Hibernate_exception

09:11:51,726  INFO org.hibernate.tool.hbm2ddl.SchemaExport:268 - schema export complete
org.hibernate.HibernateException: save is not valid without active transaction
at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:338)
at $Proxy7.save(Unknown Source)
at com.fbright.drp.item.dao.impl.ItemDaoImplMySql.addItem(ItemDaoImplMySql.java:13)
at com.fbright.drp.item.service.ItemManagerImpl.addItem(ItemManagerImpl.java:25)
at com.fbright.drp.user.web.action.AddItemAction.main(AddItemAction.java:17)
那里出了错误？
有怎么样修改？