There are classes in the jar package, but import throws it wrong

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has customized a jar package. After uploading it to the private server, the class can be found through ctrl+n, but the following error is thrown when import:

Jar maven java

Nov.02,2021

idea lib

ctrl+F9 ,

jarspringbootBOOT-INF:https://blog.csdn.net/liunian...
plugin:

lib:

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