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https://issues.apache.org/jira/browse/SOLR-11620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16244217#comment-16244217
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Rob Trickey commented on SOLR-11620:
------------------------------------
We're not trying to send documents to a non-existent collection, no. We see
small batches of this error, in a system that sends millions of updates, so
it's hard to pinpoint the cause. It maybe that the null collection is actually
a consequence of a different bug, and so this particular NullPointerException
is a red herring. Upon inspecting the method mentioned in the stack trace, I
noticed that all references to this variable are null-safe, bar this one, so
assumed that was the issue, but I may well be wrong.
> 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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