Free and open Java

There are many rumors about free and open java. Yeah, i think it's a great step. If it works like a standard Sun Java it's very very good. Last time i've used it was about 1-2 month ago. Maybe it wasn't latest version on those day, i don't know, it come in with an regular Ubuntu update, but Eclipse just stop working after this :( I spent about one hour until realizes what is happened.
BTW, if it opened now i think it can make easier to fix bugs (there was too many minor bugs, where patch presents, but not fixed for a long time, in some cases more that a few years) and performance optimizations and improvements (maybe some one will make a tail recursion optimization for java, for example?)