Is it possible to run a Spring Boot project without configuring the application.properties file?

Yes, a Spring Boot project can be run without explicitly configuring the application.properties file. By default, Spring Boot uses built-in settings and default values for many parameters, allowing the application to start and operate without additional configuration.

However, if you need to change the application's behavior, such as configuring the server port, database connection, or other parameters, the application.properties or application.yml file is used to override these settings.

Thus, the configuration file is not mandatory for running a basic Spring Boot application but is necessary for customizing its behavior.