How to override spring security message "Authentication method not supported: GET"?

In spring-security-code-3.1.0.RELEASE.jar->org/springframework/security/messages.properties there is no key to override this message.

Is there any other way to override this message?

I am only allowing server to authenticate using post method. But when I directly call /j\_spring\_security\_check using get message then server return above message.

Thanks in advance.