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https://issues.apache.org/jira/browse/LUCENE-4405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457647#comment-13457647
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Uwe Schindler commented on LUCENE-4405:
---------------------------------------
Hi Radhakrishna,
the reason for this error is generally one of the following:
- You try to create a new index in a non-empty directory. If one of the files
looks like a index file name it is taken into account. Use an empty directory
for new indexes.
- You try to open an existing index, where non-lucene files are placed in it.
The above filename looks like a cloned file (e.g. by pressing Ctrl-C, Ctrl-V in
your file manager) causing this Exception. Clean up your index directory by
removing the file that contains the above pattern from the Exception message -
or recreate the index. File names are part of the Lucene index structure, so
foreign names violate the "file format" (in our case it is more a directory
format).
I would say this is wont fix for Lucene 3.x, but in Lucene trunk/4.x we should
revisit this code and maybe rethrow the NumberFormatException as
CorruptIndexException with the full file name and explanation (the above
message only shows part of the file).
> java.lang.NumberFormatException: For input string: "4g3 (1)"
> ------------------------------------------------------------
>
> Key: LUCENE-4405
> URL: https://issues.apache.org/jira/browse/LUCENE-4405
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Affects Versions: 3.5
> Environment: Windows 7 64 bit JDK
> Reporter: Radhakrishna Bhat
>
> When trying to instantiate IndexWriter, I get this exception. I have no other
> clues on why this might happen.
> Caused by: java.lang.NumberFormatException: For input string: "4g3 (1)"
> at
> java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
> at java.lang.Long.parseLong(Long.java:419)
> at
> org.apache.lucene.index.SegmentInfos.generationFromSegmentsFileName(SegmentInfos.java:214)
> at
> org.apache.lucene.index.SegmentInfos.getCurrentSegmentGeneration(SegmentInfos.java:149)
> at
> org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:626)
> at
> org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:575)
> at org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:346)
> at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:1115)
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