Oracle owns the trademark name 'Hudson' and so they'd be able to exert a degree of control over the community that they weren't okay with. This vote is the result of a proposal to rename to 'Jenkins,' so they could get out from under the thumb of Oracle.
And IIRC Oracle had been actively attempting to exert this degree of control, to the point of interfering in infrastructure changes that project contributors wanted to make.
Not to mention apparently being complete dicks to Kohsuke Kawaguchi; who not only founded the project, was the primary contributor while at Sun, and remains the primary contributor since leaving; but also has a rep for being a very nice person. Apparently Oracle / some oracle VP Ted were big enough assholes that KK declined to work with them in any capacity in the future [1].
So yeah, Oracle continues making friends with open source folks.
Oracle has a long history of making friends with Open Source...
This along with the whole OpenSolaris, and various other projects just makes me sad. Yes, they aren't viable business strategies (especially the amount of people Sun employed just to work on various random Open Source projects), but there is something to be said for good will.
All of this is also leaving a sour taste in the mouths of people who have budgets and make decisions, yes many people will continue to purchase stuff from Oracle but ultimately I have a feeling this will come back to haunt them. I know quite a few places that ran exclusively Sun for their servers are now looking at whitebox machines running Linux and BSD.
