Spring Boot Application immediately shuts down after starting

For me what caused this was that I had this property below, in the application properties (carried over by mistake from a test application.properties file). See if any of your property files that are included have this like below, and remove it:

# disables the servlet-container initialization (for unit testing only)
spring.main.web-application-type=none

I met the same problem, I fix by these steps as below:
update file application.yml

1- remove:

main:
    web-application-type: none

2- if your change server port already, it's still error:

Identify and stop the process that's listening on port 8080 or configure this application to listen on another port.

solution: move server port config on the top of yml file

Done! it's for my case.

Add this dependency:

<dependency>          
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
</dependency>

Problem is solved - thanks for your help crazycoder. The issue was caused by an older version of tomcat. After upating the embedded tomcat of Spring to 1.5.3_RELEASE and updating mysql-jdbc-driver as well , it finally worked for me. I adjusted the pom.xml like this:

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.0.RELEASE</version>
</parent>