I doubt it. Needing to zero ultra large chunks of memory often enough that you care about performance to this extent is a very niche scenario. If I had to guess, Java probably just zeroes the memory upon garbage collecting it or before handing it back out; fresh pages from the OS are already zeroed.

But anything is possible. Maybe some big customer used this pattern and now Java detects it and does something fancy like what I suggested. But really, this is an unusual scenario for an application.