T unwrap(
Class<T> cls
)
Return an object of the specified type to allow access to a provider-specific API. If the provider implementation of
EntityManager does not support the given type, the PersistenceException is thrown. - Parameters:
cls- the class of the object to be returned. This is usually either the underlying class implementing {@code EntityManager} or an interface it implements.
- Return:
- an instance of the specified class
- Throws:
- PersistenceException - if the provider does not support the given type
- Since:
- JPA 2.0