spring+ thymeleaf unable to update - spring-mvc

Question

Hi I am working with spring MVC and thymeleaf and I am not able to update data from my controller as I have following code.The main problem I am facing is that my put method is not getting called.
#GetMapping("/{id}/edit")
public String editUser(#PathVariable("id") int id, Model model) {
logger.info("++++++++++++[edit User]\n\n" + userService.findById(id));
model.addAttribute("user", userService.findById(id));
return "user/edit";
}
#PutMapping("/{id}/edit")
public String updateUser(#PathVariable("id") int id, #ModelAttribute("user") User user, Model model) {
logger.info("\n\n+++++++++++++++++inside Update");
User toUpdate = userService.findById(user.getId());
user.setUserName(user.getUserName() != null ? user.getUserName() : toUpdate.getUserName());
user.setName(user.getName() != null ? user.getName() : toUpdate.getName());
logger.info(user.toString());
userService.updateUser(user);
model.addAttribute("user", userService.findById(user.getId()));
return "redirect:/user/" + id;
}
and my html page
<form action="#" th:action="#{/user/__${user.id}__}" method="put"
th:object="${user}">
<div class="form-group">
<label for="txtUserName">User-name</label> <input
class="form-control" id="txtUserName" placeholder="User Name"
th:feild="${user.userName}" />
</div>
<div class="form-group">
<label for="txtName">First Name</label> <input
class="form-control" id="txtName" placeholder="Full Name"
th:feild="${user.name}" />
</div>
<div class="form-group">
<label for="calDob">Date of Birth</label> <input
class="form-control" id="calDob" placeholder="dd/MM/yyyy" />
</div>
<button type="submit" th:method="put" class="btn btn-success">Update</button>
<a href="#" th:href="#{/user/__${user.id}__}"
class="btn btn-primary">Cancel</a> <a th:method="delete"
href="javascript:deleteUser('${user.id}');" class="btn btn-danger">Delete</a>
</form>
any help will be usefull thanks

Answer 1

PUT is not a valid argument for method attibute of the form tag. See HTML specification.
Valid methods are GET and POST. And as it's not a REST API, you can use POST method to update.
So just update your mapping from:
#PutMapping("/{id}/edit")
to
#PostMapping("/{id}/edit")
And form tag to:
<form action="#" th:action="#{/user/__${user.id}__}/edit" method="post" th:object="${user}">