Lifecycle

JPA entities go through a series of states as they are modified.

States

State	Description
New	Doesn't exist in the DB as is not handled by the entity manager
Managed	Persisted into DB and handled by the entity manager
Detached	Removed from the entity manager, but still persisted in the DB
Removed	Deleted from the DB

Only the managed and removed states interact directly with the database. This requires an open transaction to work.

Callback Methods

There is a series of annotations, such as @PrePersist or @PostLoad, which can be used to interact with persistence events through callback methods.

These can be useful for auditing or initializing values.

More Information

• Managed Entity Objects