What are the states of objects in Hibernate ?

States of Hibernate instance

1. Transient

• Object just created but has no primary key / identifier
• Not associated with any session (persistence context)
• doesn’t represent any row of the database

2. Persistent

• Instance associated with a session , when you
• just saved instance in DB , or
• retrieved instance from the DB
• represents one row of the database

Changes to persistent objects are tracked by hibernate and are saved into database when commit call happen.

3. Detached

• Instance was associated with a session which has been closed
• Associated with a session in past but not currently - No longer persistent

After detached state, object comes to persistent state if we call lock() or update() or saveOrUpdate() method - reattach object to hibernate session