if (log.isTraceEnabled())
if (trace)
   private void setCurrentTransactionId(final Xid xid)   {      if (xid == null)         throw new org.jboss.util.NullArgumentException("xid");      if (log.isTraceEnabled())      {         log.trace("Setting current tx xid=" + xid + " previous: " + sessionState.getCurrentTxId() + " " + this);      }      sessionState.setCurrentTxId(xid);   }