Guice Injector保持应用程序运行

guice 注入依赖项。我的IDE是IntelliJ 2017.2.5。当我运行以下代码时 main 方法继续运行,不会停止。当我删除DI时,进程停止 Process finished with exit code 0 .

主要的 方法:

public class Test {

@Inject
Provider<EntityManager> em;

public void test() {
    if(em.get().isOpen())
        System.out.println("EM open");
}

public static void main(String args[]) {
    final Injector injector = createInjector(new DatabaseModule());
    Test app = injector.getInstance(Test.class);
    app.test();
    System.out.println("Done");
}
}

DatabaseModule :

public class DatabaseModule extends AbstractModule {

private static final String PU_NAME = "my_pu";

@Override
protected void configure() {
    install(new JpaPersistModule(PU_NAME));
    bind(JPAInitializer.class).asEagerSingleton();
}

@Singleton
private static class JPAInitializer {
    @Inject
    public JPAInitializer(final PersistService service) {
        service.start();
    }
}

如果我执行 Test.main

EM open
Done

我该如何解决这个问题?