How to ensure access to object data within a method using the @Transactional annotation?

The @Transactional annotation is commonly used in Spring to manage transactions. To ensure access to an object's data within a method annotated with @Transactional, it is important to remember that Spring creates proxies to handle transactions.

Main recommendations:

• The method with @Transactional should be called from outside the class so that the proxy can intercept the call and start a transaction.
• If a method with @Transactional is called directly within the class (via this), the transaction will not be applied.
• To access the object's data inside a transactional method, use class fields or method parameters.

Example:

@Service
public class MyService {

    @Transactional
    public void transactionalMethod() {
        // access to object data
        this.someField = "value";
        // database operations
    }

}

If you need to call a transactional method from another method within the same class, it is better to inject the proxy via the Spring Context or use self-injection.