java - Bean Lifecycle Management Spring Boot -

i trying deploy spring boot application external tomcat instance, , running questions regarding how best manage instantiation of things.

as presently structured have along lines of

public class myclass extends springbootservletinitializer{   @bean public threadpool pool(){     return new threadpool(); }  @bean public backgroundthread setupinbox() {     backgroundthread inbox = new backgroundthread(pool());     inbox.start();     return inbox; }  @override protected springapplicationbuilder configure(springapplicationbuilder application) {     return application.sources(myclass.class); }  public static void main(string[] args) throws exception {     springapplication.run(myclass.class, args); }   } 

where backgroundthread thread listening amqp type messaging queue new jobs. know spring offers rabbitmq ways this, not using rabbit doesn't help.

the entire purpose of *.war file being deployed expose functionality wire via messaging, question best way instantiate, start , destroy backgroundthread through lifecycle of spring? xml configuration?

from docs:

the jsr-250 @postconstruct , @predestroy annotations considered best practice receiving lifecycle callbacks in modern spring application. using these annotations means beans not coupled spring specific interfaces.

for details see section 7.9.8, “@postconstruct , @predestroy”

those annotation meant put on init , cleanup methods:

@postconstruct public void initafterstartup() {     ... }  @predestroy public void cleanupbeforeexit() {     ... } 

also useful :

each springapplication register shutdown hook jvm ensure applicationcontext closed gracefully on exit. standard spring lifecycle callbacks (such disposablebean interface, or @predestroy annotation) can used.

in addition, beans may implement org.springframework.boot.exitcodegenerator interface if wish return specific exit code when application ends.