HTTP 405 error on validation failure on server side

Scenario is :

1. I have extra view and method in controler for forcing user to change password.
2. I don't want to send old encrypted password to view and creating ecripting function in javascript.
3. I want to take plain password form UPDATE form, encrypt and test it equals with old one in controller.
4. When password equals, I do "bindingResult.rejectValue("password"", "user_same_password")"
5. After return I get "HTTP Status 405 - JSPs only permit GET POST or HEAD" from tomcat without stacktrace.
6. When I use create form (use post method) everyting work as should.