找不到类org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration]

使用依赖管理

<dependencyManagement>    <dependencies>        <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Finchley.M8</version> <type>pom</type> <scope>import</scope>        </dependency>    </dependencies></dependencyManagement>

将此插入

<project>...</project>