eclipse-link

What is JPA's "Optimistic Locking Field" and what is it for? I noticed that there is this option for Eclipse Link and Hibern ... m item) { this.item = item; this.id = item.getSKU(); } } Eclipse documentation link quoting is option

I am using JSF in a faculty subject and the professor passed an activity. But I am not being able to record information from ... ger(); } } Error occurs on line: EntityManagerFactory emf = Persistence.createEntityManagerFactory("RestManagerPU");