Java needed only for some parts of it.
Part of Sun's marketing strategy: there has to be Java though just a bit in every supported product, even in open source ones.
Anyway, I use OpenOffice on my ArchLinux without installed java/openjdk/etc
Of course you can, but those parts you mentioned won't work.
This article should be posted in a larger community rather than just a blog. That way, people would know us more.