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)
[解决办法]
有意思， find(hql,userid,passwd2) 编译能通过？
public List find(String hql, Object... values) 这是何方神圣？
用这种方法:
List userList = getHibernateTemplate().find(hql,new Object[]{userid});
[解决办法]
悄悄说一句
那是JAVA5的可变参数列表
去GOOGLE一下吧
