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https://issues.apache.org/jira/browse/SPARK-12734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15090453#comment-15090453
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Apache Spark commented on SPARK-12734:
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User 'JoshRosen' has created a pull request for this issue:
https://github.com/apache/spark/pull/10672

> Fix Netty exclusions and use Maven Enforcer to prevent bug from being 
> reintroduced
> ----------------------------------------------------------------------------------
>
>                 Key: SPARK-12734
>                 URL: https://issues.apache.org/jira/browse/SPARK-12734
>             Project: Spark
>          Issue Type: Bug
>          Components: Build, Project Infra
>    Affects Versions: 1.5.0, 1.6.0
>            Reporter: Josh Rosen
>            Assignee: Josh Rosen
>
> Netty classes are published under artifacts with different names, so our 
> build needs to exclude the {{io.netty}} and {{org.jboss.netty}} versions of 
> the Netty artifact. However, our existing exclusions were incomplete, leading 
> to situations where duplicate Netty classes would wind up on the classpath 
> and cause compile errors (or worse).
> We should fix this and should also start using Maven Enforcer's dependency 
> banning mechanisms to prevent this problem from ever being reintroduced.



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