# Jar Hell Exception

**URL:** <https://discuss.elastic.co/t/jar-hell-exception/162824>\
**Category:** Elasticsearch\
**Created:** [January 3, 2019, 2:35pm UTC](https://discuss.elastic.co/t/jar-hell-exception/162824 "2019-01-03T14:35:39Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![RITESH\_AGARWAL](https://avatars.discourse-cdn.com/v4/letter/r/e19adc/32.png) [@RITESH\_AGARWAL](https://discuss.elastic.co/u/RITESH_AGARWAL)\
**Post date:** [January 3, 2019, 2:35pm UTC](https://discuss.elastic.co/t/jar-hell-exception/162824/1 "2019-01-03T14:35:39Z")

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Exception in thread "main" java.lang.IllegalStateException: jar hell!  
class: com.fasterxml.jackson.core.Base64Variant  
jar1: E:\elasticsearch-5.6.5\elasticsearch-5.6.5\plugins.installing-122613154582084753\jackson-core-2.8.6.jar  
jar2: E:\elasticsearch-5.6.5\elasticsearch-5.6.5\lib\jackson-core-2.8.6.jar  
at org.elasticsearch.bootstrap.JarHell.checkClass(JarHell.java:282)  
at org.elasticsearch.bootstrap.JarHell.checkJarHell(JarHell.java:192)  
at org.elasticsearch.plugins.InstallPluginCommand.jarHellCheck(InstallPluginCommand.java:558)  
at org.elasticsearch.plugins.InstallPluginCommand.verify(InstallPluginCommand.java:527)  
at org.elasticsearch.plugins.InstallPluginCommand.install(InstallPluginCommand.java:570)  
at org.elasticsearch.plugins.InstallPluginCommand.execute(InstallPluginCommand.java:218)  
at org.elasticsearch.plugins.InstallPluginCommand.execute(InstallPluginCommand.java:202)  
at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:70)  
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:134)  
at org.elasticsearch.cli.MultiCommand.execute(MultiCommand.java:69)  
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:134)  
at org.elasticsearch.cli.Command.main(Command.java:90)  
at org.elasticsearch.plugins.PluginCli.main(PluginCli.java:47)

 com.fasterxml.jackson.core jackson-databind 2.8.6 

trying to use in Custom Plugin.

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<div class="post-metadata">

**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:** [January 3, 2019, 2:49pm UTC](https://discuss.elastic.co/t/jar-hell-exception/162824/2 "2019-01-03T14:49:42Z")

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Don't ship jackson within your plugin.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 31, 2019, 2:49pm UTC](https://discuss.elastic.co/t/jar-hell-exception/162824/3 "2019-01-31T14:49:43Z")

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