advanced patterns with CompletableFuture and Spring Boot Transaction Management
I'm trying to debug I've searched everywhere and can't find a clear answer. I'm working with an scenario with using `CompletableFuture` in my Spring Boot application that involves transactional behavior. I have a service method annotated with `@Transactional` that processes some data and then kicks off a long-running task using `CompletableFuture`. The question arises when I try to access the database in the asynchronous task. The transaction seems to be committed before the `CompletableFuture` completes, leading to unexpected behavior. Here's a simplified version of my code: ```java @Service public class MyService { @Autowired private MyRepository myRepository; @Transactional public CompletableFuture<String> processData(String input) { MyEntity entity = new MyEntity(input); myRepository.save(entity); return CompletableFuture.supplyAsync(() -> { // This should access the saved entity MyEntity savedEntity = myRepository.findById(entity.getId()).orElse(null); return savedEntity != null ? savedEntity.getData() : "Entity not found"; }); } } ``` When I call `processData`, I expect to retrieve the saved entity in the asynchronous task. Instead, I get `Entity not found`, which indicates that the transaction has already completed and the entity is not visible in the new thread context. I tried using `@Transactional(propagation = Propagation.REQUIRES_NEW)` on the `CompletableFuture` method, but that resulted in a `TransactionTimedOutException` due to the long-running nature of the process. What is the best way to handle this situation? Is there a recommended practice to ensure that the entity is accessible within the async task without running into transaction issues? I'm working on a web app that needs to handle this. I'm working in a Windows 10 environment. Thanks in advance! My team is using Java for this web app. Any ideas how to fix this?