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** WARNING ** : Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package.
Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package.

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因為application.java 文件不能直接放在main/java文件夾下，必須要建一個包把他放進去。

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見：https://blog.csdn.net/qq_15071263/article/details/78459087