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

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