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https://issues.apache.org/jira/browse/SOLR-9059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15269104#comment-15269104
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ASF subversion and git services commented on SOLR-9059:
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Commit fc6c24a9d457da858cc033b4adc6e86ecd660870 in lucene-solr's branch 
refs/heads/master from jbernste
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=fc6c24a ]

SOLR-9059: NPE in SolrClientCache following collection reload


> NPE in SolrClientCache following collection reload
> --------------------------------------------------
>
>                 Key: SOLR-9059
>                 URL: https://issues.apache.org/jira/browse/SOLR-9059
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Joel Bernstein
>            Assignee: Joel Bernstein
>             Fix For: 6.1
>
>         Attachments: SOLR-9059.patch, SOLR-9059.patch
>
>
> Currently the StreamHandler opens the client cache only once when the 
> StreamHandler is initialized. During a collection reload the client cache is 
> closed by the closeHook, but not re-opened. This causes null pointers as the 
> CloudSolrClient sets the zkStateReader = null when it's closed.
> A simple fix for this is to have the SolrClientCache clear it's internal map 
> of clients after closing. The next time the cache is accessed it will then 
> create new clients.



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