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https://issues.apache.org/jira/browse/HADOOP-17049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17111041#comment-17111041
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Akira Ajisaka commented on HADOOP-17049:
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bq. it was required to support JDK11
Yes, I think it's true. Since JDK 9, javax.activation.* have been removed from
JDK by default. Therefore Jackson needs to include some library that provides
javax.activation.* as dependency. We hit the same issue in Apache Hadoop and we
added javax.activation-api (HADOOP-15775).
javax.activation-api project is moved to jakarta.activation-api, so I created a
PR to remove javax.activation-api.
> javax.activation-api and jakarta.activation-api define overlapping classes
> --------------------------------------------------------------------------
>
> Key: HADOOP-17049
> URL: https://issues.apache.org/jira/browse/HADOOP-17049
> Project: Hadoop Common
> Issue Type: Bug
> Components: build
> Reporter: Akira Ajisaka
> Assignee: Akira Ajisaka
> Priority: Major
>
> There are some warnings in hadoop-client-runtime module.
> {noformat}
> [WARNING] javax.activation-api-1.2.0.jar, jakarta.activation-api-1.2.1.jar
> define 31 overlapping classes:
> [WARNING] - javax.activation.CommandInfo$Beans$1
> [WARNING] - javax.activation.ObjectDataContentHandler
> [WARNING] - javax.activation.DataContentHandlerFactory
> [WARNING] - javax.activation.DataContentHandler
> [WARNING] - javax.activation.CommandObject
> [WARNING] - javax.activation.SecuritySupport$2
> [WARNING] - javax.activation.FileTypeMap
> [WARNING] - javax.activation.CommandInfo
> [WARNING] - javax.activation.MailcapCommandMap
> [WARNING] - javax.activation.DataHandler$1
> [WARNING] - 21 more...
> {noformat}
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