fixed minor checkstyle problems

src/main/java/it/unibz/inf/isoga/web/JsonWebsocket.java

 package it.unibz.inf.isoga.web;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.MapperFeature;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
 import it.geosolutions.geoserver.rest.GeoServerRESTPublisher;
 import it.unibz.inf.isochrone.config.ConfigIsochrone;
 import it.unibz.inf.isoga.config.ConfigClient;
@@ -39,11 +44,6 @@ import javax.websocket.server.ServerEndpoint;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.JsonNode;
-import com.fasterxml.jackson.databind.MapperFeature;
-import com.fasterxml.jackson.databind.ObjectMapper;
-
 @ServerEndpoint(value = "/websocket")
 public class JsonWebsocket {
 	private static final Logger LOGGER = LoggerFactory.getLogger(JsonWebsocket.class.getName());
@@ -90,10 +90,10 @@ public class JsonWebsocket {
 	}
 
 	@OnError
-    public void onError(final Session session, final Throwable throwable) {
-    	LOGGER.warn("Error for client \"" + session.getId() + "\"");
-    	throwable.printStackTrace();
-    }
+	public void onError(final Session session, final Throwable throwable) {
+		LOGGER.warn("Error for client \"" + session.getId() + "\"");
+		throwable.printStackTrace();
+	}
 
 	@OnMessage
 	public <S extends IService<T, U>, T extends IRequest, U extends IResponse> String onMessage(final Session session, final String message) {
@@ -139,7 +139,7 @@ public class JsonWebsocket {
 		return request;
 	}
 
-    private static <S extends IService<T, U>, T extends IRequest, U extends IResponse> S createService(final ObjectMapper mapper, final String msg)
+	private static <S extends IService<T, U>, T extends IRequest, U extends IResponse> S createService(final ObjectMapper mapper, final String msg)
 			throws IllegalRequestException, InternalSocketException {
 		final boolean emptyRequest = (msg == null || msg.trim().length() <= 0);
 		if (emptyRequest) {