About entities

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JPA Doc
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remove(entity)

Method javax.persistence.EntityManager void remove(   Object entity ) Remove the entity instance. Parameters: entity - entity instance Throws: IllegalArgumentException - if the instance is not an entity or is a detached entity TransactionRequiredException - if invoked on a container-managed entity
JPA Doc
41

contains(entity)

Method javax.persistence.EntityManager boolean contains(   Object entity ) Check if the instance is a managed entity instance belonging to the current persistence context. Parameters: entity - entity instance Returns: boolean indicating if entity is in persistence context Throws: IllegalArgumentException - if not an entity Since: JPA 1.0
JPA Doc
41

entity(cls)

Method javax.persistence.metamodel.Metamodel EntityType entity(   Class cls ) Return the metamodel entity type representing the entity. Parameters: cls - the type of the represented entity Returns: the metamodel entity type Throws: IllegalArgumentException - if not an entity Since: JPA 2.0
JPA Doc
41

from(entity)

Method javax.persistence.criteria.AbstractQuery Root from(   EntityType entity ) Create and add a query root corresponding to the given entity, forming a cartesian product with any existing roots. Parameters: entity - metamodel entity representing the entity of type X Returns: query root corresponding to the given entity Since: JPA 2.0
JPA Doc
41

isLoaded(entity)

Method javax.persistence.PersistenceUtil boolean isLoaded(   Object entity ) Determine the load state of an entity. This method can be used to determine the load state of an entity passed as a reference. An entity is considered loaded if all attributes for which FetchType.EAGER has been specified
JPA Doc
41

isLoadedWithReference(entity, attributeName)

Method javax.persistence.spi.ProviderUtil LoadState isLoadedWithReference(   Object entity,   String attributeName ) If the provider determines that the entity has been provided by ... . If a provider determines that the entity has been provided by itself and that either the entity attributes
JPA Doc
40

getLockMode(entity)

Method javax.persistence.EntityManager LockModeType getLockMode(   Object entity ) Get the current lock mode for the entity instance. Parameters: entity - entity instance Returns: lock mode Throws ... is not a managed entity and a transaction is active Since: JPA 2.0
JPA Doc
40

isLoaded(entity, attributeName)

Method javax.persistence.PersistenceUnitUtil boolean isLoaded(   Object entity,   String attributeName ) Determine the load state of a given persistent attribute of an entity belonging to the persistence unit. Parameters: entity - entity instance containing the attribute attributeName - name
Manual
40

Chapter 3 - Using JPA

Explains how to store, retrieve, update and delete entity objects using JPA.
Manual
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JPA Lifecycle Events

Callback methods are user defined methods that are attached to entity lifecycle events ... methods are methods that are defined within an entity class. For example, the following entity class defines all the supported callback methods with empty implementations: @Entity public static class