JPA - Managed Entity
About
future updates to the entity will be tracked.
The behavior is undefined if the same Java instance is made managed in more than one
persistence context
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Management
Contains
The contains() method can be used to determine whether an entity instance is managed in the current
persistence context.
The contains method returns true:
If the entity has been retrieved from the database or has been returned by getReference, and has not been
removed or
detached.
If the entity instance is new, and the
persist method has been called on the entity or the persist operation has been
cascaded to it.
The contains method returns false:
Documentation / Reference