Re: ConcurrentModificationException

[Brian W. <bwe...@xb...>]

On Thu, 10 Oct 2002, Andrew Houghton wrote:

> Just going through some servlet logs and found this:
> 
> java.util.ConcurrentModificationException
> 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:750)
> 	at java.util.HashMap$KeyIterator.next(HashMap.java:786)
> 	at org.xbill.DNS.Cache$CacheCleaner.clean(Cache.java:120)
> 	at org.xbill.DNS.Cache$CacheCleaner.run(Cache.java:152)
> 
> I'm using the 1.3.0 beta; I have no context information and no idea what 
> it was I did that led to this (sorry), but I thought it might be useful 
> if I passed this info on.
> 
> For what it's worth, I've got lots of little threads doing DNS lookups 
> at various times, but this exception seems to be a lower level problem.

Thanks.  I can reproduce this by running a program which does a lot of 
queries in combination with aggressive cache cleaning, so it shouldn't be 
too hard to fix.

This would have turned up sooner had earlier versions properly started the 
cache cleaner.  Sigh.

Brian