Sending private messages should use only POST (not GET) request

Steps to reproduce
Send GET request like

GET http://qa.jtalks.org/jcommune/pm?id=0&recipient=Check&title=Message+subject&body=Message+content&post=Send HTTP/1.1
Host: qa.jtalks.org
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:25.0) Gecko/20100101 Firefox/25.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
Accept-Language: ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://qa.jtalks.org/jcommune/pm/new?senderId=82
Cookie: JSESSIONID=91C0DCFCE96028B739EDD1AD7304765A; SPRING_SECURITY_REMEMBER_ME_COOKIE=dUZJaHJIKy9BZHgxR0lUQmg1a1JwQT09OllYTWZCRDkrSndLTHNwYlhTRUFIQVE9PQ; GMT=-120; org.springframework.web.servlet.i18n.CookieLocaleResolver.LOCALE=en
Connection: keep-alive

(correct request for private message sending but with GET type, not POST)

Actual result
Request succesfully handled

Expected result
Error like "405 Method Not Allowed" should be received