Clean JavaFX property listeners and bindings (memory leaks)

I haven't found a simple answer for these two questions:

1. do I have to remove a listener before deleting the property instance (the listener is not used anywhere else)?

   BooleanProperty bool = new SimpleBooleanProperty();
   bool.addListener(myListener);
   bool.removeListener(myListener); // is it necessary to do this?
   bool = null;
   

2. do I have to unbind a uni-directional bounded property before deleting the property instance?

   BooleanProperty bool = new SimpleBooleanProperty();
   bool.bind(otherBool);
   bool.unbind(); // is it necessary to do this?
   bool = null;