# Logstash restarts with "ConcurrentModificationException"

**URL:** <https://discuss.elastic.co/t/logstash-restarts-with-concurrentmodificationexception/278738>\
**Category:** Logstash\
**Created:** [July 15, 2021, 5:03am UTC](https://discuss.elastic.co/t/logstash-restarts-with-concurrentmodificationexception/278738 "2021-07-15T05:03:20Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![rojin](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rojin/32/97697_2.png) [@rojin](https://discuss.elastic.co/u/rojin)\
**Post date:** [July 15, 2021, 5:03am UTC](https://discuss.elastic.co/t/logstash-restarts-with-concurrentmodificationexception/278738/1 "2021-07-15T05:03:20Z")

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Hi, I have an issue with logstash restarting itself showing “ConcurrentModificationException“ error before stoping and starting again, does anyone have any idea what it might be about?

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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:** [August 12, 2021, 5:04am UTC](https://discuss.elastic.co/t/logstash-restarts-with-concurrentmodificationexception/278738/2 "2021-08-12T05:04:05Z")

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