Reference: https://blog.csdn.net/u012454773/article/details/49837153
The solution is:
xx-web project right -build Path
** changed from (None) enough
The very beginning editors do not know how to become (None), casually enter and save. Then again, edit, delete just saved, that is (None) a.
As before ** Why not load src / main files in the resources /, I do not know.
As well as how direct input (None), there is to know, tell me.