Hi,
are you loading a lot of Classes? I've seen this error "PermGem" when having a huge classpath. 
As far as I know GC is not cleaning this part of Memory.

You can tweak the size like this: -XX:PermSize=64M -XX:MaxPermSize=128M

Not sure if this helps in anyway.
Regards Lars


On Sat, Apr 3, 2010 at 10:31 AM, Michael McCandless (JIRA) <jira@apache.org> wrote:

   [ https://issues.apache.org/jira/browse/LUCENE-2361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853110#action_12853110 ]

Michael McCandless commented on LUCENE-2361:
--------------------------------------------

Can you share some details on how you're using Lucene?  What's IndexWriters ramBufferSizeMB?  How much heap are you giving the JVM?  Are you calling commit (or closing/opening a new IndexWriter) frequently or rarely?

Can you enable IndexWriter's infoStream and post the output?

> OutOfMemoryException while Indexing
> -----------------------------------
>
>                 Key: LUCENE-2361
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2361
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 2.9.1
>         Environment: Windows
>            Reporter: Shivender Devarakonda
>
> Hi,
> We use lucene 2.9.1 version.
> We see the following OutOfMemory error in our environment, I think This is happening at a significant high load. Have you observed this anytime? Please let me know your thoughts on this.
> org.apache.lucene.index.MergePolicy$MergeException: java.lang.OutOfMemoryError: PermGen space
>       at org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:351)
>       at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:315)
> Caused by: java.lang.OutOfMemoryError: PermGen space
>       at java.lang.String.$$YJP$$intern(Native Method)
>       at java.lang.String.intern(Unknown Source)
>       at org.apache.lucene.util.SimpleStringInterner.intern(SimpleStringInterner.java:74)
>       at org.apache.lucene.util.StringHelper.intern(StringHelper.java:36)
>       at org.apache.lucene.index.FieldInfos.read(FieldInfos.java:356)
>       at org.apache.lucene.index.FieldInfos.<init>(FieldInfos.java:71)
>       at org.apache.lucene.index.SegmentReader$CoreReaders.<init>(SegmentReader.java:116)
>       at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:638)
>       at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:608)
>       at org.apache.lucene.index.IndexWriter$ReaderPool.get(IndexWriter.java:686)
>       at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4979)
>       at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4614)
>       at org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:235)
>       at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:291)

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