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
This documentation page is derived (with some adjustments) from the open source JPA 2 RI (EclipseLink)
and is available under the terms of the Eclipse Public License, v. 1.0 and Eclipse Distribution License, v. 1.0.
and is available under the terms of the Eclipse Public License, v. 1.0 and Eclipse Distribution License, v. 1.0.
Object Relational Mapping (ORM) JPA 2 providers include Hibernate, EclipseLink, TopLink, OpenJPA and DataNucleus.
ObjectDB is not an ORM JPA implementation but an Object Database for Java with built in JPA 2 support.
