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https://issues.apache.org/jira/browse/LUCENE-7646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15834304#comment-15834304
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Tom Mortimer edited comment on LUCENE-7646 at 1/23/17 11:37 AM:
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Mike, thanks for the comments. I didn't notice that when I posted the code like
that, it changed the regex from
{noformat}.*.*{noformat}
to
{noformat}..{noformat}
which doesn't cause a problem. I've since found the same problem with the
"non-silly" expression
{noformat}.*{noformat}
{noformat}
Exception in thread "main" java.lang.NullPointerException
at
org.apache.lucene.index.AutomatonTermsEnum.<init>(AutomatonTermsEnum.java:79)
at RegExpNPE.main(RegExpNPE.java:20)
{noformat}
was (Author: tommortimer):
Mike, thanks for the comments. I didn't notice that when I posted the code like
that, it changed the regex from
{noformat}.*.*{noformat}
to
{noformat}..{noformat}
which doesn't cause a problem. I've since found the same problem with the
"non-silly" expression
{noformat}.*{noformat}
> AutomatonTermsEnum constructor throws a NullPointerException with "silly"
> RegExp
> --------------------------------------------------------------------------------
>
> Key: LUCENE-7646
> URL: https://issues.apache.org/jira/browse/LUCENE-7646
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index, core/other
> Affects Versions: 6.2, 6.3
> Environment: MacOS
> java version "1.8.0_77"
> Java(TM) SE Runtime Environment (build 1.8.0_77-b03)
> Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode)
> Reporter: Tom Mortimer
> Priority: Minor
> Attachments: LUCENE-7646.patch
>
>
> When constructing a AutomatonTermsEnum using a CompiledAutomaton with a
> "silly" RegExp (".*.*") a NullPointerException is thrown. See code below:
> import java.nio.file.Paths;
> import org.apache.lucene.index.*;
> import org.apache.lucene.store.*;
> import org.apache.lucene.util.automaton.*;
> public class RegExpNPE {
> final static String REGEXP = ".*.*";
> // replace these as appropriate
> final static String INDEX = "../src/test/resources/index";
> final static String FIELD = "text";
> public static void main(String[] args) throws Exception {
> Directory directory = FSDirectory.open(Paths.get(INDEX));
> IndexReader reader = DirectoryReader.open(directory);
> Fields fields = MultiFields.getFields(reader);
> Terms terms = fields.terms(FIELD);
> TermsEnum termsEnum = terms.iterator();
> CompiledAutomaton automaton = new CompiledAutomaton(new
> RegExp(REGEXP).toAutomaton());
> TermsEnum termsEnum2 = new AutomatonTermsEnum(termsEnum, automaton);
> }
> }
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