# Jar Hell - ES1Engineer Training - Lab 2 **URL:** \ **Category:** Elastic Training\ **Created:** [April 23, 2021, 2:39am UTC](https://discuss.elastic.co/t/jar-hell-es1engineer-training-lab-2/271028 "2021-04-23T02:39:00Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Fjord4](https://avatars.discourse-cdn.com/v4/letter/f/e68b1a/32.png) [@Fjord4](https://discuss.elastic.co/u/Fjord4)\ **Post date:** [April 23, 2021, 2:39am UTC](https://discuss.elastic.co/t/jar-hell-es1engineer-training-lab-2/271028/1 "2021-04-23T02:39:00Z")
Hello, Lab 2 - the installation of elasticsearch from ssh1 fails [2021-04-23T00:09:21,542][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [server1] uncaught exception in thread [main] org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: failed to load plugin x-pack-watcher due to jar hell I am not sure what "jar hell" is though I think it is not good since it does not allow me to install ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [April 23, 2021, 3:01am UTC](https://discuss.elastic.co/t/jar-hell-es1engineer-training-lab-2/271028/2 "2021-04-23T03:01:02Z")
Welcome! Could you share the full output? JarHell indicates that a plugin tries to load a library which is already loaded but with another version or something else which conflicts. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [May 21, 2021, 3:01am UTC](https://discuss.elastic.co/t/jar-hell-es1engineer-training-lab-2/271028/3 "2021-05-21T03:01:42Z")
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