Persistence Context Introduction

What Is The Persistence Context

• Persistence context: The persistence context defines the set of active instances that the application is handling. The persistence context can be created manually or through injection.
  • The Persistence Context is responsible for JPA entity management: When an application loads an Entity from the database, the entity is in fact stored in the Persistence Context, so the entity becomes managed by the Persistence Context. Any further change made over that same entity will be monitored by the Persistence Context.
  • The Persistence Context will also flush changed entities to the database when appropriate. When a transaction commits, the associated Persistence Context will also flush any eventual pending changes to the Database.
  • We can understand like the persistence context is the first-level cache where all the entities are fetched from the database or saved to the database.

Persistence Context Types

• Persistence Context have two types:
  • Container Managed Persistence Context
  • Application Managed Persistence Context

See Also

• Entity
• Container Managed Persistence Context
• Application Managed Persistence Context