The Jenkins fork essentially made this a non-event. Here at work we have been using Hudson on Ubuntu. After an apt-get upgrade, Hudson is now Jenkins on our system. The only pain point was the change from
Oracle needs to learn that in the Java world, communities and personalities matter more than corporate branding. Most don't know Hudson as the CI project from Sun, they know it as the easy to use CI project created by Kohsuke Kawaguchi while working at Sun. Java itself was created by this guy named James Gosling. Guess what? Both left Sun/Oracle after Oracle took the reins. The battle over Hudson was about brand. Oracle was loosing the battle because they were loosing the people. That is where much of the brand equity lies.