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https://issues.apache.org/jira/browse/LUCENE-3446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13112408#comment-13112408
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Uwe Schindler commented on LUCENE-3446:
---------------------------------------
Thanks for reporting this bug. Indeed, getDocIdSet() and
DISI.getDocIdSetIterator() can return null, if no documents match.
BooleanFilter must respect this.
I will take care.
> NullPointerException in BooleanFilter
> --------------------------------------
>
> Key: LUCENE-3446
> URL: https://issues.apache.org/jira/browse/LUCENE-3446
> Project: Lucene - Java
> Issue Type: Bug
> Components: modules/other
> Affects Versions: 3.4
> Reporter: Shuji Umino
> Assignee: Uwe Schindler
> Priority: Minor
>
> BooleanFilter getDISI() method used with QueryWrapperFilter occur
> NullPointerException,
> if any QueryWrapperFilter not match terms in IndexReader.
> ---------------------------------------------------
> java.lang.NullPointerException
> at
> org.apache.lucene.util.OpenBitSetDISI.inPlaceAnd(OpenBitSetDISI.java:66)
> at
> org.apache.lucene.search.BooleanFilter.getDocIdSet(BooleanFilter.java:102)
> at
> org.apache.lucene.search.IndexSearcher.searchWithFilter(IndexSearcher.java:551)
> at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:532)
> at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:463)
> at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:433)
> at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:356)
> at test.BooleanFilterTest.main(BooleanFilterTest.java:50)
> ---------------------------------------------------
> null-check below lines.
> ---------------------------------------------------
> res = new OpenBitSetDISI(getDISI(shouldFilters, i, reader), reader.maxDoc());
> res.inPlaceOr(getDISI(shouldFilters, i, reader));
> res = new OpenBitSetDISI(getDISI(notFilters, i, reader), reader.maxDoc());
> res.inPlaceNot(getDISI(notFilters, i, reader));
> res = new OpenBitSetDISI(getDISI(mustFilters, i, reader), reader.maxDoc());
> res.inPlaceAnd(getDISI(mustFilters, i, reader));
> ---------------------------------------------------
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