Now I'm starting to doubt myself, I'm starting to think that the @Parameter will be null when the ajax method is invoked.
You will need to pass the droppablecontext in the AJAX event URL in a similar way to how the draggablecontext is passed. https://github.com/got5/tapestry5-jquery/blob/master/src/main/resources/org/got5/tapestry5/jquery/assets/mixins/zonedroppable/zonedroppable.js Perhaps this is back in the too-hard-basket. Sorry for the tease
