java - 扩展SpringBootInitializer时，为什么要覆盖configure方法？

Question

众所周知，要发布 Spring Boot war ，我们应该扩展 SpringBootServletInitializer，然后重写配置方法，如下所示:

@SpringBootApplication
public class DemoApplication extends SpringBootServletInitializer {
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(DemoApplication.class);
    }
}

我把重写的配置方法注释掉，然后应用程序运行无异常。那我为什么要重写configure方法，它的用法是什么？

Answer 1

The main method initializes an application context via a factory method inside SpringApplication. It is using Spring Boot’s SpringApplication.run() method to launch the application. The configure method inherited from SpringBootServletInitializer does essentially the same but only when deployed as a war file.