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https://issues.apache.org/jira/browse/LUCENE-3567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13145665#comment-13145665
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Michael McCandless commented on LUCENE-3567:
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Hmm try to double check all places that close/decRef the reader; most likely
the IR is over-decRef'd, or...
Are there threads involved? If so, it could be one thread closes the IR while
another thread is still using it (which could explain why SR.termDocs call to
ensureOpen didn't catch that the reader was closed, ie the close happened in
the tiny window after ensureOpen and before STD.init called .getTermsReader()).
Lucene 3.5.0 will have the SearcherManager class to handle correctly sharing a
searcher across threads with reopens... probably back-porting to work on 3.0.x
wouldn't be so bad? I described it here:
http://blog.mikemccandless.com/2011/09/lucenes-searchermanager-simplifies.html
> 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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