@Override public void trace(String msg,Throwable t){
  if (logger.isLoggable(Level.FINEST)) {
    log(SELF,Level.FINEST,msg,t);
  }
}

@ Override public void trace ( String msg , Throwable t ) { if ( logger . isLoggable ( Level . FINEST ) ) { log ( SELF , Level . FINEST , msg , t ) ; } }
log an exception ( throwable ) at level finest with an accompanying message .
