How to change Grails App server port in application.yml

This is a quick tutorial on how to set server port while running grails application. By default, grails will use the embedded tomcat server running on port 8080.

Sometimes if another process is using port 8080 then we might get a port address already in use error.

So, what we will do is to change the default port in the config. In grails 3.x version we can set up the custom port inside application.yml file.

Inside application.yml file lets add the following config setup to override the default port 8080.

server:
    port : "8090"

Now if we run the application, it will run on port 8090. 

If we want to configure the setup within the environment then we can do as below:

environments:
    development:
        server:
            port : "8090"

This will set the server port only for the development environment. Re-run the application.