Spring Boot: The Tomcat connector configured to listen on port 8080 failed to start

I meet with a similar issue when the webserver visit is busy, 

so your server socket may have TIME_WAIT state, 

in this case, 

the tomcat-embedded-server in spring boot can't bind this port because 

SO_REUSEADDR is not set to true

there is a similar issue for that- 

• Spring Boot application in eclipse, the Tomcat connector configured to listen on port XXXX failed to start

• Protocol handler start failed

• Spring Boot Issue while Running the Spring Boot APP

Solutions:-  there are multiple solutions, 

so getting to know what exactly your issue is not so easy,

here is more than one solution, 

Hit and try which one works for you.

1-

so my solution is to use Jetty in spring boot, you can change your pom.xml

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclusions> <exclusion> <groupId>org.springframework.boot</groupId>  <artifactId>spring-boot-starter-tomcat</artifactId> </exclusion> </exclusions> </dependency> <dependency>  <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jetty</artifactId> </dependency>

  if the above one not working, try from below solution

2-

goto task manager -> processes and end Java(TM) Platform SE binary

processes (this will stop tomcat) and run your spring boot application 
again.

3-

On the console, looking at the topmost right side of the dialog you 

should see a red button kinda like a buzzer. To stop the spring boot 

application properly you just ran, go ahead and hit this particular 

"red" button and your problem is solved. Hope this helps!

here is some more solution-

4-

1. Find the process ID (PID) for the port (e.g.: 8080)

   On Windows:

   netstat -ao | find "8080"

   Other Platforms other than windows :

   lsof -i:8080

2. Kill the process ID you found (e.g.: 20712)

   On Windows:

   Taskkill /PID  20712 /F

   Other Platforms other than windows :

   kill -9 20712   or kill 20712

5-

Another easy way of solving this error is right-clicking in the console and click on Terminate/Disconnect All. Afterward, run the application it should work fine.

6-

On Ubuntu, you can use "ps aux | grep java" 

to find the process and "kill -9 PID_NUMBER" to kill the process.

OR

If you're using a Spring boot application, go to application.properties and add this:

server.port = 8081

7-

 In case your app is run on https, 

make sure you put right values

under the following properties:

server.ssl.key-store-password=
server.ssl.key-alias=