I worked on a patch to fix a bug in the Pisces renderer:
The bug was that a circle was rendered like a 'C' shape, that is, the right most edge of the circle wasn't rendered properly. It turned out that there was a off-by-one error.
And there are a few more bugfixes in progress:
Thanks to Jennifer Godinez.
[Note: at least the 100031 patch has been checked into OpenJDK.]