# Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/logging/log4j/util/ReflectionUtil **URL:** \ **Category:** Elasticsearch\ **Created:** [October 4, 2017, 6:34am UTC](https://discuss.elastic.co/t/exception-in-thread-main-java-lang-noclassdeffounderror-org-apache-logging-log4j-util-reflectionutil/102651 "2017-10-04T06:34:42Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![kumar1993](https://avatars.discourse-cdn.com/v4/letter/k/8baadc/32.png) [@kumar1993](https://discuss.elastic.co/u/kumar1993)\ **Post date:** [October 4, 2017, 6:34am UTC](https://discuss.elastic.co/t/exception-in-thread-main-java-lang-noclassdeffounderror-org-apache-logging-log4j-util-reflectionutil/102651/1 "2017-10-04T06:34:42Z")
Hi I have followed the tutorial on the elastic search website and i am instantiating a High level rest client in java, but when i try to do this i run into the following exception: Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/logging/log4j/util/ReflectionUtil I have included log4j-api and log4j-core and related dependencies in my build.gradle file, not able to get why i am facing this error. ---
**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:** [October 4, 2017, 7:05am UTC](https://discuss.elastic.co/t/exception-in-thread-main-java-lang-noclassdeffounderror-org-apache-logging-log4j-util-reflectionutil/102651/2 "2017-10-04T07:05:32Z")
You just need to add: ```auto dependencies { compile 'org.elasticsearch.client:elasticsearch-rest-high-level-client:5.6.2' } ``` Nothing else. ---
**Author:** ![kumar1993](https://avatars.discourse-cdn.com/v4/letter/k/8baadc/32.png) [@kumar1993](https://discuss.elastic.co/u/kumar1993)\ **Post date:** [October 4, 2017, 7:44am UTC](https://discuss.elastic.co/t/exception-in-thread-main-java-lang-noclassdeffounderror-org-apache-logging-log4j-util-reflectionutil/102651/3 "2017-10-04T07:44:23Z")
I have added that already. ---
**Author:** ![kumar1993](https://avatars.discourse-cdn.com/v4/letter/k/8baadc/32.png) [@kumar1993](https://discuss.elastic.co/u/kumar1993)\ **Post date:** [October 4, 2017, 7:45am UTC](https://discuss.elastic.co/t/exception-in-thread-main-java-lang-noclassdeffounderror-org-apache-logging-log4j-util-reflectionutil/102651/4 "2017-10-04T07:45:40Z")
compile 'log4j:log4j:1.2.16' compile 'com.microsoft:sqljdbc4:4.0.2206.100' compile 'org.eclipse.jetty:jetty-server:8.1.16.v20140903' compile 'org.elasticsearch.client:transport:5.2.0' compile 'org.eclipse.persistence:eclipselink:2.5.2' compile 'com.google.code.gson:gson:2.3.1' compile 'com.opencsv:opencsv:3.8' compile group: 'com.microsoft.sqlserver', name: 'mssql-jdbc', version: '6.1.0.jre8' testCompile 'junit:junit:4.10' // compile 'com.oracle:ojdbc7:1.0' compile 'com.googlecode.json-simple:json-simple:1.1.1' compile group: 'org.apache.commons', name: 'commons-configuration2', version: '2.0' compile group: 'org.apache.httpcomponents', name: 'httpasyncclient', version: '4.1.3' compile group: 'org.apache.httpcomponents', name: 'httpcore-nio', version: '4.4.7' compile group: 'org.apache.httpcomponents', name: 'httpclient', version: '4.5.3' compile group: 'org.apache.httpcomponents', name: 'httpcore', version: '4.4.7' compile group: 'commons-codec', name: 'commons-codec', version: '1.10' compile group: 'commons-logging', name: 'commons-logging', version: '1.2' ``` //compile 'org.slf4j:log4j-over-slf4j:1.7.0' compile 'org.slf4j:slf4j-api:1.7.21' compile 'org.slf4j:slf4j-log4j12:1.7.21' compile 'com.floragunn:search-guard-5:5.4.0-12' compile 'com.floragunn:search-guard-ssl:5.4.0-12' compile group: 'org.apache.logging.log4j', name: 'log4j-core', version: '2.8.2' compile group: 'org.apache.logging.log4j', name: 'log4j-api', version: '2.8.2' // https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core