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https://issues.apache.org/jira/browse/HADOOP-19970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18107247#comment-18107247
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ASF GitHub Bot commented on HADOOP-19970:
-----------------------------------------
pan3793 commented on code in PR #8699:
URL: https://github.com/apache/hadoop/pull/8699#discussion_r3841144066
##########
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/pom.xml:
##########
@@ -104,6 +104,11 @@
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
+ <!
> Resolve a single Jetty release and servlet API on every module classpath
> ------------------------------------------------------------------------
>
> Key: HADOOP-19970
> URL: https://issues.apache.org/jira/browse/HADOOP-19970
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: build, common, test
> Reporter: Jose Luis López
> Priority: Major
> Labels: pull-request-available
>
> Several modules resolve more than one Jetty release, and more than one servlet
> API, on a single classpath. Both combinations compile and then fail at run
> time,
> on whichever code path reaches the wrong jar.
> Intended result:
> * Every module resolves one Jetty release. Three are in play today: 9.4.44
> and
> 9.4.55 reach some classpaths beside the managed 9.4.58.
> * Every module resolves one servlet API. javax.servlet:javax.servlet-api and
> jakarta.servlet:jakarta.servlet-api both publish the javax.servlet
> packages,
> and 73 modules carry both, so which one a module compiles and runs against
> is
> decided by the order of the jars rather than by anything in a pom.
> * Every module that uses Jetty in its main sources declares it. Four do not,
> and compile only because some other dependency happens to supply it.
> * The unused JSP API is gone. It reaches around eighty-five classpaths
> through
> hadoop-common, and nothing in the tree uses JSP.
> One module keeps two servlet APIs:
> hadoop-yarn-server-timelineservice-hbase-tests,
> where the second arrives with HBase's own test stack.
> None of this depends on a Jetty version change.
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