private Entry findEntry(Lease lease) throws UnknownLeaseException {
  Entry e=findEntryDo(lease);
  if (e != null && (e.renew < e.endTime || SystemTime.timeMillis() < e.endTime)) {
    return e;
  }
  throw new UnknownLeaseException();
}

private Entry findEntry ( Lease lease ) throws UnknownLeaseException { Entry e = findEntryDo ( lease ) ; if ( e != null && ( e . renew < e . endTime || SystemTime . timeMillis ( ) < e . endTime ) ) { return e ; } throw new UnknownLeaseException ( ) ; }
find a lease entry , throw exception if not found or expired normally
