# 0.19.1 Upgrade issue

**URL:** <https://discuss.elastic.co/t/0-19-1-upgrade-issue/7302>\
**Category:** Elasticsearch\
**Created:** [April 12, 2012, 4:04am UTC](https://discuss.elastic.co/t/0-19-1-upgrade-issue/7302 "2012-04-12T04:04:47Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Chris\_Rode](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/chris_rode/32/2923_2.png) [@Chris\_Rode](https://discuss.elastic.co/u/Chris_Rode)\
**Post date:** [April 12, 2012, 4:04am UTC](https://discuss.elastic.co/t/0-19-1-upgrade-issue/7302/1 "2012-04-12T04:04:47Z")

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Hey guys

Last week we upgraded our staging servers from 0.18.7 to ES 0.19.1 and  
are trying to do the same with our production servers now. We had an  
intermittent problem in staging that cleared up and went away. However  
that same error is now plaguing us in production

{0.19.1}: Initialization Failed ...

1. NoClassDefFoundError[org/elasticsearch/common/util/concurrent/  
DynamicExecutors]

ClassNotFoundException[org.elasticsearch.common.util.concurrent.DynamicExecutors]2)  
NoClassDefFoundError[org/elasticsearch/common/util/concurrent/  
DynamicExecutors]

Any ideas?

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**Author:** ![kimchy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kimchy/32/44952_2.png) [@kimchy](https://discuss.elastic.co/u/kimchy)\
**Post date:** [April 12, 2012, 9:02am UTC](https://discuss.elastic.co/t/0-19-1-upgrade-issue/7302/2 "2012-04-12T09:02:47Z")

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Check if you didn't install 0.19 "on" 0.18, also, if you have plugins, make  
sure the version you use for them is compatible with 0.19.

On Thu, Apr 12, 2012 at 7:04 AM, Chris Rode [cirode@gmail.com](mailto:cirode@gmail.com) wrote:

> Hey guys
> 
> Last week we upgraded our staging servers from 0.18.7 to ES 0.19.1 and  
> are trying to do the same with our production servers now. We had an  
> intermittent problem in staging that cleared up and went away. However  
> that same error is now plaguing us in production
> 
> {0.19.1}: Initialization Failed ...
> 
> 1. NoClassDefFoundError[org/elasticsearch/common/util/concurrent/  
> DynamicExecutors]
> 
> ClassNotFoundException[org.elasticsearch.common.util.concurrent.DynamicExecutors]2)  
> NoClassDefFoundError[org/elasticsearch/common/util/concurrent/  
> DynamicExecutors]
> 
> Any ideas?

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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 6, 2017, 3:32am UTC](https://discuss.elastic.co/t/0-19-1-upgrade-issue/7302/3 "2017-07-06T03:32:51Z")

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