javax.servlet.ServletException: java.lang.NullPointerException
10:34:51,416 WARN RequestProcessor:528 - Unhandled Exception thrown: class java.lang.NullPointerException
2011-4-22 10:34:51 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet action threw exception
java.lang.NullPointerException
at com.Hibernate.util.HibernateUtil.findUser(HibernateUtil.java:41)
at com.struts.action.FindUserAction.finUser(FindUserAction.java:23)
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 org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:270)
at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:187)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
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.struts.filter.MyFilter.doFilter(MyFilter.java:24)
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:128)
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:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Unknown Source)
at com.struts.action.FindUserAction.finUser(FindUserAction.java:23)
public ActionForward finUser(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
throws Exception
{
UserForm uf = (UserForm) form;
String strUserName = request.getParameter("UserName");
String strPwd = request.getParameter("PWD");
List list = HibernateUtil.findUser(strUserName, strPwd);
request.getSession().setAttribute("list", list);
User user = new User();
if ((list != null) && (!(list.isEmpty()))) {
for (int i = 0; i < list.size(); ++i) {
user = (User)list.get(i);
String strUsername = user.getUserName();
String strUserPurview = user.getPurview();
String strUserbranch = user.getBranch();
uf.setUserName(strUsername);
uf.setUserPurview(strUserPurview);
uf.setUserbranch(strUserbranch);
request.getSession().setAttribute("uform", uf);
request.getSession().setAttribute("username", strUsername);
}
return new ActionForward("/findMenuAction.do?method=findMenu");
}
else
return new ActionForward("/unsuccess.jsp");
}
}
at com.Hibernate.util.HibernateUtil.findUser(HibernateUtil.java:41)
public static List findUser(String strUserName, String strPwd)
{
Transaction tx = null;
List list = null;
try {
session = hib.openSession();
tx = session.beginTransaction();
Query query = session.createQuery("from User as u where u.userName=:strUserName and u.pwd=:strPwd");
query.setString("strUserName", strUserName);
query.setString("strPwd", strPwd);
list = query.list();
tx.commit();
hib.closeSession(session);
} catch (Exception e) {
e.printStackTrace();
tx.rollback();
}
return list;
}
求各位大侠赐教,到底哪里出了问题。不胜感激啊~