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https://issues.apache.org/jira/browse/LUCENE-844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12483305
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Jean-Philippe Robichaud commented on LUCENE-844:
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Oh, that's great. Will it be released soon against the lucene_2_1 branch ?
> org.apache.lucene.index.SegmentInfos.FindSegmentsFile.run() throwing
> NullPointerException
> -----------------------------------------------------------------------------------------
>
> Key: LUCENE-844
> URL: https://issues.apache.org/jira/browse/LUCENE-844
> Project: Lucene - Java
> Issue Type: Bug
> Components: Store
> Affects Versions: 2.1
> Reporter: Jean-Philippe Robichaud
>
> When writing a WeakReference based cache for storing IndexReader objects, I
> was hit by a NullPointerException thrown from nowhere
> The actual stacktrace I got is:
> java.lang.NullPointerException
> at
> org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:482)
> at org.apache.lucene.index.IndexReader.open(IndexReader.java:147)
> at org.apache.lucene.index.IndexReader.open(IndexReader.java:142)
> <...>
> The culprit code is in org.apache.lucene.index.SegmentInfos.FindSegmentsFile
> :
> [line 471]
> if (0 == method) {
> if (directory != null) {
> files = directory.list();
> } else {
> files = fileDirectory.list();
> }
> gen = getCurrentSegmentGeneration(files);
> if (gen == -1) {
> String s = "";
> for(int i=0;i<files.length;i++) { << EXCEPTION THROWN FROM HERE
> [line 482]
> s += " " + files[i];
> }
> throw new FileNotFoundException("no segments* file found: files:"
> + s);
> }
> }
> A check on the "files" object is required as the fileDirectory.list() can
> return null.
> In my case, the problem came from the fact that I had no more FileDescriptor
> available (bug somewhere else in my code) but the NPE was the only info I
> got...
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