Some of you guys asked for a link where to download the quick porting of Java for N800.
I am sorry I was not able to respond quickly.
Here it is a link, but I am not sure for how long I can keep it up:

http://193.205.161.34/JavaN800

Please do remind that this is not an official port and I am not responsible for anything that these packages can do (in case they choose to) on your devices.