I have a simple Spring application that needs to save state to some files after being killed, but calling kill [PID] on Debian 10 will not trigger the @PreDestroy method I have registered. Here’s my state class and main class:

@Component
@Scope(value = ConfigurableBeanFactory.SCOPE_SINGLETON)
public class GlobalState {
    private VerificationTokens verificationTokens;

    @PreDestroy
    public void onDestroy() {
        System.out.println("Saving state...");

        try {
            //write to files
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @PostConstruct
    public void postConstruct() {
        try {
            //load from files
        } catch (IOException e) {
            System.err.println("Failed to load saved application state");
            e.printStackTrace();
        }
    }
}

@SpringBootApplication
@EnableScheduling
public class CrewsApplication {
    public static void main(String[] args) {
        initializeDirectories();
        SpringApplication.run(MyApplication.class, args);
    }

    public static void initializeDirectories() {
        File state = new File("./state");
        if (!state.exists()) state.mkdirs();
    }
}

The hook will run in my IDE (IntelliJ IDEA) after stopping the application, but won’t when I kill the process after deploying it on Linux. I’ve already added the -Xcs JVM argument to toggle off thread dumps instead of killing the program. Why isn’t this working?