# Logstash 6 includes both 2.6.2 and 2.8.2 for slf4j

**URL:** <https://discuss.elastic.co/t/logstash-6-includes-both-2-6-2-and-2-8-2-for-slf4j/103615>\
**Category:** Logstash\
**Created:** [October 11, 2017, 8:35pm UTC](https://discuss.elastic.co/t/logstash-6-includes-both-2-6-2-and-2-8-2-for-slf4j/103615 "2017-10-11T20:35:11Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [October 11, 2017, 8:35pm UTC](https://discuss.elastic.co/t/logstash-6-includes-both-2-6-2-and-2-8-2-for-slf4j/103615/1 "2017-10-11T20:35:11Z")

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When I start logstash 6.0.0-rc1 after upgrading from 5.6.2 it complains that there are two bindings in the path

```
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/share/logstash/logstash-core/lib/org/apache/logging/log4j/log4j-slf4j-impl/2.6.2/log4j-slf4j-impl-2.6.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-input-kafka-8.0.2/vendor/jar-dependencies/runtime-jars/log4j-slf4j-impl-2.8.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]
```

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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:** [November 8, 2017, 8:35pm UTC](https://discuss.elastic.co/t/logstash-6-includes-both-2-6-2-and-2-8-2-for-slf4j/103615/2 "2017-11-08T20:35:49Z")

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