項目啟動報錯：Could not resolve placeholder 'spring.datasource.url' in value "${spring.datasource.url}"
項目在配置更改后要對maven進行clean，install的操作，清除以重新編譯項目
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IDEA報錯： Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'spring.datasource.url' in value "${spring.datasource.url}"
Failed to auto-configure a DataSource: 'spring.datasource.url' is not specified and no embedded datasource could be auto-configured.
Failed to auto-configure a DataSource: 'spring.datasource.url' is not specified and no embedded datasource could be auto-configured.
spring boot 啟動錯誤：Could not resolve placeholder
spring boot 啟動錯誤：Could not resolve placeholder
新建springboot項目啟動出錯 Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
springboot啟動報錯 Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
springboot啟動失敗，提示Could not resolve placeholder 'spring.redis.host' in value "${spring.redis.host}"
Could not resolve placeholder 'jdbc.url' in value "${jdbc.url}"
spring boot @Value Could not resolve placeholder