新手使用find()问题求助。

我的代码：import java.util.List;import org.acegisecurity.providers.encoding.Md5PasswordEncoder;
import org.acegisecurity.providers.encoding.PasswordEncoder;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springside.core.dao.HibernateEntityDao;import com.my.security.model.User;
public class CustomerUser extends HibernateEntityDao<User>{
 final Log buzzLog = LogFactory.getLog(Constants.BUSINESS_LOG);
public int UserCheck(String userid, String passwd){
  buzzLog.info("--- Check Begin ---");
  int ret = 1;
  String hql;
  String passwd2;
  PasswordEncoder passwordEncoder = new Md5PasswordEncoder();
  passwd2 = passwordEncoder.encodePassword(passwd, null);
  hql = "from user u where number=? and passwd=?";
  try {
   buzzLog.info("---find begin ---\n" + hql);
   List userList = find(hql,userid,passwd2);
   if ( userList.size() > 0) {
    ret = 0;
    }
  }
  catch(Exception e){
   buzzLog.info("---find error ---");
   e.printStackTrace();
   ret = -1;
  }
  return ret;
 }
public List find(String hql, Object... values) {
Assert.hasText(hql);
return getHibernateTemplate().find(hql, values);
}
}
 执行时报错：2007-07-09 13:05:26,375 INFO [business] - <--- Check Begin --->
2007-07-09 13:05:26,421 INFO [business] - <---find begin ---
from ss_users u where number=? and passwd=?>
2007-07-09 13:05:26,421 INFO [business] - <---find error --->
java.lang.NullPointerException at org.springside.core.dao.HibernateGenericDao.find(HibernateGenericDao.java:159)
 at com.my.commons.CustomerUser.UserCheck(CustomerUser.java:34) <就是List userList = find(hql,userid,passwd2);>
 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 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: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.extremecomponents.table.filter.AbstractExportFilter.doFilter(AbstractExportFilter.java:49)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:173)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:78)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 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.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:856)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
 at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
 at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
 at java.lang.Thread.run(Thread.java:595)