public void setDevice(DeviceDesc desc) { this.device = desc; service.getMediaSources( new AsyncCallback<Set<String>>() { public void onFailure(Throwable caught) { // Show the RPC error message to the user System.out.println("FAILURE!!!"); } public void onSuccess(Set<String> result) { System.out.println("RESPONSE=" + result); Iterator<String> it = result.iterator(); while (it.hasNext()) { source.addItem(it.next()); } DomEvent.fireNativeEvent(Document.get().createChangeEvent(), source); } }); }