Not getting result from list

Hi,

I want to display data of list and I have a method inside model like this logs are printing

public List<Double> getListOfValues() throws JSONException, IOException {
   listOfValues=gpsservice.geDataOfWeather(latitudeVal,LongitudeVal,cityVal);
   log.info("arraylist inside getter from service inside list method"+listOfValues);
   return listOfValues;
}

 But I checked whether values are there in list in this method

public String getCity() throws JSONException, IOException {
   city=cityVal;
   log.info("city inside getter of cityval" + city);
   listOfValues=gpsservice.geDataOfWeather(latitudeVal,LongitudeVal,cityVal);
   log.info("arraylist inside getter from service"+listOfValues);
   return city;

}

 There are values in logs of getCity()  but inside list method[getListOfValues()] Its not printing logs

this is the code I have in sigthly

<sly data-sly-use.GpsLocation="${'com.yppocsite.core.models.GpsLocation'}"></sly>
<h1>Weather</h1>
<h2>city using sly : ${GpsLocation.city}</h2>
<div data-sly-use.collect="com.yppocsite.core.models.GpsLocation">
<div data-sly-list.item="${collect.listOfValues}"></div>
<h2>List using div : ${item}</h2>
</div>
</div>

even itsnot entering inside div also can anyone help me on this.