the first place. That’s why we require a reproducer [as explained here](https://community.gatling.io/t/how-to-ask-a-question/6538).

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