Thymeleaf + Spring >>> copy checked values from HTML table

Everyone!

I'm new to Spring and Thymeleaf and I'm currently stuck. What I try ist to copy checked values from one HTML table to another (later on the values will be passed to be stored in MySQL table.

I tried different approaches but nothing works and I get exasperated with this problem. I really hope you can help me:

This Works: (it's not what's required though)

<tr th:id="${cList.zoneId}" th:each="cList, rowStat: ${countryZoneList}" class="clickable-row">
  <td><input th:for="${cList.zoneId}" type="checkbox" th:name="zones" th:value="${cList.zoneId}" /></td>
  <td th:text="${cList.zoneSymbol}"></td>
  <td th:text="${cList.zoneName}"></td>
  <td class="hiddenColumn" th:id="${cList.zoneId}"></td>
</tr>

:Controller:

 @RequestMapping(value="/confirmCountries", method = RequestMethod.GET)
    public String confirmCountriesPost(
            HttpServletRequest request,
            @ModelAttribute("zones") String zones,
            Model model, Principal principal
            ) throws Exception {

        System.out.println("zones: >>>>>>>>>>>>>>>>>>" + zones);

        return "my-dashboard";

    }

Here I get the expected printout: 3 (value from the first zoneId) I don't need the other values. I indeed need only the integer values, meaning the values of the 'selected' checkboxes.

What doesn't work

<tr th:id="${cList.zoneId}" th:each="cList, rowStat: ${countryZoneList}" class="clickable-row">
    <td><input th:for="${cList.zoneId}" type="checkbox" th:name="zones" th:value="${cList.zoneId}"/></td>
    <td th:text="${cList.zoneSymbol}"></td>
    <td th:text="${cList.zoneName}"></td>
    <td class="hiddenColumn" th:id="${cList.zoneId}"></td>
    </tr>

Neither works this:

    <tr th:id="${cList.zoneId}" th:each="cList, rowStat: ${countryZoneList}" class="clickable-row">
<td><input th:for="${cList.zoneId}" type="checkbox" th:field="*{zones}" th:value="${cList.zoneId}"/></td>
<td th:text="${cList.zoneSymbol}"></td>
<td th:text="${cList.zoneName}"></td>
<td class="hiddenColumn" th:id="${cList.zoneId}"></td>
</tr>

: Controller:

 @RequestMapping(value="/confirmCountries", method = RequestMethod.GET)
public String confirmCountriesPost(
        HttpServletRequest request,
        @ModelAttribute("zones") ArrayList<String> zones,
        Model model, Principal principal
        ) throws Exception {

    System.out.println("zones: >>>>>>>>>>>>>>>>>>" + zones.size());

    return "my-dashboard";

}

So here I try to store multiple values (the whole list) of selected values from the form to this ArrayList. The problem is, that even, when I check multiple checboxes ny ArrayList shows always the size of 1 (it stores only the first value). Where is the problem? Please help. How do I get the whole list of my 'cList.zoneI' values? Where is my mistake?

Thank you ion advance,

Dario