FetchGroup getFetchGroup(
  Class cls, 
  String name
)

Get a modifiable FetchGroup for the Class and name. If a modifiable FetchGroup already exists in the PersistenceManager scope, return it. If not, create and populate a new FetchGroup from the existing definition in the PersistenceManager or PersistenceManagerFactory. If the definition for the FetchGroup is not in scope in either the PersistenceManager or PersistenceManagerFactory, create it with no members. The FetchGroup immediately becomes active and in scope of the PersistenceManager, and hides the corresponding fetch group in the PersistenceManagerFactory.