What is Persistence Context?

Question

I am new to the Java world and JPA. I was studying JPA and came across many new terms like Entity, persistence. While reading, I could not understand the exact definition fo

Answer 1

In layman terms we can say that Persistence Context is an environment where entities are managed, i.e it syncs "Entity" with the database.

Answer 2

Taken from this page:

Here's a quick cheat sheet of the JPA world:

• A Cache is a copy of data, copy meaning pulled from but living outside the database.
• Flushing a Cache is the act of putting modified data back into the database.
• A PersistenceContext is essentially a Cache. It also tends to have it's own non-shared database connection.
• An EntityManager represents a PersistenceContext (and therefore a Cache)
• An EntityManagerFactory creates an EntityManager (and therefore a PersistenceContext/Cache)

Answer 3

Both the org.hibernate.Session API and javax.persistence.EntityManager API represent a context for dealing with persistent data.

This concept is called a persistence context. Persistent data has a state in relation to both a persistence context and the underlying database.