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https://issues.apache.org/jira/browse/SOLR-11620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16244464#comment-16244464
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Tomás Fernández Löbbe commented on SOLR-11620:
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I have seen this before too. I'm not entirely sure the root cause (maybe
SOLR-9440? Although maybe I'm attributing too many things to that Jira :) ),
but the null check is also necessary for when the user requests non-existing
collections.
bq. Wrapping this loop with if(requestedCollections != null) would solve the
problem
I wouldn't just skip the null collection silently, we should throw a bad
request.
> Occasional NullPointerException in CloudSolrClient
> ---------------------------------------------------
>
> Key: SOLR-11620
> URL: https://issues.apache.org/jira/browse/SOLR-11620
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrJ
> Affects Versions: 6.6.1
> Reporter: Rob Trickey
> Priority: Minor
>
> When sending document updates to Solr, we occasionally see the following
> error:
> java.lang.NullPointerException
> at
> org.apache.solr.client.solrj.impl.CloudSolrClient.requestWithRetryOnStaleState(CloudSolrClient.java:1182)
> at
> org.apache.solr.client.solrj.impl.CloudSolrClient.request(CloudSolrClient.java:1073)
> at
> org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:160)
> at org.apache.solr.client.solrj.SolrClient.add(SolrClient.java:173)
> at org.apache.solr.client.solrj.SolrClient.add(SolrClient.java:138)
> at org.apache.solr.client.solrj.SolrClient.add(SolrClient.java:152)
> Looking at the code, there is a lack of null check on requestedCollections
> around the for loop
> for (DocCollection ext : requestedCollections)
> which causes the error. Wrapping this loop with if(requestedCollections !=
> null) would solve the problem.
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