在使用STRUTS標籤修改MYSQL裡面的資料時出現錯誤

錯誤碼：2011-2-26 11:06:22 org.apache.catalina.core.StandardWrapperValve invoke
嚴重: Servlet.service() for servlet action threw exception
org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1
 at org.hibernate.jdbc.Expectations$BasicExpectation.checkBatched(Expectations.java:61)
 at org.hibernate.jdbc.Expectations$BasicExpectation.verifyOutcome(Expectations.java:46)
 at org.hibernate.jdbc.BatchingBatcher.checkRowCounts(BatchingBatcher.java:68)
 at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:48)
 at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:246)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:237)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:142)
 at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
 at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
 at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
 at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
 at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
 at com.tfsoftware.www.DaoImpl.UserDaoImpl.updateUser(UserDaoImpl.java:148)
 at com.tfsoftware.www.action.UserActionTest.update(UserActionTest.java:154)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at com.tfsoftware.www.action.UserActionTest.execute(UserActionTest.java:88)
 at org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58)
 at org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67)
 at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
 at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
 at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
 at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
 at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
 at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
 at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at com.tfsoftware.www.fiter.EncodingFilter.doFilter(EncodingFilter.java:32)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
 at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
 at java.lang.Thread.run(Unknown Source)
資料庫也串連上了 增加和刪除都對著 只有修改是錯的，當點擊修改時出現修改頁面 但用struts標籤卻得不到 所要修改的值  並且點擊提交就報以上錯誤

 

這是所寫的修改類

public void updateUI(HttpServletRequest request, ActionForm form,
   UserDao userDao) throws GetException, IllegalAccessException,
   InvocationTargetException {
  String userIDStr = request.getParameter("userID");
  if(userIDStr != null){
   Integer userID = Integer.valueOf(userIDStr);
   UserForm userForm = (UserForm)form;
   User user = userDao.getUser(userID);
   BeanUtils.copyProperties(userForm, user);
  }
   List provs = new ArrayList();
         provs.add("山西省");
         provs.add("陝西省");
         provs.add("河北省");
         provs.add("山東省");
         provs.add("新疆省");
        
         request.setAttribute("provs", provs);
 }
 
 public void update(HttpServletRequest request, ActionForm form,
   UserDao userDao)
   throws IllegalAccessException, InvocationTargetException,
   UpdateException {
  UserForm userForm = (UserForm)form;
  User user = new User();
  BeanUtils.copyProperties(user,userForm);
        userDao.updateUser(user);
//  userDao.updateUserByID(5);
 }

所調用的修改實作類別是正確的   請問一下 怎麼解決 謝謝