Example1.java

@Service
public class Example1Service {
  @Transactional
  public void doSomethingTransactional() {
    ...
  }
  
  @Transactional
  protected void doSomethingTransactionalProtected() {
    ...
  }
  
  public void doSomethingWithTransactional() {
    doSomethingTransactional()  // WRONG!!! not transactional
  }
}

@Service
public class Example2Service {
  @Inject
  Example1Service service;
  
  public void doSomethingWithTransactional() {
    service.doSomethingTransactionalProtected()  // WRONG!!! not transactional
    service.doSomethingTransactional()  // OK transactional
  }
}

Example2.java

@Component
public class MyListener {
  
    @EventListener
    public void handleContextRefresh(ContextRefreshedEvent event) {
        ...
    }
}

@Component
public class MyComponent {
  
  @EventListener(condition = "#creationEvent.awesome")
  public void handleOrderCreatedEvent(CreationEvent<Order> creationEvent) {
    ... 
  }

}

@Component
public class MyComponent {

    private final ApplicationEventPublisher publisher;
    
    @Autowired
    public MyComponent(ApplicationEventPublisher publisher) { ... }
    
    public void createOrder(Order order) {
        // ....
        this.publisher.publishEvent(new OrderCreatedEvent(order)); 
    }

}

@Component
public class MyComponent {
  
  @TransactionalEventListener(condition = "#creationEvent.awesome")
  public void handleOrderCreatedEvent(CreationEvent<Order> creationEvent) { 
    ...
  }

}

@TransactionalEventListener is a regular @EventListener and also exposes a TransactionPhase, the default being AFTER_COMMIT. You can also hook other phases of the transaction (BEFORE_COMMIT, AFTER_ROLLBACK and AFTER_COMPLETION that is just an alias for AFTER_COMMIT and AFTER_ROLLBACK).

By default, if no transaction is running the event isn’t sent at all as we can’t obviously honor the requested phase, but there is a fallbackExecution attribute in @TransactionalEventListener that tells Spring to invoke the listener immediately if there is no transaction.
  

Threads

ThreadLocal
InheritableThreadLocal

CredentialsFilter
HandlerInterceptorAdapter
RestTemplate ClientHttpRequestInterceptor
Rabbitmq MessageListener ja MessagePostProcessor
@Scheduler ScheduledThreadPoolExecutor
@Async CredentialsAwareTaskDecorator
parallel DelegatingCredentialsCallable