Terry Smith created LUCENE-6385:
-----------------------------------
Summary: NullPointerException from Highlighter.getBestFragment()
Key: LUCENE-6385
URL: https://issues.apache.org/jira/browse/LUCENE-6385
Project: Lucene - Core
Issue Type: Bug
Components: modules/highlighter
Affects Versions: 5.1
Reporter: Terry Smith
When testing against the 5.1 nightly snapshots I've come across a
NullPointerException in highlighting when nothing would be highlighted. This
does not happen with 5.0.
{noformat}
java.lang.NullPointerException
at
__randomizedtesting.SeedInfo.seed([3EDC6EB0FA552B34:9971866E394F5FD0]:0)
at
org.apache.lucene.search.highlight.WeightedSpanTermExtractor.extractWeightedSpanTerms(WeightedSpanTermExtractor.java:311)
at
org.apache.lucene.search.highlight.WeightedSpanTermExtractor.extract(WeightedSpanTermExtractor.java:151)
at
org.apache.lucene.search.highlight.WeightedSpanTermExtractor.getWeightedSpanTerms(WeightedSpanTermExtractor.java:515)
at
org.apache.lucene.search.highlight.QueryScorer.initExtractor(QueryScorer.java:219)
at
org.apache.lucene.search.highlight.QueryScorer.init(QueryScorer.java:187)
at
org.apache.lucene.search.highlight.Highlighter.getBestTextFragments(Highlighter.java:196)
at
org.apache.lucene.search.highlight.Highlighter.getBestFragments(Highlighter.java:156)
at
org.apache.lucene.search.highlight.Highlighter.getBestFragment(Highlighter.java:102)
at
org.apache.lucene.search.highlight.Highlighter.getBestFragment(Highlighter.java:80)
at
org.apache.lucene.search.highlight.MissesTest.testPhraseQuery(MissesTest.java:50)
{noformat}
I've written a small unit test and used git bisect to narrow the regression to
the following commit:
{noformat}
commit 24e4eefaefb1837d1d4fa35f7669c2b264f872ac
Author: Michael McCandless <mikemcc...@apache.org>
Date: Tue Mar 31 08:48:28 2015 +0000
LUCENE-6308: cutover Spans to DISI, reuse ConjunctionDISI, use two-phased
iteration
git-svn-id:
https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1670273
13f79535-47bb-0310-9956-ffa450edef68
{noformat}
The problem looks quite simple,
WeightedSpanTermExtractor.extractWeightedSpanTerms() needs an early return if
SpanQuery.getSpans() returns null. All other callers check against this.
Unit test and fix (against the regressed commit) attached.
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