//(no need to load all destinations)
DestinationUID[] destIds = new DestinationUID[txnAcks.length];
for(int i=0;i<txnAcks.length;i++)
{
SysMessageID sid = txnAcks[i].getSysMessageID();
PacketReference p = Destination.get(sid);
DestinationUID destID = null;
if(p!=null)
{
destID = p.getDestinationUID();
}
else
{
logger.log(Logger.WARNING, "Could not find packet for "+sid);
}