Enthuware

What's the difference of a new entity and a detached entity ? If for example the id isn't set as generated, it is written explicitly and the new entity has an Id set. How does he make the difference ?

• A new entity instance has no persistent identity, and is not yet associated with a persistence context.

• A detached entity instance is an instance with a persistent identity that is not (or no longer) associated with a persistence context.

Sect 3.2 of JSR317 Specification

Object identity does not equal Persistent identity

Hello ,

Regarding option two "If entityObject is already removed, IllegalStateException will be thrown."

I can't understand what is the difference between remove and detach , I think removing entity instance make it detached (Un managed by the PC).

Please explain

Removing an entity means you are removing the corresponding data from the database. Detaching it means the instance is not managed anymore by the persistence context. Detaching doesn't affect the database.