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https://issues.apache.org/jira/browse/SOLR-18188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18090748#comment-18090748
 ] 

Chris M. Hostetter commented on SOLR-18188:
-------------------------------------------

LIkewise, bisect identified this issue as the cause of failures in 
{{ShardSplitTest}}

(I tested {{ShardSplitTest.testSplitStaticIndexReplication}} but the logs show 
the same types of exceptions from 
{{ShardSplitTest.testSplitStaticIndexReplicationLink}} ...
{noformat}
./gradlew -p solr/core test --tests 
ShardSplitTest.testSplitStaticIndexReplication -Dtests.seed=A8D9D172225286EA 
-Dtests.nightly=true 
-Dtests.linedocsfile=/home/jenkins/jenkins-agent/workspace/Solr/Solr-NightlyTests-main/test-data/enwiki.random.lines.txt
 -Dtests.locale=ru-UA -Dtests.timezone=AET -Dtests.asserts=true 
-Dtests.file.encoding=UTF-8

ShardSplitTest > testSplitStaticIndexReplication FAILED
    java.lang.ClassCastException: class 
org.apache.solr.client.solrj.impl.CloudHttp2SolrClient cannot be cast to class 
org.apache.solr.client.solrj.jetty.CloudJettySolrClient 
(org.apache.solr.client.solrj.impl.CloudHttp2SolrClient and 
org.apache.solr.client.solrj.jetty.CloudJettySolrClient are in unnamed module 
of loader 'app')
        at 
__randomizedtesting.SeedInfo.seed([A8D9D172225286EA:E2934572B3FAA9EF]:0)
        at 
org.apache.solr.cloud.api.collections.ShardSplitTest.doSplitStaticIndexReplication(ShardSplitTest.java:159)
        at 
org.apache.solr.cloud.api.collections.ShardSplitTest.testSplitStaticIndexReplication(ShardSplitTest.java:123)
{noformat}

> solr-test-framework: Remove Apache HttpClient usages
> ----------------------------------------------------
>
>                 Key: SOLR-18188
>                 URL: https://issues.apache.org/jira/browse/SOLR-18188
>             Project: Solr
>          Issue Type: Task
>          Components: test-framework, Tests
>            Reporter: David Smiley
>            Assignee: David Smiley
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 10.1
>
>          Time Spent: 6h 50m
>  Remaining Estimate: 0h
>
> As of this writing, the last usages of Apache HttpClient are in Solr's tests. 
>  This issue aims to remove it completely.  But it's a lot of work.
> Some possible steps:
>  * Remove tests for our HttpSolrClient & friends (fundamentally based on 
> Apache HttpClient)
>  * Replace usages of HttpSolrClient.getHttpClient with 
> HttpJettySolrClient.getHttpClient
>  * Replace usages of HttpSolrClient.getBaseURL by introducing a new base 
> client that has this method.  Or access similarly from Jetty when easily 
> available.
>  * of course, stop using HttpSolrClient & friends.  Maybe class-by-class.



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