Is it permissible to declare a class as final when using it as an Entity in JPA?

Declaring a class as final when using it as an Entity in JPA is not recommended. JPA often uses proxies and inheritance to implement lazy loading and other mechanisms. If the class is final, inheritance is impossible, which can lead to issues with the framework's operation.

Therefore:

• Entity classes are usually not declared as final.
• If you need to restrict inheritance, it's better to use other approaches, but final can disrupt JPA's work.

An exception might be when you are sure that proxies are not needed and you do not use lazy loading, but this is a rare case.