项目启动报错：Could not resolve placeholder 'spring.datasource.url' in value "${spring.datasource.url}"
项目在配置更改后要对maven进行clean，install的操作，清除以重新编译项目
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IDEA报错： Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'spring.datasource.url' in value "${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 启动错误：Could not resolve placeholder
spring boot 启动错误：Could not resolve placeholder
新建springboot项目启动出错 Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
springboot启动报错 Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
springboot启动失败，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