private boolean extractRoute(long routeId) { Route route2 = entityManager.find(Route.class, routeId); if (route2 == null) { System.out.println("Entity extraction fail(route)"); return false; } System.out.println(route2.getAuthor()); System.out.println(route2.getMarkerMap().size()); for (MarkerModel value : route2.getMarkerMap().values()) { // System.out.println("ID "+(MarkerModel)value.toString()); System.out.println(value.getTitle()); } Gson gson = new Gson(); String ret = ""; ret = gson.toJson(route2); System.out.println("Marshalled route : " + ret); routeResponse = ret; return true; }