See the javadoc for info on setting up your Google Maps api key. This will fail when running on a local instance without configuring your api key.
Center Map on Address:

This map is instantiated on an address and demonstrates using AjaxGMap and AjaxGMarker to interact with form elements. It's size is passed in as a binding.

This map demonstrates using the AjaxGMarker component to place marker overlays on the map. The size for this map is set using CSS.