# Failed to load plugin class\[elasticsearch.authenticate.AuthenticatePlugin\]

**URL:** <https://discuss.elastic.co/t/failed-to-load-plugin-class-elasticsearch-authenticate-authenticateplugin/214422>\
**Category:** Elasticsearch\
**Created:** [January 9, 2020, 11:27am UTC](https://discuss.elastic.co/t/failed-to-load-plugin-class-elasticsearch-authenticate-authenticateplugin/214422 "2020-01-09T11:27:42Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![kumar\_prasad](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kumar_prasad/32/60548_2.png) [@kumar\_prasad](https://discuss.elastic.co/u/kumar_prasad)\
**Post date:** [January 9, 2020, 11:27am UTC](https://discuss.elastic.co/t/failed-to-load-plugin-class-elasticsearch-authenticate-authenticateplugin/214422/1 "2020-01-09T11:27:42Z")

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elasticsearch fails to start, i see the below error  
Caused by: java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to java.util.ArrayList  
at com..elasticsearch.authenticate.accesscontrol.utils.ConfigReader.buildRolesCache(ConfigReader.java:78) ~[?:?]  
at com..elasticsearch.authenticate.accesscontrol.AccessControlCache.(AccessControlCache.java:76) ~[?:?]  
at com..elasticsearch.authenticate.AuthenticatePlugin.(AuthenticatePlugin.java:86) ~[?:?]  
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?]  
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:?]  
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?]  
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0\_221]  
at org.elasticsearch.plugins.PluginsService.loadPlugin(PluginsService.java:556) ~[elasticsearch-6.2.2.jar:6.2.2]  
at org.elasticsearch.plugins.PluginsService.loadBundle(PluginsService.java:505) ~[elasticsearch-6.2.2.jar:6.2.2]  
at org.elasticsearch.plugins.PluginsService.loadBundles(PluginsService.java:422) ~[elasticsearch-6.2.2.jar:6.2.2]  
at org.elasticsearch.plugins.PluginsService.(PluginsService.java:146) ~[elasticsearch-6.2.2.jar:6.2.2]  
at org.elasticsearch.node.Node.(Node.java:303) ~[elasticsearch-6.2.2.jar:6.2.2]  
at org.elasticsearch.node.Node.(Node.java:246) ~[elasticsearch-6.2.2.jar:6.2.2]  
at org.elasticsearch.bootstrap.Bootstrap$5.(Bootstrap.java:213) ~[elasticsearch-6.2.2.jar:6.2.2]  
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:213) ~[elasticsearch-6.2.2.jar:6.2.2]  
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:323) ~[elasticsearch-6.2.2.jar:6.2.2]  
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) ~[elasticsearch-6.2.2.jar:6.2.2]

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<div class="post-metadata">

**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\
**Post date:** [January 9, 2020, 12:06pm UTC](https://discuss.elastic.co/t/failed-to-load-plugin-class-elasticsearch-authenticate-authenticateplugin/214422/2 "2020-01-09T12:06:06Z")

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`elasticsearch.authenticate.AuthenticatePlugin` is not part of Elasticsearch so I'm guessing it's a third-party plugin which is not compatible with this version of Elasticsearch. You'll need to contact the supplier of that plugin for help.

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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:** [February 6, 2020, 12:06pm UTC](https://discuss.elastic.co/t/failed-to-load-plugin-class-elasticsearch-authenticate-authenticateplugin/214422/3 "2020-02-06T12:06:10Z")

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