What can make an object non-transactional?

Question

I am reading about JPA, when I came across POJO properties that makes it a jpa entity and one of the properties is "it should be transactional" which means -according to the book- : changes made to the database either succeed or fail atomically, so the persistent view of an entity should indeed be transactional.

And my question is : what in a java object might make it non transactional?

Answer 1

What can make an object non-transactional?

--> No using annotation @Transactional in Java POJO class.