code: public void setFile(String file) throws ApplicationException {
  	if (StringUtil.isEmpty(file)) return;
  
  	if (file.indexOf('/') != -1 || file.indexOf('\\') != -1)
  	    throw new ApplicationException("value [" + file + "] from attribute [file] at tag [log] can only contain a filename, file separators like [\\/] are not allowed");
  	if (!file.endsWith(".log")) file += ".log";
  	this.file = file;
      }
docs: set the value file
  
  @param file value to set
  @throws ApplicationException