Tom Mortimer created LUCENE-7646:
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Summary: 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: 6.3, 6.2
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
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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