- https://chatgpt.com/c/831f36a0-bce4-4372-87d4-9ab6528babc5¶

sb-starter-web¶

A. features¶

necessary dependencies (jackson, springMVC),
embedded server
default exception
Actuator

B. useful customization class¶

1. class: WebServerFactoryCustomizer¶

interface provided by Spring Boot
allows you to customize the configuration of embedded web servers
setting ports,
enabling SSL,
configuring timeouts

@Component
public class MyTomcatCustomizer implements WebServerFactoryCustomizer<TomcatServletWebServerFactory> {

    @Override
    public void customize(TomcatServletWebServerFactory factory) 
    {
        factory.setPort(8081);  
        factory.setContextPath("/myapp");  

        // Additional customization can be done here
        factory.addConnectorCustomizers(connector -> {

        });

        // SSl
        Ssl ssl = new Ssl();
            ssl.setKeyStore("classpath:keystore.jks");
            ssl.setKeyStorePassword("password");
            ssl.setKeyPassword("password");
        factory.setSsl(ssl);
    }
}

2. class: ServletRegistrationBean¶

Register a New Servlet (spring boot way)
similarly have @Bean FilterRegistrationBean<MyFilter>

@Configuration
public class ServletConfig 
{
    @Bean
    public ServletRegistrationBean<CustomServlet> customServletRegistrationBean() 
    {
        ServletRegistrationBean<CustomServlet> registrationBean = new ServletRegistrationBean<>(new CustomServlet(), "/custom");
        registrationBean.setLoadOnStartup(1);
        return registrationBean;
    }
}

3. Class: SpringBootServletInitializer¶

used when you want to deploy a Spring Boot application to an external servlet container
check below for more.

C. Typical things:¶

1. update embedded server¶

update pom
add spring-boot-starter-undertow / spring-boot-starter-jetty
exclude <spring-boot-starter-tomcat from spring-boot-starter-web

2. shut down project¶

ApplicationContext context = SpringApplication.run(DemoApplication.class, args);
context.close();

3. Remove any embedded Server / Deploy on external Server¶

remove dependencies for embeded server
change to war : war

extend SpringBootServletInitializer -> override Configure.

   @SpringBootApplication
   public class DemoApplication extends SpringBootServletInitializer {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(DemoApplication.class);
    }
}