give it chance.
I have tied some with one leaf and in a month it's got 7-8 full leaves, others still have good roots and one single big leaf but haven't grown any more in a couple of months. I find with java its the root growth to watch, once its sorted its roots out and got a good base it will start throwing leaves up. then its a case of trimming and training. always cut stray sections with a leaf and just push them in to the main plant it will soon take off into a bushy plant.
they dont need lots to grow, i put a bit of liquid fert in my planted tanks each week but due to the fish in there they dont need it. mine are all low tech tanks, some dont even have artificial lights.