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https://issues.apache.org/jira/browse/HDFS-12527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16177140#comment-16177140
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Elek, Marton commented on HDFS-12527:
-------------------------------------
The problem is that the httpclient and httpcore versions are incompatible.
We have two version definition in hadoop-project/pom.xml:
{code}
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.2</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.4.4</version>
</dependency>
{code}
The problem is that the second one is a dependency of the first one. We should
define exactly the same version in the second one which is used by the first
one.
The problem was that both the versions are bumped (HADOOP-14654 and
HADOOP-14655) but HADOOP-14655 is reverted. Now we use a different httpcore
version and not the one which is used by httpclient 4.5.2 by default. So the
two jiras should be applyed together or reverted together.
> javadoc: error - class file for org.apache.http.annotation.ThreadSafe not
> found
> -------------------------------------------------------------------------------
>
> Key: HDFS-12527
> URL: https://issues.apache.org/jira/browse/HDFS-12527
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: documentation
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Mukul Kumar Singh
>
> {code}
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-javadoc-plugin:2.10.4:jar (module-javadocs) on
> project hadoop-hdfs-client: MavenReportException: Error while generating
> Javadoc:
> [ERROR] Exit code: 1 -
> /Users/szetszwo/hadoop/t2/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/util/StripedBlockUtil.java:694:
> warning - Tag @link: reference not found: StripingCell
> [ERROR] javadoc: error - class file for org.apache.http.annotation.ThreadSafe
> not found
> [ERROR]
> [ERROR] Command line was:
> /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/../bin/javadoc
> -J-Xmx768m @options @packages
> [ERROR]
> [ERROR] Refer to the generated Javadoc files in
> '/Users/szetszwo/hadoop/t2/hadoop-hdfs-project/hadoop-hdfs-client/target/api'
> dir.
> {code}
> To reproduce the error above, run
> {code}
> mvn package -Pdist -DskipTests -DskipDocs -Dtar
> {code}
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