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JPA Tutorials
JPA Tutorials - Entity Operations
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Persisting Entities
Removing Entities
Flushing Persistence Context
Refreshing an Entity Instance
Detaching an Entity Instance from the Persistence Context
Merging Detached Entity State
Detached Entities and Lazy Loading
Getting Entity's Lazy Proxy with EntityManager.getReference()
Efficiently Persisting @OneToOne association with the proxy returned by EntityManager.getReference()
Efficiently Persisting @ManyToOne associations with proxy returned by EntityManager.getReference()
Getting Entity's Managed State with EntityManager.contains()
Getting Entity's Load State with PersistenceUtil.isLoaded()
Using PersistenceUtil.isLoaded() and EntityManager.contains() to load lazy attributes of a detached entity
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