Java games are prety hard to find on the net.That phone or yours is not an smartphone right?
I have about 100 games for my phone on my PC(there for MS Smartphone NOT Java).But only the good ones on my phone.Like Woflenstein 3D,Worms world party,SkyForce,Doom 3D,gnuboy(GameBoy emulator)...
Try your mobile operator,they probobly sell them.Or find an WAP website that has them for free(But you still pay for the downloading)
Do you have an USB cable for or phone(Or any way of sending files to your phone)? Then you can try P2P.