ConcurrentModificationException

[Andrew H. <aa...@vo...>]

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.

- a.