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https://issues.apache.org/jira/browse/LUCENE-4882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13613466#comment-13613466
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Shai Erera commented on LUCENE-4882:
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bq. Does someone conspire to prevent others from counting root categories?
Hehe, no, no conspiracy. I'll look into it!
> FacetsAccumulator.java:185 throws NullPointerException if it's given an empty
> CategoryPath.
> -------------------------------------------------------------------------------------------
>
> Key: LUCENE-4882
> URL: https://issues.apache.org/jira/browse/LUCENE-4882
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/facet
> Affects Versions: 4.2
> Reporter: crocket
> Priority: Critical
>
> When I wanted to count root categories, I used to pass "new CategoryPath(new
> String[0])" to a CountFacetRequest.
> Since upgrading lucene from 4.1 to 4.2, that threw
> ArrayIndexOfOutBoundsException, so I passed CategoryPath.EMPTY to a
> CountFacetRequest instead, and this time I got NullPointerException.
> It all originates from FacetsAccumulator.java:185
> Does someone conspire to prevent others from counting root categories?
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