紧急，大家帮帮忙unexpected token！！！！

异常如下：
2008-06-07 22:58:49,906 - org.hibernate.hql.PARSER -0    [http-8080-Processor23] ERROR org.hibernate.hql.PARSER  - *** ERROR: line 1:42: unexpected token: where
org.hibernate.hql.ast.QuerySyntaxError: unexpected token: where near line 1, column 42 [from com.stuman.domain.Teacher tea where where tea.name = 'feng' and tea.password = '1']
at org.hibernate.hql.ast.ErrorCounter.throwQueryException(ErrorCounter.java:63)
at org.hibernate.hql.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:215)
at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:127)
at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:83)
at org.hibernate.impl.SessionFactoryImpl.getQuery(SessionFactoryImpl.java:427)
at org.hibernate.impl.SessionImpl.getQueries(SessionImpl.java:884)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:834)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:74)
at com.stuman.web.struts.action.common.LoginAction.execute(LoginAction.java:64)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
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:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at com.stuman.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:62)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:595)
Caused by: line 1:42: unexpected token: where
at org.hibernate.hql.antlr.HqlBaseParser.negatedExpression(HqlBaseParser.java:2032)
at org.hibernate.hql.antlr.HqlBaseParser.logicalAndExpression(HqlBaseParser.java:1937)
at org.hibernate.hql.antlr.HqlBaseParser.logicalOrExpression(HqlBaseParser.java:1901)
at org.hibernate.hql.antlr.HqlBaseParser.expression(HqlBaseParser.java:1663)
at org.hibernate.hql.antlr.HqlBaseParser.logicalExpression(HqlBaseParser.java:1834)
at org.hibernate.hql.antlr.HqlBaseParser.whereClause(HqlBaseParser.java:376)
at org.hibernate.hql.antlr.HqlBaseParser.queryRule(HqlBaseParser.java:617)
at org.hibernate.hql.antlr.HqlBaseParser.selectStatement(HqlBaseParser.java:263)
at org.hibernate.hql.antlr.HqlBaseParser.statement(HqlBaseParser.java:150)
at org.hibernate.hql.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:209)
登陆模块：
import java.io.UnsupportedEncodingException;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import com.stuman.util.HibernateUtil;
import com.stuman.domain.Admin;
import com.stuman.domain.Student;
import com.stuman.domain.Teacher;
import com.stuman.web.struts.form.LoginForm;
public class LoginAction extends Action {
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws UnsupportedEncodingException {
HttpSession session = request.getSession();
Session s = HibernateUtil.currentSession();
LoginForm loginForm = (LoginForm) form;
String sort = loginForm.getSort();
String username = loginForm.getUsername();
String password = loginForm.getPassword();
int loginSort = Integer.parseInt(sort);
try {
HibernateUtil.beginTransaction();
String str = new String();
switch (loginSort) {
case 1:
str = "from Student as stu where stu.name=:stuNameandstu.password=:stuPassword";
Query qryStu = s.createQuery(str);
qryStu.setString("stuName", username);
qryStu.setString("stuPassword", password);
List stuList = qryStu.list();
HibernateUtil.commitTransaction();
if (stuList.size() > 0) {
session.setAttribute("studentid", ((Student)stuList.get(0))
.getId());
return mapping.findForward("studentLoginsuccess");
} else
break;
case 2:
str = "from Teacher tea where tea.name = '" + username 
        + "' and tea.password = '" + password + "'";
Query qryTea = s.createQuery(str);
List tealist = qryTea.list();
HibernateUtil.commitTransaction();
if (tealist.size() > 0) {
session.setAttribute("teacherid", ((Teacher) tealist.get(0))
.getId());
return mapping.findForward("teacherLoginsuccess");
} else
break;
case 3:
str = "from Admin admin where admin.name = '" + username
+ "' and admin.password = '" + password + "'";
Query qryAdmin = s.createQuery(str);
List adminlist = qryAdmin.list();
HibernateUtil.commitTransaction();
if (adminlist.size() > 0) {
session.setAttribute("adminid", ((Admin)adminlist.get(0)).getId());
return mapping.findForward("adminLoginsuccess");
} else
break;
default:
break;
}
} catch (HibernateException e) {
e.printStackTrace();
HibernateUtil.rollbackTransaction();
} finally {
HibernateUtil.closeSession();
} ActionMessages messages = new ActionMessages();
messages.add(ActionMessages.GLOBAL_MESSAGE, new ActionMessage(
"login.error"));
saveMessages(request, messages);
return mapping.findForward("ToErrorPage");
}}
admin和Student登陆都是可以的，只有teacher这个登陆不上去，而且是异常，总是提示登陆错误