springboot啓動忽然報錯Could not resolve placeholder 'spring.datasource.driver-class-name'

以前好好的項目,今天啓動忽然報錯Could not resolve placeholder 'spring.datasource.driver-class-name'java 按照網友的方法,添加了spring @PropertySource(value = "classpath:application.properties", ignoreResourceNotFound = true) ,結果
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