Object states in hibernate: Transient, Persistent and Detached

In hibernate, an object can have 3 states:

• Transient 
• Persistent 
• Detached 

Transient Object

• When an instance is created for an entity class using new() and has not been saved into the database is called Transient object. 
• This object has no association with the Session object. 
• Any modification done to this object does not make any reflections in the database since no row represents this object in the database. 

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Difference between save(), saveOrUpdate() and persist() in Hibernate Session

save()/ saveOrUpdate()/persist(), these methods are present in Hibernates’s Session interface. These methods serves the purpose of moving object’s state from new/transient to persistent state. However there are some differences between these 3 three APIs – one of popular interview question if you are a java developer. This post aims at listing out these differences.

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