@RequestMapping(value="updateCustomer", method=RequestMethod.GET)
public String updateCustomer(@RequestParam("firstName") String firstName,
        @RequestParam("lastName") String lastName,  @RequestParam("email") String email, Model model)
{
    Customer customer = new Customer(firstName, lastName, email);

    model.addAttribute("customer", customer);

    return "update-customer";
}

<td>
    <a href="localhost:8080/CustomerRelationshipManagement/updateCustomer?firstName=${temp.firstName}&lastName=${temp.lastName}&email=${temp.email}">Update</a>
 </td>