Only thing worked with my Sting at that age was to turn my back and totally ignore him. Tucked my hands up under my arms also so he couldn't grab at them. I asked other people to do the same. It took persistence but once he realized that he was only going to get attention when he had all four paws on the ground, he stopped jumping up.
Sting Chance von Gaard AKC GSD 2/8/2006