# ERROR: Unknown command 'Logstash'

**URL:** <https://discuss.elastic.co/t/error-unknown-command-logstash/187620>\
**Category:** Logstash\
**Created:** [June 26, 2019, 4:06pm UTC](https://discuss.elastic.co/t/error-unknown-command-logstash/187620 "2019-06-26T16:06:47Z")\
**Posts on this page:** 1\
**Showing post:** 4

<div class="post-metadata">

**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [June 26, 2019, 5:31pm UTC](https://discuss.elastic.co/t/error-unknown-command-logstash/187620/4 "2019-06-26T17:31:40Z")

</div>

> [@Kevin\_Juliano](#):
>
> failed to coerce jdk.internal.loader.ClassLoaders$AppClassLoader to java.net.URLClassLoader\>}

Known issue. A workaround is mentioned [here](https://github.com/logstash-plugins/logstash-filter-jdbc_static/issues/47#issuecomment-496606449). Read down to the end of the thread for additional issues you might face.

---

_[View the full topic](https://discuss.elastic.co/t/error-unknown-command-logstash/187620)._