Spring Boot 3 Project: How to properly deploy external configuration files to Tomcat?

Spring Boot 3 Project: Deploy external configuration files in Tomcat

In Spring Boot 3 application development, separating configuration files (such as application.properties) from project code to adapt to configuration needs of different environments is a best practice. This article will explain in detail how to exclude the application.properties file in the development environment and deploy it correctly to the Tomcat server.

Many developers place application.properties in the config folder at the root of the project during the development stage, successfully avoiding it being packaged into the WAR file. However, when deployed to Tomcat, the location and loading of configuration files became new challenges.

The solution is simple: Tomcat will decompress the WAR package to the webapps directory when deploying it. So, just copy the application.properties file to the unzipped WAR package directory. For example, there is a folder named your-app-name (this is your application name) in Tomcat's webapps directory, and copy application.properties into this folder. The Spring Boot application will automatically load the configuration file from this directory when it starts.

In this way, the separation of application.properties and WAR packages can be achieved, and external configuration files can be used normally after Tomcat is deployed.

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