NPE if you open IW with CREATE on an index with no segments file
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Key: LUCENE-2496
URL: https://issues.apache.org/jira/browse/LUCENE-2496
Project: Lucene - Java
Issue Type: Bug
Reporter: Michael McCandless
Assignee: Michael McCandless
Priority: Minor
I have a simple test case that hits this NPE:
{noformat}
[junit] java.lang.NullPointerException
[junit] at java.io.File.<init>(File.java:305)
[junit] at
org.apache.lucene.store.NIOFSDirectory.openInput(NIOFSDirectory.java:67)
[junit] at
org.apache.lucene.store.FSDirectory.openInput(FSDirectory.java:333)
[junit] at
org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:213)
[junit] at
org.apache.lucene.index.IndexFileDeleter.<init>(IndexFileDeleter.java:218)
[junit] at
org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:1113)
[junit] at
org.apache.lucene.index.TestIndexWriter.testNoSegmentFile(TestIndexWriter.java:4975)
[junit] at
org.apache.lucene.util.LuceneTestCase.runBare(LuceneTestCase.java:277)
{noformat}
It happens if you have an aborted index, ie, there are segment files in there
(*.frq, *.tis, etc.) but no segments_N file, and then you try to open an IW
with CREATE on that index.
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