JPetStore 报 com.ibatis.struts.BeanActionException 异常

运行JPetStore时报以下错误
  Error!
  com.ibatis.struts.BeanActionException
  Error dispatching bean action via URL pattern ('signon'). Cause: java.lang.reflect.InvocationTargetException
 
 
  Stack
  com.ibatis.struts.BeanActionException: Error dispatching bean action via URL pattern ('signon'). Cause: java.lang.reflect.InvocationTargetException
  Caused by: java.lang.reflect.InvocationTargetException
  at com.ibatis.struts.BeanAction.execute(BeanAction.java:140)
  at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
  at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
  at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
  at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
  at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
  at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
  at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
  at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
  at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
  at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
  at java.lang.Thread.run(Thread.java:595)
  Caused by: java.lang.reflect.InvocationTargetException
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:585)
  at com.ibatis.struts.BeanAction.execute(BeanAction.java:138)
  ... 21 more

------解决方法--------------------------------------------------------
什么版本的，是否配置不正确啊，我运行过，应该没有问题。
  数据库建了么？