check the post here its only supposed to work on a few of the n series devices but I got it working on my E61i as well even though the screen size was not perfect..
I tested on the n800 (it is a n series device after all even though linux not symbian) but it did not work.. did not recoginze the .jar file..
anywho maybe someone can get it to work or is it impossible???
cool though huh?

no java on n800.