find(entityClass, primaryKey) - JPA EntityManager's method
Method
javax.persistence.EntityManager
T find(
Class<T> entityClass,
Object primaryKey
)
Find by primary key. Search for an entity of the specified class and primary key. If the entity instance is contained in the persistence context, it is returned from there.
- Parameters:
-
entityClass- entity class -
primaryKey- primary key
- Returns:
- the found entity instance or null if the entity does not exist
- Throws:
-
IllegalArgumentException- if the first argument does not denote an entity type or the second argument is is not a valid type for that entity’s primary key or is null
- Since:
- JPA 1.0
