Didnt china have J-2 in korean war?
It's intresting that,informations about J-2~J-4 almostly from Chinese internet opinion leaders but no official records.Officially chinese fighter jet started from J-5.
The opinion leaders declare that J-2 is mig-15,J-3 is Mig-9 and J-4 is mig-15 BIS.
but accroding to a professor of Nanjing University of Aeronautics and Astronautics, J-5(歼五)means from nothing(五 have a same pronunciation to 无,which means nothing) to eveything.
As for Mig-15 is self.
I mean Mig-17 is just a virant of Mig-15. chinese do have mimic Mig-15(maybe in 1957?), but at last they choose an advantage virant----Mig-17,and that is J-5