donotuseosvf Hibernate OpenSessionViewFilter 사용하지 않기 http://sonegy.wordpress.com/2014/05/13/jpa-opensessioninviewfilter-%EC%A0%81%EC%9A%A9%ED%95%98%EC%A7%80-%EC%95%8A%EA%B3%A0-%EA%B5%AC%ED%98%84%ED%95%98%EA%B8%B0/