Hibernate 插入成功了还报错？？？请教。。

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Hibernate: insert into name1.dbo.users (username, password) values (?, ?)
org.hibernate.TransactionException: Transaction not successfully started
 at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:100)
 at org.DoDao.hibernatee.qq(hibernatee.java:33)
 at org.DoDao.ww.main(ww.java:11)
Exception in thread "main" org.hibernate.SessionException: Session was already closed
 at org.hibernate.impl.SessionImpl.close(SessionImpl.java:275)
 at org.DoDao.hibernatee.qq(hibernatee.java:38)
 at org.DoDao.ww.main(ww.java:11)

事务没有成功开启