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https://issues.apache.org/jira/browse/SOLR-7401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14496570#comment-14496570
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ASF subversion and git services commented on SOLR-7401:
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Commit 1673890 from [~shaie] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1673890 ]
SOLR-7401: fix copy/paste bug
> NPE when concurrently creating and deleting collections
> -------------------------------------------------------
>
> Key: SOLR-7401
> URL: https://issues.apache.org/jira/browse/SOLR-7401
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Reporter: Shai Erera
> Assignee: Shai Erera
> Fix For: Trunk, 5.2
>
> Attachments: SOLR-7401.patch
>
>
> I've hit this when multiple tests run against the same Solr server. Some
> tests create a collection, do some stuff and then delete it, but there are
> two tests which create+delete a collection, and then assert it doesn't exist
> by searching it (expecting to hit an exception). While I think this isn't the
> best way to assert a collection doesn't exist (I intend to change this assert
> to use a LIST command), it did surface this concurrency bug.
> {noformat}
> java.lang.NullPointerException
> at java.util.ArrayList.addAll(ArrayList.java:577)
> at
> org.apache.solr.servlet.SolrDispatchFilter.getSlicesForCollections(SolrDispatchFilter.java:731)
> at
> org.apache.solr.servlet.SolrDispatchFilter.getRemotCoreUrl(SolrDispatchFilter.java:669)
> {noformat}
> The problem is that getSlicesForCollections may get a CollectionRef whose
> collection value may be {{null}}, therefore attempting to add {{null}} to the
> list. I reproduced in a test, and fixed the bug.
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