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https://issues.apache.org/jira/browse/SOLR-11620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16245745#comment-16245745
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Erick Erickson commented on SOLR-11620:
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Great info Rob, thanks! I'm not quite sure what the right fix here is, but this
is great info for someone who is.
> 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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