question: public ActivationGroupImpl ( ActivationGroupID id , MarshalledObject < ? > data ) throws RemoteException { super ( id ) ; groupID = id ; unexportObject ( this , true ) ; RMIServerSocketFactory ssf = new ServerSocketFactoryImpl ( ) ; UnicastRemoteObject . exportObject ( this , 0 , null , ssf ) ; if ( System . getSecurityManager ( ) == null ) { try { System . setSecurityManager ( new SecurityManager ( ) ) ; } catch ( Exception e ) { throw new RemoteException ( "unable to set security manager" , e ) ; } } }
target:  Creates a default activation group implementation.