code: @SuppressWarnings("unused")
  	private Boolean loadBooleanProperty(String propertyKey) {
  		String booleanPropValue = prop.getProperty(propertyKey);
  		if (booleanPropValue != null) {
  			return Boolean.parseBoolean(booleanPropValue.trim());
  		} else {
  			return null;
  		}
  	}
docs: Loads a property of the type Boolean from the Properties object
  
  @param propertyKey
  the property name
  
  @return the value