# While Starting Elasticsearch 6.3 ,got exception- java.lang.IllegalArgumentException: Invalid Configuration class specified Likely root cause: java.lang.NoSuchMethodError: org.apache.logging.log4j.core.config.AbstractConfiguration **URL:** \ **Category:** Elasticsearch\ **Created:** [November 1, 2018, 11:44am UTC](https://discuss.elastic.co/t/while-starting-elasticsearch-6-3-got-exception-java-lang-illegalargumentexception-invalid-configuration-class-specified-likely-root-cause-java-lang-nosuchmethoderror-org-apache-logging-log4j-core-config-abstractconfiguration/155003 "2018-11-01T11:44:10Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![dashparthapratim](https://avatars.discourse-cdn.com/v4/letter/d/ce7236/32.png) [@dashparthapratim](https://discuss.elastic.co/u/dashparthapratim)\ **Post date:** [November 1, 2018, 11:44am UTC](https://discuss.elastic.co/t/while-starting-elasticsearch-6-3-got-exception-java-lang-illegalargumentexception-invalid-configuration-class-specified-likely-root-cause-java-lang-nosuchmethoderror-org-apache-logging-log4j-core-config-abstractconfiguration/155003/1 "2018-11-01T11:44:10Z")
Hi Everyone, please help to resolve the below issue . while starting the Elasticsearch 6.3 in , i have encountered the below exception Exception in thread "main" java.lang.IllegalArgumentException: Invalid Configuration class specified Likely root cause: java.lang.NoSuchMethodError: org.apache.logging.log4j.core.config.AbstractConfiguration.(Lorg/apache/logging/log4j/core/LoggerContext;Lorg/apache/logging/log4j/core/config/ConfigurationSource;)V at org.apache.logging.log4j.core.config.builder.impl.BuiltConfiguration.(BuiltConfiguration.java:58) 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) at org.apache.logging.log4j.core.config.builder.impl.DefaultConfigurationBuilder.build(DefaultConfigurationBuilder.java:172) at org.apache.logging.log4j.core.config.builder.impl.DefaultConfigurationBuilder.build(DefaultConfigurationBuilder.java:161) at org.apache.logging.log4j.core.config.builder.impl.DefaultConfigurationBuilder.build(DefaultConfigurationBuilder.java:57) at org.elasticsearch.common.logging.LogConfigurator.configureStatusLogger(LogConfigurator.java:171) at org.elasticsearch.common.logging.LogConfigurator.configure(LogConfigurator.java:140) at org.elasticsearch.common.logging.LogConfigurator.configure(LogConfigurator.java:119) at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:294) at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:136) at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:127) at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) at org.elasticsearch.cli.Command.main(Command.java:90) at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:93) at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:86) would appreciate your suggestions and inputs to resolve this issue. regards Partha ---
**Author:** ![dashparthapratim](https://avatars.discourse-cdn.com/v4/letter/d/ce7236/32.png) [@dashparthapratim](https://discuss.elastic.co/u/dashparthapratim)\ **Post date:** [November 3, 2018, 11:54am UTC](https://discuss.elastic.co/t/while-starting-elasticsearch-6-3-got-exception-java-lang-illegalargumentexception-invalid-configuration-class-specified-likely-root-cause-java-lang-nosuchmethoderror-org-apache-logging-log4j-core-config-abstractconfiguration/155003/2 "2018-11-03T11:54:54Z")
Dear @Christian_Dahlqvist , Kindly provide your suggestion to resolve the issue ---
**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\ **Post date:** [November 3, 2018, 11:58am UTC](https://discuss.elastic.co/t/while-starting-elasticsearch-6-3-got-exception-java-lang-illegalargumentexception-invalid-configuration-class-specified-likely-root-cause-java-lang-nosuchmethoderror-org-apache-logging-log4j-core-config-abstractconfiguration/155003/3 "2018-11-03T11:58:18Z")
This forum is manned by volunteers, so please do not ping people not already involved in the thread. Also please be patient. If you have not received any answer with a few working days it it usually fine to bump the thread to get some more attention. I do not know what this exception means, so you will need to wait for someone more knowledgeable in that are to have a look. The more detail and context you provide, the better the chance of getting a good response. Just showing an exception does not necessarily give anyone a lot to go on. ---
**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:** [November 3, 2018, 12:24pm UTC](https://discuss.elastic.co/t/while-starting-elasticsearch-6-3-got-exception-java-lang-illegalargumentexception-invalid-configuration-class-specified-likely-root-cause-java-lang-nosuchmethoderror-org-apache-logging-log4j-core-config-abstractconfiguration/155003/4 "2018-11-03T12:24:41Z")
As @Christian_Dahlqvist said, please provide all details about what you did. May be you did some manual steps and removed/moved some files, or upgraded, or... Hard to help here ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [December 1, 2018, 12:25pm UTC](https://discuss.elastic.co/t/while-starting-elasticsearch-6-3-got-exception-java-lang-illegalargumentexception-invalid-configuration-class-specified-likely-root-cause-java-lang-nosuchmethoderror-org-apache-logging-log4j-core-config-abstractconfiguration/155003/5 "2018-12-01T12:25:00Z")
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