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https://issues.apache.org/jira/browse/LUCENE-7576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15716189#comment-15716189
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ASF subversion and git services commented on LUCENE-7576:
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Commit b6072f3ae539a5fc45a2bb9f99441dfeef4e440a in lucene-solr's branch
refs/heads/branch_6x from Mike McCandless
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=b6072f3 ]
LUCENE-7576: detect when special case automaton is passed to Terms.intersect
> RegExp automaton causes NPE on Terms.intersect
> ----------------------------------------------
>
> Key: LUCENE-7576
> URL: https://issues.apache.org/jira/browse/LUCENE-7576
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/codecs, core/index
> Affects Versions: 6.2.1
> Environment: java version "1.8.0_77" macOS 10.12.1
> Reporter: Tom Mortimer
> Assignee: Michael McCandless
> Priority: Minor
> Attachments: LUCENE-7576.patch
>
>
> Calling org.apache.lucene.index.Terms.intersect(automaton, null) causes an
> NPE:
> String index_path = <path to index>
> String term = <a valid term name>
> Directory directory = FSDirectory.open(Paths.get(index_path));
> IndexReader reader = DirectoryReader.open(directory);
> Fields fields = MultiFields.getFields(reader);
> Terms terms = fields.terms(args[1]);
> CompiledAutomaton automaton = new CompiledAutomaton(
> new RegExp("do_not_match_anything").toAutomaton());
> TermsEnum te = terms.intersect(automaton, null);
> throws:
> Exception in thread "main" java.lang.NullPointerException
> at
> org.apache.lucene.codecs.blocktree.IntersectTermsEnum.<init>(IntersectTermsEnum.java:127)
> at
> org.apache.lucene.codecs.blocktree.FieldReader.intersect(FieldReader.java:185)
> at org.apache.lucene.index.MultiTerms.intersect(MultiTerms.java:85)
> ...
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