Unable to get thymeleaf form data in spring mvc

I am new to Thymeleaf, I try to execute a simple form submittion example using Thymeleaf and Spring MVC. I wrote the code according to Thymeleaf documentation. But I am getting null values in the controller.

<form action="thymeleafexample/thymeleaf.html" th:action="@{/thymeleaf}"
      th:object="${loginModel}" method="post">
    <table>
        <tr>
            <td th:text="#{emp.empId.label}">Emp ID</td>
            <td><input type="text" th:field="*{empId}"/></td>
        </tr>
        <tr>
            <td th:text="#{emp.empName.label}">Emp Name</td>
            <td><input type="text" th:field="*{empName}"/></td>
        </tr>
        <tr>
            <td>
                <button type="submit" name="save" th:text="#{${'.emp.button.label'}}">submit</button>
            </td>
        </tr>
    </table>
</form>

and my Controller is

@RequestMapping(value = "/thymeleaf", params = {"save"})
public String save(@Validated LoginModel loginModel, final BindingResult bindingResult, ModelMap model) {
    if (bindingResult.hasErrors()) {
        return "thymeleaf";
    }
    System.out.println(loginModel);
    System.out.println(loginModel.getEmpName());
    return "/thymeleaf";
}

and my Model class is

public class LoginModel {

    private String empName;
    private int empId;

    public void setEmpId(int empId) {
        this.empId = empId;
    }

    public int getEmpId() {
        return empId;
    }

    public String getEmpName() {
        return empName;
    }

    public void setEmpName(String empName) {
        this.empName = empName;
    }
}