ObjectDB ObjectDB

getReference(entityClass, primaryKey) - JPA EntityManager's method

T getReference(
  Class<T> entityClass,
  Object primaryKey

Get an instance, whose state may be lazily fetched. If the requested instance does not exist in the database, the EntityNotFoundException is thrown when the instance state is first accessed. (The persistence provider runtime is permitted to throw the EntityNotFoundException when getReference is called.) The application should not expect that the instance state will be available upon detachment, unless it was accessed by the application while the entity manager was open.
entityClass - entity class
primaryKey - primary key
the found entity instance
IllegalArgumentException - if the first argument does not denote an entity type or the second argument is not a valid type for that entity’s primary key or is null
EntityNotFoundException - if the entity state cannot be accessed
JPA 1.0