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https://issues.apache.org/jira/browse/SOLR-13496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16856968#comment-16856968
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Christine Poerschke commented on SOLR-13496:
--------------------------------------------
{quote}... Failed junit tests solr.SolrInfoBeanTest ...
{quote}
I think that's unrelated to the change proposed here. SOLR-13518 just opened to
improve the debuggability of that test.
> NullPointerException in JSONWriter.writeSolrDocument
> ----------------------------------------------------
>
> Key: SOLR-13496
> URL: https://issues.apache.org/jira/browse/SOLR-13496
> Project: Solr
> Issue Type: Bug
> Reporter: Christine Poerschke
> Assignee: Christine Poerschke
> Priority: Minor
> Attachments: SOLR-13496.patch, SOLR-13496.patch
>
>
> For non-grouped searches
> [QueryComponent.regularFinishStage|https://github.com/apache/lucene-solr/blob/releases/lucene-solr/8.1.1/solr/core/src/java/org/apache/solr/handler/component/QueryComponent.java#L647-L655]
> already considers the possibility of null {{SolrDocument}} values due to an
> index change.
> For grouped searches
> [GroupedEndResultTransformer.transform|https://github.com/apache/lucene-solr/blob/releases/lucene-solr/8.1.1/solr/core/src/java/org/apache/solr/search/grouping/endresulttransformer/GroupedEndResultTransformer.java#L94-L114]
> potentially adds a null element to a {{SolrDocumentList}}.
> The
> [TextResponseWriter.writeSolrDocumentList|https://github.com/apache/lucene-solr/blob/releases/lucene-solr/8.1.1/solr/core/src/java/org/apache/solr/response/TextResponseWriter.java#L170]
> method passes any null {{SolrDocument}} through to the
> [JSONWriter.writeSolrDocument|https://github.com/apache/lucene-solr/blob/releases/lucene-solr/8.1.1/solr/core/src/java/org/apache/solr/response/JSONWriter.java#L87]
> method leading to a {{NullPointerException}} at line 87.
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