用STRUTS做登陆界面，loginform代码如下！

package com.yourcompany.struts.action;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionErrors;

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 com.yourcompany.struts.form.LoginForm;

public class LoginAction extends Action {

public ActionForward execute(

ActionMapping mapping,

ActionForm form,

HttpServletRequest request,

HttpServletResponse response)throws Exception {

LoginForm actionForm = (LoginForm) form;

String empName=(actionForm).getUsername();

String empPassword=(actionForm).getPassword();

System.out.println("=========================================="+empName);

System.out.println("=========================================="+empPassword);

AbstractDbOperate db=(AbstractDbOperate) empdbFactory.getDbOperate();

IUser user=db.getUser(empName);

ActionMessages messages=new ActionMessages();

if(user==null){

ActionMessage am=new ActionMessage("loginAction.errors.username",empName);

messages.add("username",am);

saveErrors(request,(ActionErrors) messages);

return(mapping.findForward("errors"));

}

String dbPassword=user.getEmpPassword();

if(dbPassword==null||!dbPassword.equals(empPassword)){

ActionMessage am=new ActionMessage("LoginAction.errors.password");

messages.add("password",am);

saveErrors(request,(ActionErrors) messages);

return(mapping.findForward("errors"));

}

return(mapping.findForward("success"));

}

}

已经可以把数据从前台传到后台，但运行TOMCAT,输入username和password,登陆后出错：

==========================================1323123(username)

==========================================132(password)

org.apache.struts.action.RequestProcessor processException

警告: Unhandled Exception thrown: class java.lang.ClassCastException

问题补充：程序上小的错误可能性比较小，因为我改过好几处，但结果都一样！如果是小的错误，MYECLIPSE会提示的，帮我看下是不是逻辑判断上有误