Why does Spring Boot block threads?

Asked Sep 25 '19 at 14:08

Active Sep 25 '19 at 14:21

Viewed 41 times

I tried to create a socket thread inside Spring Boot. This is the initial start up class in Spring Framework.

@Component
public class InitialStartUp implements ApplicationListener<ContextRefreshedEvent> {

    private Logger logger = LoggerFactory.getLogger(getClass());


    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {

        // Start the Socket server
        try {
            ListenerSocket listenerSocket = new ListenerSocket();
            listenerSocket.run();
            logger.info("Starting listener socket server"); // <-- Never called
        } catch (Exception e) {
            logger.info(e.getMessage());
        }

    } 
}

But the problem is that the logger.info method above will never be called. Why? Spring Boot run the listenerSocket thread, but never "goes out" from it. Why?

Is there some way I can do to make the logger.info be called?

edited Sep 25 '19 at 14:21

Andrew Tobilko

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asked Sep 25 '19 at 14:08

euraad

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Note that you start a `Thread` by calling `start()`, not `run()` . – Arnaud Sep 25 '19 at 14:10
@Arnaud Hmm...that seems to be the problem. Thank you. – euraad Sep 25 '19 at 14:17
Also note that right now each context refresh will start a new thread, when logically I'd expect it to check and stop previous one as well. – M. Prokhorov Sep 25 '19 at 14:21

Why does Spring Boot block threads?

0 Answers0