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 EntityManager or an interface it implements.

Returns:

an instance of the specified class.

Throws:

PersistenceException - if the provider does not support the given type.

Since:

Jakarta Persistence (JPA) 2.0