Too many files open after upgrading to 10.8

[Katherine Marsden]

I have few details yet, but have a report from a user upgrading from 
10.5 to 10.8 who is reporting occurrences of  IOException too many open 
files on both linux and windows in their test suite after the upgrade.  
The actual error is not usually in the Derby code but  it may be that 
Derby is hogging too many files causing this failure later in their code.

They can reproduce the problem in a 15 minute test.  Is there a generic 
java or operating system way to trace the opening and closing of files?  
If not, what would be the best place  to add tracing to Derby?

Thanks

Kathey