出现下面的问题，搭建好是这样的不能建sessionBean
http://wenku.baidu.com/link?url=cIG-uNMOJyZogDyUcu4Rt7J0nphxCFN8AkvSsaj8hhRCLD9i1FrCimDqXqIoyfI5vzPEQs0b3sNvqGX3ILokAh0EdOIP1R_1i8CpYDuZzcW
