Java SE (Java Platform, Standard Edition)

Hi guys,
I'm using Javafx to develop an application. I'm creating views with fxml. I'm experiencing some memory problems perhaps because I can not understand the life cycle of the controller and the views.

For example, the listeners that I add in the controller to the components of ui, must be removed before going out from the view?

And in a case in which there is a inner listener? For example:

tabellaClienti.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<Cliente>() {
			@Override
			public void changed(ObservableValue<? extends Cliente> property, Cliente oldSelection, Cliente newSelection) {
				seleziona(newSelection);
			}
		});

in this case the listener when is destroyed?
I'm experiencing that I got the same view (with all components) in memory many times.

There is a guideline to follow to be sure to avoid making mistakes?

Thanks!