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Create WAR file in Spring Boot

This is just a three step simple procedure to package your application into war.

  1. Extending Main Class

    First, we extend our main class to SpringBootServletInitializer. This tells spring that your main class will be the entry point to initialize your project in server.
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    @SpringBootApplication
    public class Application extends SpringBootServletInitializer{
     
        public static void main(String[] args) {
            SpringApplication.run(Application.class, args);
        }
    }

  2. Overriding configure method

    Next, we overload the configure method of SpringBootServletInitializer. We tell spring to build the sources from our Main class. Your final Main class should look like this:
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    @SpringBootApplication
    public class Application extends SpringBootServletInitializer{
     
        public static void main(String[] args) {
            SpringApplication.run(Application.class, args);
        }
     
        @Override
        protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
            return builder.sources(Application.class);
        }
    }

  3. Configure Packaging to WAR

    Finally, we tell maven to package the project into WAR. In your pom.xml, change the attribute value for packaging from jar to war
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    <packaging>war</packaging>
    Then try to build your project using:
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    mvn package
    For Gradle Project, please see this Packaging executable jar and war files in the Gradle link to configure .gradle file to build war file.
With this, you can now package your application with jar or war file. Just change the packaging to either jar or war. And also you can still run your main method in your IDE to develop the application.

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