public byte[] readPersistentBytes(String key){
  try {
    if (checkService()) {
      return sService.readPersistentBytes(key);
    }
  }
 catch (  RemoteException e) {
  }
  return null;
}

public byte [ ] readPersistentBytes ( String key ) { try { if ( checkService ( ) ) { return sService . readPersistentBytes ( key ) ; } } catch ( RemoteException e ) { } return null ; }
read a byte array from persistent storage
