T unwrap(
Class<T> cls
)
Return an object of the specified type to allow access to the provider-specific API. If the provider's EntityManagerFactory 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 underlying EntityManagerFactory implementation class or an interface that it implements.
- Return:
- an instance of the specified class
- Throws:
- PersistenceException - if the provider does not support the call
- Since:
- JPA 2.1