HTTP Status 500 - Request processing failed; nested exception is org.hibernate.HibernateException: Could not obtain transaction-synchronized Session for current thread
http://www.cnblogs.com/javaleon/p/3978509.html
hibernate的session会话没有稳固,在配置文件中,有三种方式管理session,
managed managed 或者thread也可以jta,对应三种管理;
500是最不该出现的错误