public void warn(Object m, Throwable t) {
    logger.warn(String.valueOf(m), t);
  }
public void warn(Object m, Throwable t) {
    logger.warn(String.valueOf(m), t);
  }
public void warn ( Object m , Throwable t ) { logger . warn ( String . valueOf ( m ) , t ) ; }
prints a warn message
@param m a log message
@param t a throwable error
prints a warn message