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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