@RestController
@RequestMapping("/v3/users")
public class UserController {

...

    @RequestMapping(value = "/{userId}/reset_password", method =     RequestMethod.POST)
    @ResponseBody
    public ResponseEntity<Void> resetPassword(
        @PathVariable("userId") Long userId, @RequestBody     UserPasswordResetRequestDTO data,) {
        // Logic here
        return new ResponseEntity<Void>(HttpStatus.NO_CONTENT);
    }
}

public class UserPasswordResetRequestDTO {

    private Long userId;
    private String oldPassword;
    private String newPassword;

    // Getters and setters

}

POST /v3/users/6/reset_password HTTP/1.1
Host: localhost:8080
Content-Type: application/json
Cache-Control: no-cache
Postman-Token: 8afe6ef8-a4cd-fc9d-a6cc-b92766a56bd6

{"oldPassword":"actualPassword", "newPassword":"newOne"}