unwrap(cls) - JPA EntityManager's method
Method javax.persistence.EntityManager
T unwrap(
Class<T> cls
)
Return an object of the specified type to allow access to the provider-specific API. If the provider's
EntityManager implementation does not support the specified class, the PersistenceException is thrown. - Parameters:
-
cls- the class of the object to be returned. This is normally either the underlyingEntityManagerimplementation class or an interface that it implements.
- Returns:
- an instance of the specified class
- Throws:
-
PersistenceException- if the provider does not support the call
- Since:
- JPA 2.0
