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https://issues.apache.org/jira/browse/LUCENE-4882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13614607#comment-13614607
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crocket commented on LUCENE-4882:
---------------------------------
I have a facet "me" that doesn't have a subcategory. Does it mean I need to
modify CountingListBuilder as well as FacetsAccumulator or just use
StandardFacetsAccumulator?
> 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
> Assignee: Shai Erera
> Priority: Critical
> Fix For: 5.0, 4.3
>
> Attachments: LUCENE-4882.patch
>
>
> 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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