How Do I Change the Port for My Spring Boot Application?

Configuring the Port for a Spring Boot Application

Spring Boot applications listen on the default port 8080, but there may be instances where you need to configure a different port. This article explores how to modify the port setting for your Spring Boot application.

Configuring the Port

To configure the port, you can set the server.port property. There are multiple ways to do this:

• Command-line Option: Use the -Dserver.port=8090 option when starting the application.
• application.properties: Create a application.properties file in /src/main/resources/ and set server.port=8090:

server.port=8090

• application.yml: Create a application.yml file in /src/main/resources/ and set server.port=8090:

server:
  port: 8090

Using a Random Port

If you want the application to listen on a random port, use server.port=0:

server.port=0

Additional Notes

• The port can be any valid TCP/IP port that is not already in use.
• Restart the application after making changes to the port configuration.
• If you're using a container environment like Docker or Kubernetes, the port configuration may need to be specified in the container configuration.

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