How can we run same spring boot application on multiple port on the same machine?

I am assuming that you know about spring boot!.  

Why do we need to run spring app on multiple ports?

• Load Balancing Testing
• Distributed Computing Testing
• Parallel developments environment on same machine by different users(Mostly used in small team)
• Isolation and Versioning

How can we run it?

Using Command Line

First, you need to open a terminal at the root of your application. Once you have opened the terminal type the following. 

      mvn spring-boot:run -Dspring-boot.run.arguments=--server.port=8080
    

You can change 8080 to your desired port number.

Using Random Port

Open application.properties and add the following

      # application.properties
server.port=0
    

Setting server.port=0 will start the spring boot application on a random port. You can easily get the port number from logs.

      LiveReload server is running on port 35729
Tomcat started on port(s): 65449 (http) with context path ''
    

As you can see the port number 65449 has been printed on the terminal. Which can be used further to make HTTP requests.