回复：我从欧洲签J-1 到美, 我的J-1 上说"BEARER IS NOT SUBJECT TO 212(E), TWO YE

It is better to do waiver.

Also, because you came from Europe, you may not use the Chinese-USA tax treaty. It means you need use that Europe country's tax treaty. You need ask them to make sure it. Or you will have trouble in the future.