عرض عملي: إصلاح التحميل الكسول دون Open Session in View

خطوة بخطوة

1. Set spring.jpa.open-in-view=false; call an endpoint that returns an entity with lazy lines.
2. See LazyInitializationException in the response.
3. Planned mistake: change the relation to EAGER; show the extra queries everywhere.
4. Revert; add an entity graph or a DTO projection in the service method.
5. Return a response DTO built inside the transaction; the exception is gone and the query count is low.