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null is returned. A similar method, getReference , can be considered the lazy version of find : Employee employee = em. getReference (Employee.class, 1); The getReference method works like the find ... accessed. The getReference method is useful when a reference to an entity object is required but not

JPA Method in javax.persistence.EntityManager T getReference (   Class  entityClass,    Object primaryKey ) Get an instance, whose state may be lazily fetched ... the EntityNotFoundException when getReference is called.) The application should not expect

to instantiate component view at org.jboss.as.ee.component.ViewManagedReferenceFactory. getReference ... :7.1.1.Final] at org.jboss.as.ee.component.ViewManagedReferenceFactory. getReference ... . getReference (ViewManagedReferenceFactory.java:52) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final] at org

.0 T getReference (Class  entityClass, Object primaryKey) Get an instance, whose state ... is permitted to throw the EntityNotFoundException when getReference is called.) The application

reference obtained by EntityManager. getReference is accessed but the entity does not exist. Thrown ... to it, will be marked for rollback. See Also: EntityManager. getReference EntityManager.refresh EntityManager

to use isMember I have to use: Attribute attributeLastName = em. getReference (Attribute.class

instances (possibly using em. getReference ) rather than create new Category instances

that operation, so find is expected to be a bit faster in that case (and check also getReference