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From "Jesse Glick (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-3567) NPE from SegmentTermDocs.<init> from SegmentReader.termDocs
Date Mon, 07 Nov 2011 17:52:51 GMT
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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