code: public void setVelocityPropertiesMap(Map<String, Object> velocityPropertiesMap) {
  		if (velocityPropertiesMap != null) {
  			this.velocityProperties.putAll(velocityPropertiesMap);
  		}
  	}
docs: Set Velocity properties as Map, to allow for non-String values
  like "ds.resource.loader.instance".
  @see #setVelocityProperties