compile group: 'com.fasterxml.jackson.core', name: 'jackson-core', version: '2.8.6' compile group:'org.apache.commons',name:'commons-dbcp2',version:'2.0.1' compile 'com.fasterxml.jackson.core:jackson-databind:2.8.6' // https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-to-slf4j compile group: 'org.apache.logging.log4j', name: 'log4j-to-slf4j', version: '2.7' // https://mvnrepository.com/artifact/org.codehaus.jackson/jackson-core-asl compile group: 'org.codehaus.jackson', name: 'jackson-core-asl', version: '1.9.13' compile 'org.elasticsearch.client:elasticsearch-rest-high-level-client:5.6.2' // https://mvnrepository.com/artifact/org.codehaus.jackson/jackson-mapper-asl compile group: 'org.codehaus.jackson', name: 'jackson-mapper-asl', version: '1.9.13' testCompile "org.mockito:mockito-core:1.+" compile group: 'org.apache.commons', name: 'commons-io', version: '1.3.2' testCompile group: 'org.powermock', name: 'powermock-api-mockito', version: '1.6.5' testCompile group: 'org.powermock', name: 'powermock-module-junit4', version: '1.6.5' ``` this is the contents of the dependencies section ---
**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:** [October 4, 2017, 7:57am UTC](https://discuss.elastic.co/t/exception-in-thread-main-java-lang-noclassdeffounderror-org-apache-logging-log4j-util-reflectionutil/102651/5 "2017-10-04T07:57:28Z")
I believe this ```auto compile 'log4j:log4j:1.2.16' ``` Is clashing with logger needed by the client. ---
**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:** [October 4, 2017, 7:58am UTC](https://discuss.elastic.co/t/exception-in-thread-main-java-lang-noclassdeffounderror-org-apache-logging-log4j-util-reflectionutil/102651/6 "2017-10-04T07:58:41Z")
Also this: ```auto compile 'org.elasticsearch.client:transport:5.2.0' ``` Is weird. ---
**Author:** ![kumar1993](https://avatars.discourse-cdn.com/v4/letter/k/8baadc/32.png) [@kumar1993](https://discuss.elastic.co/u/kumar1993)\ **Post date:** [October 4, 2017, 8:21am UTC](https://discuss.elastic.co/t/exception-in-thread-main-java-lang-noclassdeffounderror-org-apache-logging-log4j-util-reflectionutil/102651/7 "2017-10-04T08:21:35Z")
I removed both of them, but still no luck. ---
**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:** [October 4, 2017, 8:38am UTC](https://discuss.elastic.co/t/exception-in-thread-main-java-lang-noclassdeffounderror-org-apache-logging-log4j-util-reflectionutil/102651/8 "2017-10-04T08:38:19Z")
Yes. You have tons of dependencies here which might conflict with elasticsearch deps. I'd: - Start a sample project with only: ```auto dependencies { compile 'org.elasticsearch.client:elasticsearch-rest-high-level-client:5.6.2' } ``` - Add the only needed ones for your project, one by one - Find if any which one is clashing. For sure you need to clean your dependencies. ---
**Author:** ![cquon](https://avatars.discourse-cdn.com/v4/letter/c/cdc98d/32.png) [@cquon](https://discuss.elastic.co/u/cquon)\ **Post date:** [October 13, 2017, 7:06pm UTC](https://discuss.elastic.co/t/exception-in-thread-main-java-lang-noclassdeffounderror-org-apache-logging-log4j-util-reflectionutil/102651/9 "2017-10-13T19:06:46Z")
I have faced a similar issue. Can you try: compile group: 'org.apache.logging.log4j', name: 'log4j-core', version: '2.8.2' compile group: 'org.apache.logging.log4j', name: 'log4j-api', version: '2.8.2' Changing those versions to 2.9.1? Appeared to resolve it for me. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [November 10, 2017, 7:06pm UTC](https://discuss.elastic.co/t/exception-in-thread-main-java-lang-noclassdeffounderror-org-apache-logging-log4j-util-reflectionutil/102651/10 "2017-11-10T19:06:58Z")
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