In this post, I will guide you for implementing a Spring Boot application on Tomcat Server.

The capacity of the Tomcat is only about 10MB, and an open source Java Web Server.

If not, you can refer to Tomcat installations as in the following post.

With this file you can run the application directly without needing to deploy it on any Web Server.

The Executable JAR file may not be compatible with all Web servers, therefore, you want to deploy it on a particular Web server, you need to package the Spring Boot application into a WAR file.

I have a Spring Boot project here, developed by Eclipse IDE.

When creating the Spring Boot project, you have 2 choices to pack this project such as WAR or JAR.

The WAR files are suitable for being deployed on Web Servers.

While, if you create a Spring Boot project with the Packaging Jar choice, only one AbcApplication class will be created.

When the Spring Boot application is packed into the JAR file, it can be independently executabe without being deployed on any Web Server.

But the JAR file is not suitable to be deployed on Web Servers.

If you have an available Spring Boot, you need to correct packaging method into WAR.

On the Eclipse, open the pom.xml file, and change packaging method into war.

If your project doesnt have a ServletInitializer class, create it.

If there are more than one Application class in your project, please tell the Spring Boot which class will be used for your application.

You have to ensure that your Eclipse is using JDK instead of JRE.

At this moment, you will have a WAR file in the target folder of the project, you can use this file to deploy on the Tomcat Server.

Install Spring Tool Suite Ubuntu Server