Has anyone else noticed any issues with Java utilization on ZfS

Ever since we applied the Java update for the DST change, we've
noticed that all our servers, at various times, can seem to have high
utilization in the zenloader, or zws packages.

We used to think it was a ZfS issue, as that's where we saw it, but
we're also seeing it in our APC software occasionally too, so I am
beginning to think it's a more general Java issue.

Has anyone else seen this? Is there a solution? A more appropriate
group to post in?