NPE from SegmentTermDocs.<init> from SegmentReader.termDocs
-----------------------------------------------------------
Key: LUCENE-3567
URL: https://issues.apache.org/jira/browse/LUCENE-3567
Project: Lucene - Java
Issue Type: Bug
Components: core/index
Affects Versions: 3.0.3
Environment: various OS and JRE combos:
http://statistics.netbeans.org/exceptions/detail.do?id=180686
Reporter: Jesse Glick
Occasionally NetBeans IDE users receive an NPE from Lucene 3.0.3 inside Maven
Indexer (currently 4.1.2) code:
{code}
java.lang.NullPointerException
at
org.apache.lucene.index.SegmentTermDocs.<init>(SegmentTermDocs.java:52)
at
org.apache.lucene.index.SegmentReader.termDocs(SegmentReader.java:963)
at org.apache.lucene.index.IndexReader.termDocs(IndexReader.java:813)
at
org.apache.lucene.index.SegmentReader.termDocs(SegmentReader.java:956)
at
org.apache.lucene.search.TermQuery$TermWeight.scorer(TermQuery.java:74)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:210)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:170)
at org.apache.lucene.search.Searcher.search(Searcher.java:98)
at org.apache.lucene.search.Searcher.search(Searcher.java:108)
at
org.apache.maven.index.DefaultIndexerEngine.getOldDocument(DefaultIndexerEngine.java:158)
....
{code}
Working backwards, {{parent.core.getTermsReader()}} is null, which means
{{SegmentReaders.CoreReaders.decRef}} was called, which means
{{SegmentReader.doClose}} was called, which means {{IndexReader.doClose}} was
called, which I suppose means something called {{IndexReader.decRef}}
prematurely. But plenty of things can call {{IndexReader.decRef}} and it is not
clear how to track down the root cause.
Note that {{SegmentReader.termDocs}} first calls {{ensureOpen()}}, which is
presumably supposed to ensure that {{decRef}} had not been called too many
times; perhaps this assertion did not work?
Downstream bug, for reference:
https://netbeans.org/bugzilla/show_bug.cgi?id=201057
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