What should I do if IDEA Spring-boot-devTools is invalid?

Spring-boot is used in the project. Because when modifying the front end, frequent preview styles are required, but it cannot be restarted every time, which is too slow. So I found this very helpful method!

There is so much nonsense, how to solve it? Please be patient and read below.

First of all, this must be checked in the IDEA settings

Then Shift+Ctrl+Alt+/, select Registry

After entering, find the option as shown in the picture below, check it

ok, restart the project, and then change the content in the class, IDEA will It will automatically go to make.

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