Spring Boot - Wait for web server to start

Question

In my Spring Boot application I need to wait until the (default Tomcat) web server is fully initialized and ready to take traffic before I send messages to other application

Answer 1

Since Spring Boot 1.3.0 this can also be accomplished by implementing ApplicationListener

example:

public class MyApplicationListener implements ApplicationListener, Ordered {

    @Override
    public void onApplicationEvent(ApplicationReadyEvent event) {
        //do stuff now that application is ready
    }

    @Override
    public int getOrder() {
        return Ordered.LOWEST_PRECEDENCE;
    }
}

Also, as mentioned in the accepted answer, you can create a file named src/main/resources/META-INF/spring.factories listing your ApplicationListener. For example:

org.springframework.context.ApplicationListener=com.example.MyApplicationListener

however, in my case, I only needed this listener to run under a specific profile

so I added the following property to application-.properties

context.listener.classes=com.example.MyApplicationListener