gwty-handsontable is wrapper for the famous maps javascript library HandsOnTable. gwty-handsontable is based on JsInterop and allows using HandsonTable from your GWT application exactly the same way as from a javascript script with a slight advantage: static typing. It was partially generated automatically from Leaflet docs.
##Dependency
Also, do not forget to include gwty-leaflet in your .gwt.xml module definition file:
<inherits name='com.gwidgets.api.GwtyHandsonTable' />
gwty-hansontable is compiled using GWT 2.8.0-rc2.