HTTP Status 405 - Request method 'POST' not supported (Spring MVC)

I am not sure if this helps but I had the same problem.

You are using springSecurityFilterChain with CSRF protection. That means you have to send a token when you send a form via POST request. Try to add the next input to your form:

<input type="hidden" name="${_csrf.parameterName}" value="${_csrf.token}"/>

Check if you are returning a @ResponseBody or a @ResponseStatus

I had a similar problem. My Controller looked like that:

@RequestMapping(value="/user", method = RequestMethod.POST)
public String updateUser(@RequestBody User user){
    return userService.updateUser(user).getId();
}

When calling with a POST request I always got the following error:

HTTP Status 405 - Request method 'POST' not supported

After a while I figured out that the method was actually called, but because there is no @ResponseBody and no @ResponseStatus Spring MVC raises the error.

To fix this simply add a @ResponseBody

@RequestMapping(value="/user", method = RequestMethod.POST)
public @ResponseBody String updateUser(@RequestBody User user){
    return userService.updateUser(user).getId();
}

or a @ResponseStatus to your method.

@RequestMapping(value="/user", method = RequestMethod.POST)
@ResponseStatus(value=HttpStatus.OK)
public String updateUser(@RequestBody User user){
    return userService.updateUser(user).getId();
}