How do I install Java Games on Samsung s8300

I have a s8300 I recently bought but every time I install a game it gives me a error when I try to play the game
"Java Error"
" NO Memory Available"
I checked the free space on the phone its enough and I I just dont know what to do PLease advise me Any one with help on how to resolve this I feel like a idiot but I dont know what else to do. . . .

all you have to do is select the secret option and your game will play...do this.....open phone and press
star hash 6984125 star hash select internal then enter master key...which is star hash 9072641 star hash select storage then settings then click on update java db.....then all your games will work....happy gaming!!!