# Start logstash on docker -\> Could not find or load main class org

**URL:** https://discuss.elastic.co/t/start-logstash-on-docker-could-not-find-or-load-main-class-org/358906
**Category:** Logstash
**Tags:** docker
**Created:** [May 7, 2024, 8:43am UTC](https://discuss.elastic.co/t/start-logstash-on-docker-could-not-find-or-load-main-class-org/358906 "2024-05-07T08:43:06Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![INS](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ins/32/92827_2.png) [@INS](https://discuss.elastic.co/u/INS)
#### Post date: [May 7, 2024, 8:43am UTC](https://discuss.elastic.co/t/start-logstash-on-docker-could-not-find-or-load-main-class-org/358906/1 "2024-05-07T08:43:06Z")

</div>

Hi  
I'm struggling the case after upgrade from logstash 8.2.1 to 8.13.3  
with

```auto
Using bundled JDK: /usr/share/logstash/jdk
Error: Could not find or load main class org.logstash.launchers.JvmOptionsParser
Caused by: java.lang.ClassNotFoundException: org.logstash.launchers.JvmOptionsParser

```

what's wrong ???