Error processing condition on org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration.propertySourcesPlaceholderConfigurer
可能的错误:
(1)启动类的位置放错;
(2)依赖冲突
(3)PropertyPlaceholderAutoConfig说明属性配置文件出错;
(4)最后发现时忘记加
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>