Idea操作
1.打开配置界面,菜单栏File>Setting>Build>build Tools>Maven>Runner,或者快捷键Ctrl+Shift+S
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2.勾选Delegate IDE build/run actions to Maven
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3.File > invalidate Caches/Restart
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4.选择Invalidate and Restart
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5.如果还是报红色,请先将POM中引用的Jar包注释掉,刷新Maven后再重新引用