I'm getting this exception thrown over and over with differnet file names. Not sure what's causing it but it wasn't happening before today. Using HS 3.4.0.Final with Lucene Core 3.1.0, and I haven't changed that version at all recently.

Any ideas on what might've changed that would cause this issue?

ERROR 25 Aug 2011 14:12:25,763 LogErrorHandler - Exception occurred org.apache.lucene.index.MergePolicy$MergeException: java.io.FileNotFoundException: /../../../../[index]/_19j.cfs (No such file or directory)

org.apache.lucene.index.MergePolicy$MergeException: java.io.FileNotFoundException: /../../../../[index]/_19j.cfs (No such file or directory)
at org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:517)
at org.hibernate.search.backend.impl.lucene.overrides.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:49)
at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:482)
Caused by: java.io.FileNotFoundException: /../../../../[index]/_19j.cfs (No such file or directory)
at java.io.RandomAccessFile.open(Native Method)
at java.io.RandomAccessFile.<init>(RandomAccessFile.java:212)
at org.apache.lucene.store.SimpleFSDirectory$SimpleFSIndexInput$Descriptor.<init>(SimpleFSDirectory.java:69)
at org.apache.lucene.store.SimpleFSDirectory$SimpleFSIndexInput.<init>(SimpleFSDirectory.java:90)
at org.apache.lucene.store.NIOFSDirectory$NIOFSIndexInput.<init>(NIOFSDirectory.java:91)
at org.apache.lucene.store.NIOFSDirectory.openInput(NIOFSDirectory.java:78)
at org.apache.lucene.index.CompoundFileReader.<init>(CompoundFileReader.java:66)
at org.apache.lucene.index.SegmentReader$CoreReaders.<init>(SegmentReader.java:113)
at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:578)
at org.apache.lucene.index.IndexWriter$ReaderPool.get(IndexWriter.java:684)
at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:3918)
at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3614)
at org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:388)
at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:456)

Fixed the issue.. stupid mistake actually, build script wasn't placing the WAR file I was using in the correct directory and I was uploading an old version, which the indexed classes had different names.