Cfrgtkky

How can I register/add a custom shutdown routine that shall fire when my Spring Boot application shuts down?

Scenario: I deploy my Spring Boot application to a Jetty servlet container (i.e., no embedded Jetty). My application uses Logback for logging, and I want to change logging levels during runtime using Logback's MBean JMX configurator. Its documentation states that to avoid memory leaks, on shutdown a specific LoggerContext shutdown method has to be called.

What are good ways to listen on Spring Boot shutdown events?

I have tried:

public static void main(String args) throws Exception {

    ConfigurableApplicationContext cac = SpringApplication.run(Example.class, args);



    cac.addApplicationListener(new ApplicationListener<ContextClosedEvent>() {



        @Override

        public void onApplicationEvent(ContextClosedEvent event) {

            logger.info("Do something");

        }

    });

}

but this registered listener does not get called when the application shuts down.

http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#boot-features-application-exit

Each SpringApplication will register a shutdown hook with the JVM to ensure that the ApplicationContext is closed gracefully on exit. All the standard Spring lifecycle callbacks (such as the DisposableBean interface, or the @PreDestroy annotation) can be used.

In addition, beans may implement the org.springframework.boot.ExitCodeGenerator interface if they wish to return a specific exit code when the application ends.

Your listener is registered too late (that line will never be reached until the context has already closed). It should suffice to make it a @Bean.

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;

import org.springframework.boot.web.support.SpringBootServletInitializer;

import org.springframework.context.annotation.Bean;



@SpringBootApplication

@EnableAutoConfiguration

public class Application extends SpringBootServletInitializer {



    public static void main(

            String args) {

        SpringApplication.run(Application.class,

                              args);

    }



    @NotNull

    @Bean

    ServletListenerRegistrationBean<ServletContextListener> myServletListener() {

        ServletListenerRegistrationBean<ServletContextListener> srb =

                new ServletListenerRegistrationBean<>();

        srb.setListener(new ExampleServletContextListener());

        return srb;

    }

}



 import javax.servlet.ServletContextEvent;

 import javax.servlet.ServletContextListener;



 public class ExampleServletContextListener implements ServletContextListener {

    @Override

    public void contextInitialized(

        ServletContextEvent sce) {

    // Context Initialised

    }



    @Override

    public void contextDestroyed(

        ServletContextEvent sce) {

       // Here - what you want to do that context shutdown    

   }

}

have you tried this as mentioned by @cfrick ?

@SpringBootApplication

@Slf4j

public class SpringBootShutdownHookApplication {



  public static void main(String args) {

    SpringApplication.run(SpringBootShutdownHookApplication.class, args);

  }



  @PreDestroy

  public void onExit() {

    log.info("###STOPing###");

    try {

      Thread.sleep(5 * 1000);

    } catch (InterruptedException e) {

      log.error("", e);;

    }

    log.info("###STOP FROM THE LIFECYCLE###");

  }

}