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在官网(http://start.spring.io/)上generate project，将生成的项目导入idea中，运行之后控制台输出“Unregistering JMX-exposed beans on shutdown”，tomcat也没有运行。寻找原因，看了下pom.xml文件中tomcat依赖关系如下：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
将<scope>provided</scope>注释掉，重新运行项目便可启动嵌入的tomcat服务器：
Tomcat started on port(s): 8080 (http)
原文地址：https://blog.youkuaiyun.com/sun20100912/article/details/52013463
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Spring-boot启动失败 Unregistering JMX-exposed beans on shutdown 异常处理
Spring-boot启动失败 Unregistering JMX-exposed beans on shutdown 异常处理
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