Initializing Spring FrameworkServlet 'dispatcherServlet'

2019-03-12 16:06:52,920 ------ INFO [http-nio-8081-exec-1] Caller+0	
 at org.apache.juli.logging.DirectJDKLog.log(DirectJDKLog.java:179)
- Initializing Spring FrameworkServlet 'dispatcherServlet'

2019-03-12 16:06:52,920 ------ INFO [http-nio-8081-exec-1] Caller+0	 at 
org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:489)
- FrameworkServlet 'dispatcherServlet': initialization started

2019-03-12 16:06:52,953 ------ INFO [http-nio-8081-exec-1] Caller+0	 at 
org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:508)
 - FrameworkServlet 'dispatcherServlet': initialization completed in 33 ms

现象：

在使用springboot 内置的tomcat 时，有时候启动了Application 之后，使用post测试没有反应，控制台打印上面的日志。偶现，但是概率比较大。