[LUCENE-2496] NPE if you open IW with CREATE on an index with no segments file

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.1, 4.0-ALPHA
• Lucene Fields: New
• Assignee: Michael McCandless
• Reporter: Michael McCandless
• Created: 10/Jun/10 20:33
• Updated: 28/Aug/22 12:27
• Resolved: 30/Oct/10 15:32

Description

I have a simple test case that hits this NPE:

    [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)

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.