The Snippet to call Google Geocode API on Play framework(v2.1.0) .

Geocode.java

import org.codehaus.jackson.JsonNode;

import play.libs.WS;
import play.libs.F.Promise;
import play.libs.WS.WSRequestHolder;

/**
 * Refer 
 *     http://goo.gl/HXhJG
 *     Javadoc api/2.1.0/java/play/libs/WS.WSRequestHolder : http://goo.gl/AXmBY
 *     Javadoc api/2.1.0/java/play/libs/F.Promise : http://goo.gl/Ad3ec
 */
public class GeoCode {

    /** Endpoint for Google Geocode API . */
    private static final String GEOCODE_ENDPOINT = "http://maps.googleapis.com/maps/api/geocode/json";
    
    /**
     * Call Google Geocode API .
     * @params address : ex)東京都渋谷区宇田川町2-15
     * @return results value formatted with JSON 
     */
    public static JsonNode callGeocode(String address) throws RuntimeException {
        WSRequestHolder wsRequestHolder = WS.url(GEOCODE_ENDPOINT);
        wsRequestHolder.setQueryParameter("address", address);
    	wsRequestHolder.setQueryParameter("sensor", "false");
    		
    	Promise<WS.Response> geocode = wsRequestHolder.get();
    		
    	final String STATUS = geocode.get().asJson()
    				            .findPath("status").asText();
        JsonNode results = null;
        if (STATUS.equals("OK") {
            results = geocode.get().asJson()
                        .findPath("results");
            return results;
        } else {
            // TODO more implement .
            // Other status value is "ZERO_RESULTS" or "REQUEST_DENIED" .....
            throw new RuntimeException("fail to get results .");
        }
    }

}