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SUBSCRIBE TO THE CHANNELMastering Spring Boot Deployment on External Tomcat
Transitioning from Spring Boot's embedded server to an external Tomcat instance is a common requirement for production-grade REST APIs. While embedded servers are great for speed, external servers offer centralized management and shared resources. This guide makes the switch simple and efficient.
Step 1: Packaging as a WAR File
To deploy to an external server, you must change your build packaging. In your pom.xml, update the <packaging> tag to war. This ensures Maven creates the correct file structure for Tomcat to read.
Step 2: Configure the Servlet Initializer
Your Spring Boot application needs a starting point that an external container can recognize. You’ll need to extend the SpringBootServletInitializer class in your main entry point. This small code adjustment bridges the gap between your app and the Tomcat server.
Step 3: Excluding Embedded Tomcat
To avoid version conflicts, mark the spring-boot-starter-tomcat dependency as provided in your dependencies. This tells the build process not to include the server inside your WAR file, as the external Tomcat will already provide it.
Step 4: The Deployment Process
Once your WAR file is generated, copy it into the webapps directory of your standalone Tomcat installation. Tomcat will automatically detect the file, extract it, and deploy your REST endpoints in seconds.
Step 5: Testing Your REST Endpoints
Access your API by appending the WAR filename to your server URL, for example: http://localhost:8080/my-api-name/hello. If you see your REST response, your deployment was a success! You are now running Spring Boot like a pro.
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