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https://issues.apache.org/jira/browse/SOLR-7798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373889#comment-16373889
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Michael Gibney commented on SOLR-7798:
--------------------------------------
I was able to reproduce an NPE with the above command; but the test only threw
this NPE intermittently, and I was able to reproduce it on master
(364b680afaf9) as well. I've included the stack trace to make sure we're
talking about the same issue.
{code:java}
[junit4] 2> 2778 ERROR (searcherExecutor-7-thread-1) [ ] o.a.s.s.LRUCache Error
during auto-warming of
key:org.apache.solr.search.QueryResultKey@7ce6ad2e:java.lang.RuntimeException:
java.lang.NullPointerException
[junit4] 2> at
org.apache.solr.search.CollapsingQParserPlugin$CollapsingPostFilter.getFilterCollector(CollapsingQParserPlugin.java:378)
[junit4] 2> at
org.apache.solr.search.SolrIndexSearcher.getProcessedFilter(SolrIndexSearcher.java:1084)
[junit4] 2> at
org.apache.solr.search.SolrIndexSearcher.getDocListNC(SolrIndexSearcher.java:1540)
[junit4] 2> at
org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1416)
[junit4] 2> at
org.apache.solr.search.SolrIndexSearcher.access$000(SolrIndexSearcher.java:90)
[junit4] 2> at
org.apache.solr.search.SolrIndexSearcher$3.regenerateItem(SolrIndexSearcher.java:575)
[junit4] 2> at org.apache.solr.search.LRUCache.warm(LRUCache.java:297)
[junit4] 2> at
org.apache.solr.search.SolrIndexSearcher.warm(SolrIndexSearcher.java:2146)
[junit4] 2> at
org.apache.solr.core.SolrCore.lambda$getSearcher$16(SolrCore.java:2258)
[junit4] 2> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[junit4] 2> at
org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:188)
[junit4] 2> at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
[junit4] 2> at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[junit4] 2> at java.lang.Thread.run(Thread.java:745)
[junit4] 2> Caused by: java.lang.NullPointerException
[junit4] 2> at
org.apache.solr.search.CollapsingQParserPlugin$OrdScoreCollector.<init>(CollapsingQParserPlugin.java:514)
[junit4] 2> at
org.apache.solr.search.CollapsingQParserPlugin$CollectorFactory.getCollector(CollapsingQParserPlugin.java:1331)
[junit4] 2> at
org.apache.solr.search.CollapsingQParserPlugin$CollapsingPostFilter.getFilterCollector(CollapsingQParserPlugin.java:367)
[junit4] 2> ... 13 more
{code}
> Improve robustness of ExpandComponent
> -------------------------------------
>
> Key: SOLR-7798
> URL: https://issues.apache.org/jira/browse/SOLR-7798
> Project: Solr
> Issue Type: Improvement
> Components: SearchComponents - other
> Reporter: Jörg Rathlev
> Assignee: Joel Bernstein
> Priority: Minor
> Attachments: expand-component.patch, expand-npe.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The {{ExpandComponent}} causes a {{NullPointerException}} if accidentally
> used without prior collapsing of results.
> If there are multiple documents in the result which have the same term value
> in the expand field, the size of the {{ordBytes}}/{{groupSet}} differs from
> the {{count}} value, and the {{getGroupQuery}} method creates an incompletely
> filled {{bytesRef}} array, which later causes a {{NullPointerException}} when
> trying to sort the terms.
> The attached patch extends the test to demonstrate the error, and modifies
> the {{getGroupQuery}} methods to create the array based on the size of the
> input maps.
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