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Idea if a class cannot be found, it will be red

2022-07-04 01:47:00 【Abby's daily life】

background

Open the project today , When looking at the code, I find that a class is red , Ask a colleague that he has no problem . So try to refresh maven, To no avail
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reflection

The first feeling is idea The problem of , therefore 

File > invalidate Caches > invalidate and restart

idea Automatic restart , After reloading the project , Problem fix
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