# Why I can see the complete stack trace in logs?

**URL:** <https://discuss.elastic.co/t/why-i-can-see-the-complete-stack-trace-in-logs/66366>\
**Category:** Elasticsearch\
**Created:** [November 17, 2016, 10:48am UTC](https://discuss.elastic.co/t/why-i-can-see-the-complete-stack-trace-in-logs/66366 "2016-11-17T10:48:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![cterron](https://avatars.discourse-cdn.com/v4/letter/c/ccd318/32.png) [@cterron](https://discuss.elastic.co/u/cterron)\
**Post date:** [November 17, 2016, 10:48am UTC](https://discuss.elastic.co/t/why-i-can-see-the-complete-stack-trace-in-logs/66366/1 "2016-11-17T10:48:02Z")

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I'm using Elasticsearch 2.3.x in an application. Sometimes, I see logs like this:  
java.lang.ClassCastException  
[2016-11-17 00:00:30,176][WARN][index.warmer] [172.16.131.181-avos] [logs-2016-11-16-23][0] warmer [warmer\_av\_h  
istogram\_ts\_1479340799999\_90] failed  
java.lang.ClassCastException  
[2016-11-17 00:00:30,176][WARN][index.warmer] [172.16.131.181-avos] [logs-2016-11-16-23][0] warmer [warner\_av\_a  
gg\_ts\_1479340799999\_180] failed  
java.lang.ClassCastException  
[2016-11-17 00:00:30,176][WARN][index.warmer] [172.16.131.181-avos] [logs-2016-11-16-23][0] warmer [warmer\_av\_h  
istogram\_ts\_1479340799999\_180] failed  
java.lang.ClassCastException

I know, warmers are deprecated, but I don't know what settings I have to put in logging.yml to show the full stack trace.

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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:** [December 15, 2016, 10:48am UTC](https://discuss.elastic.co/t/why-i-can-see-the-complete-stack-trace-in-logs/66366/2 "2016-12-15T10:48:03Z")

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