public static synchronized void unregisterTransactionServicePlugin(TransactionServicePlugin l){
  if (service_ != null) {
    service_.removeTSListener(l);
  }
  tsListenersList_.remove(l);
}

public static synchronized void unregisterTransactionServicePlugin ( TransactionServicePlugin l ) { if ( service_ != null ) { service_ . removeTSListener ( l ) ; } tsListenersList_ . remove ( l ) ; }
remove a transaction service listener .
