Javadoc
If the provider determines that the entity has been provided by itself
and that the state of all attributes for which FetchType EAGER has been
specified have been loaded, this method returns LoadState.LOADED. If the
provider determines that the entity has been provided by itself and that
not all attributes with FetchType EAGER have been loaded, this method
returns LoadState.NOT_LOADED. If the provider cannot determine if the
entity has been provided by itself, this method returns
LoadState.UNKNOWN. The provider's implementation of this method must not
obtain a reference to any attribute value, as this could trigger the
loading of entity state if the entity has been provided by a different
provider.