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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

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

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

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