# ES 5 Missing Log4j

**URL:** <https://discuss.elastic.co/t/es-5-missing-log4j/54785>\
**Category:** Elasticsearch\
**Created:** [July 5, 2016, 11:42pm UTC](https://discuss.elastic.co/t/es-5-missing-log4j/54785 "2016-07-05T23:42:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![mitchswaldman](https://avatars.discourse-cdn.com/v4/letter/m/b2d939/32.png) [@mitchswaldman](https://discuss.elastic.co/u/mitchswaldman)\
**Post date:** [July 5, 2016, 11:42pm UTC](https://discuss.elastic.co/t/es-5-missing-log4j/54785/1 "2016-07-05T23:42:00Z")

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Hello!

Is ES 5 missing log4j? When I try to load ESLogger in my project, I get a NoClassDefFoundError saying ESLogger is missing the dependency org/apache/log4j/priority. The documentation says ES ships with log4j, so I'm confused why it's missing this dependency. Thank you!

Cheers,  
Mitch

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**Author:** ![jasontedor](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jasontedor/32/66992_2.png) [@jasontedor](https://discuss.elastic.co/u/jasontedor)\
**Post date:** [July 6, 2016, 2:28am UTC](https://discuss.elastic.co/t/es-5-missing-log4j/54785/2 "2016-07-06T02:28:33Z")

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> [@mitchswaldman](#):
>
> Is ES 5 missing log4j?

No, but do note that it's an optional dependency so you have to explicitly pull it in.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 5, 2017, 10:37pm UTC](https://discuss.elastic.co/t/es-5-missing-log4j/54785/3 "2017-07-05T22:37:45Z")

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